Create an Account  |   Log In

View All »Matching Part Numbers


Your Shopping Cart is Empty
         

Si Transimpedance Amplified Photodetectors


  • Six Models Cover Wavelengths from 200 - 1100 nm
  • Maximum Bandwidths up to 380 MHz 
  • Sensitivities Down to Femtowatt Powers
  • Switchable- and Fixed-Gain Versions

 

 

PDA36A

Switchable Gain

 

Detector with Ø1" Lens
Tube Attached to a 30 mm
Cage System

Power
Supply
Included

PDA015A

380 MHz Bandwidth

Related Items


Please Wait
Item # Wavelength Range Maximum Bandwidth Gain
(Hi-Z Load / 50 Ω Load)
NEP
Fixed Gain
PDA10A(-EC) 200 - 1100 nm 150 MHz 10 kV/A / 5 kV/A  35 pW/Hz1/2
PDA8A(/M) 320 - 1000 nm 50 MHz 100 kV/A / 50 kV/A  6.5 pW/Hz1/2
PDA015A(/M) 400 - 1000 nm 380 MHz 50 kV/A / 25 kV/A  36 pW/Hz1/2
Fixed Gain, Femtowatt Sensitivity
PDF10A(/M) 320 - 1100 nm 20 Hz 1x109 kV/A (Hi-Z)a 1.4x10-3 pW/Hz1/2
Switchable Gainb
PDA100A(-EC) 320 - 1100 nm 5.9 kHz - 2.4 MHz 1.51 kV/A - 4.75 MV/A /
0.75 kV/A - 2.38 MV/A
0.973 - 27 pW/Hz1/2
PDA36A(-EC) 350 - 1000 nm 5 kHz - 10 MHz 1.51 kV/A - 4.75 MV/A /
0.75 kV/A - 2.38 MV/A
0.593 - 29.1 pW/Hz1/2
  • Due to its 25 Hz cutoff frequency, operating the PDF10C(/M) with lower loading is not recommended.
  • Switchable with 8 x 10 dB steps. Bandwidth varies inversely with gain.
photo detector power supply
Click to Enlarge

The power supply is included with all of the detectors on this page and replacements are sold below.
Removable Internal SM1 Adapter
Click to Enlarge

Housings feature internal SM05 and external SM1 threads. An SM1T1 SM1 Adapter with internal threads is included with each amplified photodetector, and an SM1RR Retaining Ring is included with the PDA015A, PDA10A, PDA36A, and PDA100A.

Features

  • Wavelength Ranges within 200 to 1100 nm 
  • Low-Noise Amplification with Fixed or Switchable Gain 
  • Load Impedances 50 Ω and Higher for ≥5 kHz Bandwidth Versions
  • DC-Coupled Voltage Output: 0 to 10 V
  • Free-Space Optical Coupling, Accessories for Fiber Coupling Available Below
  • Compatible with SM1-Threaded and Some SM05-Threaded Products
  • Power Supply and SM1T1 Adapter Included 

Thorlabs' Silicon (Si) Transimpedance Amplified Photodetectors provide low-noise amplified signals from silicon photodetectors, which are sensitive to light in the wavelength region extending from the UV into the NIR. Our selection of PDA series amplified photodetectors are designed to meet a range of requirements, with offerings that include the 380 MHz PDA015A with an impulse response of 1 ns, the high-sensitivity PDF10A with a noise equivalent power (NEP) of 1.4 fW/Hz1/2, and the switchable-gain PDA100A with eight switchable maximum gain (bandwidth) combinations from 1.15 kV/A (2.4 MHz) to 4.75 MV/A (5.9 kHz).

The PDF10A with femtowatt sensitivity is a low-frequency device that should only be terminated into high impedance (Hi-Z) loads, while all other of our silicon amplified photodetectors are capable of driving loads from 50 Ω to Hi-Z. 

Each of Thorlabs' amplified photodetectors has a frequency response extending to DC. Switchable-gain versions include 8 gain settings, in which each gain setting also adjusts the maximum bandwidth. Bandwidth varies inversely with gain. Fixed-gain versions possess a fixed maximum bandwidth and total transimpedance gain. Across the PDA series, amplification is provided by either a low-noise transimpedance amplifier (TIA) or a low-noise TIA followed by a voltage amplifier. Signal output is via a BNC connector. 

Each unit's housing features 8-32 tapped holes (M4 for -EC and /M models) that enable the amplified photodetector to be vertically or horizontally post mounted. For more information about the location of these mounting points and mounting these units, please see the Housing Features and Mounting Options tabs. The housings also feature internal SM05 (0.535"-40) threading and external SM1 (1.035"-40) threading as shown in the image to the right. An SM1T1 internally SM1-threaded adapter is included with each detector. The PDA015A, PDA10A, PDA36A, and PDA100A also each include an SM1RR retaining ring. A TRE(/M) electrically isolated TR post adapter is included with the PDF10A.

Included with each amplified photodetector is a ±12 V power supply, which features a switch that is toggled to select for either 115 or 230 VAC input voltage. Always use the power switch on the housing or on the power supply to power on the amplified photodetector . Hot plugging is not recommended, as this may result in an oscillating or negative output signal. Thorlabs recommends centering the incident light on the active area of the photodetector and not overfilling the detector area. Failing to do so may result in undesirable capacitance and resistance effects, arising from inhomogeneities at the edges of the active area of the detector, that distort the frequency response.

The SM1 threading on the housing is ideally suited for mounting a Ø1" focusing lens or pinhole in front of the detector element. In addition, these photodetectors pair well with Thorlabs' passive low-pass filters, which have a 50 Ω input and a high-impedance output that allows them to be directly attached to high-impedance measurement devices such as an oscilloscope. Thorlabs offers a wide variety of BNC, BNC-to-SMA, and SMC cables, as well as a variety of BNC, SMA, and SMC adapters.

Performance Specifications

Item # Wavelength Bandwidth Rise Time Peak Responsivity Noise Equivalent Power
(NEP)a
Active Area Operating
Temperataure
Range
Fixed Gain
PDA10A 200 - 1100 nm DC - 150 MHz 2.3 ns 0.44 A/W @ 750 nm 35 pW/Hz1/2 0.8 mm(Ø1.0 mm) 10 to 50 °C
PDA8A 320 - 1000 nm DC - 50 MHz 7 ns 0.56 A/W @ 820 nm 6.5 pW/Hz1/2 0.5 mm(Ø0.8 mm) 10 to 50 °C
PDA015A 400 - 1000 nm DC - 380 MHz 1.0 ns 0.47 A/W @ 740 nm 36 pW/Hz1/2 0.07 mm(Ø150 µm) 10 to 40 °C
Fixed Gain, Femtowatt Sensitivity
PDF10A 320 - 1100 nm DC - 20 Hz 22 ms 0.6 A/W @ 960 nm 1.4x10-3 pW/Hz1/2 1.2 mm(1.1 mm x 1.1 mm) 18 to 28 °C
Switchable Gain
PDA100A 320 - 1100 nm DC - 2.4 MHzb N/Ac 0.62 A/W @ 960 nm 0.973 - 27 pW/Hz1/2 100 mm(10 mm x 10 mm) 10 to 40 °C
PDA36A 350 - 1100 nm DC - 10 MHzb N/Ac 0.65 A/W @ 970 nm 0.593 - 29.1 pW/Hz1/2 13 mm(3.6 mm x 3.6 mm) 0 to 40 °C
  • NEP is specified at the peak responsivity wavelength. As NEP changes with the gain setting for the switchable-gain versions, an NEP range is given for these.
  • This is the maximum possible bandwidth for these amplified photodetectors. Bandwidth varies as a function of gain. For more information see the Switchable Gain table below.
  • Rise times depend on the chosen gain level and wavelength. As one increases the gain of a given optical amplifier, the bandwidth is reduced, and hence, the rise time increases. Please refer to the photodiode tutorial for information on calculating the rise time. Bandwidth specifications for each switchable photodetector may be found in the table below.

Gain Specifications

Fixed Gain

Item # Gain w/ Hi-Z Load Gain w/ 50 Ω Load Output Voltage
w/ Hi-Z Load
Output Voltage
w/ 50 Ω Load
Fixed Gain
PDA10A 10 kV/A 5 kV/A 0 - 10 V 0 - 5 V
PDA8A 100 kV/A 50 kV/A 0 - 3.6 V 0 - 1.8 V
PDA015A 50 kV/A 25 kV/A 0 - 10 V 0 - 5 V
Fixed Gain, Femtowatt Sensitivity
PDF10Aa 1x109 kV/A - 0 - 10 V -
  • Due to its 25 Hz cutoff frequency, operating the PDF10C(/M) with less than high impedance loading is not recommended.

Switchable Gain

Item # Gain Step
(dB)
Gain
w/ Hi-Z Loada
Gain
w/ 50 Ω Loada
Bandwidth Noise
(RMS)
NEPb Offset Output Voltage
w/ Hi-Z Load
Output Voltage
w/ 50 Ω Load
PDA100A 0 1.51 kV/A 0.75 kV/A 2.4 MHz 254 µV 27 pW/Hz1/2 5 mV (10 mV Max) 0 - 10 V 0 - 5 V
10 4.75 kV/A 2.38 kV/A 1.6 MHz 261 µV 11 pW/Hz1/2 6 mV (12 mV Max)
20 15 kV/A 7.5 kV/A 860 kHz 349 µV 8.91 pW/Hz1/2 6 mV (15 mV Max)
30 47.5 kV/A 23.8 kV/A 480 kHz 561 µV 4.65 pW/Hz1/2 8 mV (15 mV Max)
40 150 kV/A 75 kV/A 225 kHz 799 µV 3.55 pW/Hz1/2 8 mV (15 mV Max)
50 475 kV/A 238 kV/A 78 kHz 998 µV 2.42 pW/Hz1/2 8 mV (15 mV Max)
60 1.5 MV/A 750 kV/A 20 kHz 1163 µV 1.22 pW/Hz1/2 8 mV (15 mV Max)
70 4.75 MV/A 2.38 MV/A 5.9 kHz 1490 µV 0.973 pW/Hz1/2 ± 30 mV
PDA36A 0 1.51 kV/A 0.75 kV/A 10.0 MHz 300 µV 29.1 pW/Hz1/2 3 mV (10 mV Max) 0 - 10 V 0 - 5 V
10 4.75 kV/A 2.38 kV/A 5.5 MHz 280 µV 7.52 pW/Hz1/2 4 mV (10 mV Max)
20 15 kV/A 7.5 kV/A 1.0 MHz 250 µV 2.34 pW/Hz1/2 4 mV (10 mV Max)
30 47.5 kV/A 23.8 kV/A 260 kHz 260 µV 1.21 pW/Hz1/2 4 mV (10 mV Max)
40 150 kV/A 75 kV/A 150 kHz 340 µV 0.593 pW/Hz1/2 4 mV (10 mV Max)
50 475 kV/A 238 kV/A 45 kHz 400 µV 0.794 pW/Hz1/2 4 mV (10 mV Max)
60 1.5 MV/A 750 kV/A 11 kHz 800 µV 1.43 pW/Hz1/2 5 mV (10 mV Max)
70 4.75 MV/A 2.38 MV/A 5 kHz 1.10 mV 2.10 pW/Hz1/2 6 mV (10 mV Max)
  • Gain figures can also be expressed in units of Ω.
  • The Noise Equivalent Power is specified at the peak wavelength.
Removable Internal SM1 Adapter
Click to Enlarge

Figure 2: Housings feature internal SM05 and external SM1 threads. An SM1T1 SM1 Adapter with internal threads is included with each amplified photodetector, and an SM1RR Retaining Ring is included with the PDA015A, PDA10A, PDA36A, and PDA100A.
PDA015 Top Connectors
Click to Enlarge

Figure 1: Connectors and LED Located at Top of Housing

As a convenience, the back panel of the PDA015A is engraved with the responsivity curve of the silicon photodiode. The equation written above the responsivity curve can be used to calculate the conversion gain (C.G.) for a given operating wavelength.

Housing Features of the PDA Series Amplified Si Photodetectors

Thorlabs' Amplified Photodiode series feature a slim design and many common elements. 

Connectors: The Power In connector, Output BNC connector, and power indicator LED are located at the top of the housing, as is shown in Figure 1.

SM1 and SM05 Threading: As shown in Figure 2, the housings feature external SM1 (1.035"-40) threading, and an SM1T1 internally SM1-threaded adapter is included with each detector. The PDA015A, PDA10A, PDA36A, and PDA100A each additionally include an SM1RR retaining ring. Most SM1-threaded fiber adapters are compatible with these detectors. Externally SM1-threaded adapters can be mated to the included internally SM1-threaded adapter, while internally SM1-threaded adapters can be mated directly to the housing. The S120-FC internally SM1-threaded fiber adapter is not compatible with these detectors.

The internal SM05 (0.535"-40) threading on the housing is suitable for mating to an externally threaded SM05 lens tube. Please note that other SM05 components, such as fiber adapters, cannot be threaded onto the SM05 threading.

8-32 (M4 for Metric Versions) Mounting Options: Threaded holes on the housing allow the unit to be mounted in a horizontal or vertical orientation, which gives the user the option to route the power and BNC cables from above or alongside the beam path. For more information on mounting these units, please see the Mounting Options tab.

PDA36A and PDA100A Switchable-Gain Amplified Photodetectors: Figure 3 shows the key housing features. Mounting points are located at the bottom and left side of the units, which are 8-32 threaded holes on the imperial and M4 threaded holes on the metric versions. The power switch and an eight-position rotary gain switch are located on the right side of the housing. The location of the gain switch enables easy access while the amplified detector is mounted.

PDA015A and PDA10A Fixed-Gain Amplified Photodetectors: Figure 4 shows the key housing features. Mounting points are located at the bottom and left side of the units, which are 8-32 threaded holes on the imperial and M4 threaded holes on the metric versions. The power switch is located on the right side of the housing.

PDA8A and PDF10A Fixed-Gain Amplified Photodetectors: Figure 5 shows the key housing features. Mounting holes, 8-32 for the imperial versions and M4 for the metric, feature surfaces flush with the housing and located on the right side beneath the power switch, on the left side, and on the bottom of the housing.  A TRE(/M) electrically isolated TR post adapter is included with the PDF10A. The power switch is located on the right side of the housing.

Switchable-Gain Amplified Detectors
PDA36A and PDA100A

PDF10A Power Switch and Gain Switch
Click to Enlarge

Figure 3: Power Switch, Gain Switch, and Mounting Options

Fixed-Gain Amplified Detectors
PDA015A and PDA10A

PDA015 Mounting Hole
Click to Enlarge

Figure 4: Power Switch and Mounting Options 

Fixed-Gain Amplified Detectors
PDA8A and PDF10A

PDF10A Mounting Hole
Click to Enlarge

Figure 5: Power Switch and Mounting Options

PDA Series Mounting Options

The PDA series of amplified photodetectors are compatible with our entire line of lens tubes, TR series posts, and cage mounting systems. Because of the wide range of mounting options, the best method for mounting the housing in a given optical setup is not always obvious. The pictures and text in this tab will discuss some of the common mounting solutions. As always, our technical support staff is available for individual consultation.

amplified photodetector amplified photodetector disassembled amplified photodetector close up
Picture of a PDA series photodetector as it will look when unpackaged. Picture of a DET series photodetector with the included SM1T1 and its retaining ring removed from the front of the housing. Thorlabs' PDA series photodetectors feature the same mounting options. A close up picture of the front of the PDA10A photodetector. The internal SM1 threading on the SM1T1 adapter and internal SM05 threading on the photodetector housing can be seen in this image.

TR Series Post (Ø1/2" Posts) System

The PDA housing can be mounted vertically or horizontally on a TR Series Post using the 8-32 (M4) threaded holes.

mounted amplified photodetector vertical mounted amplified photodetector horizontal
DET series photodetector mounted vertically on a TR series post. In this configuration, the output and power cables (PDA series) are oriented vertically and away from the optic table, facilitating a neater optical setup. PDA series photodetector mounted horizontally on a TR series post. In this configuration, the on/off switch is conveniently oriented on the top of the detector.

Lens Tube System

Each PDA housing includes a detachable Ø1" Optic Mount (SM1T1) that allows for Ø1" (Ø25.4 mm) optical components, such as optical filters and lenses, to be mounted along the axis perpendicular to the center of the photosensitive region. The maximum thickness of an optic that can be mounted in the SM1T1 is 0.1" (2.8 mm). For thicker Ø1" (Ø25.4 mm) optics or for any thickness of Ø0.5" (Ø12.7 mm) optics, remove the SM1T1 from the front of the detector and place (must be purchased separately) an SM1 or SM05 series lens tube, respectively, on the front of the detector.

The SM1 and SM05 threadings on the PDA photodetector housing make it compatible with our SM lens tube system and accessories. Two particularly useful accessories include the SM-threaded irises and the SM-compatible IR and visible alignment tools. Also available are fiber optic adapters for use with connectorized fibers.

Lens tube mounted amplified photodetector
DET series photodetector mounted onto an SM1L30C Ø1" Slotted Lens Tube, which is housing a focusing optic. The lens tube is attached to a 30 mm cage system via a CP02 SM1-Threaded 30 mm Cage Plate. This arrangement allows easy access for optic adjustment and signal alignment.

Cage System

The simplest method for attaching the PDA photodetector housing to a cage plate is to remove the SM1T1 that is attached to the front of the PDA when it is shipped. This will expose external SM1 threading that is deep enough to thread the photodetector directly to a CP02 30 mm cage plate. When the CP02 cage plate is tightened down onto the PDA photodetector housing, the cage plate will not necessarily be square with the detector. To fix this, back off the cage plate until it is square with the photodetector and then use the retaining ring included with the SM1T1 to lock the PDA photodetector into the desired location.

This method for attaching the PDA photodetector housing to a cage plate does not allow much freedom in determining the orientation of the photodetector; however, it has the benefit of not needing an adapter piece, and it allows the diode to be as close as possible to the cage plate, which can be important in setups where the light is divergent. As a side note, Thorlabs sells the SM05PD and SM1PD series of photodiodes that can be threaded into a cage plate so that the diode is flush with the front surface of the cage plate; however, the photodiode is unbiased.

For more freedom in choosing the orientation of the PDA photodetector housing when attaching it, a SM1T2 lens tube coupler can be purchased. In this configuration the SM1T1 is left on the detector and the SM1T2 is threaded into it. The exposed external SM1 threading is now deep enough to secure the detector to a CP02 cage plate in any orientation and lock it into place using one of the two locking rings on the ST1T2.

photodetector with cage plate

photodetector with cage plate

photodetector with cage plate and spacer

This picture shows a DET series photodetector attached to a CP02 cage plate after removing the SM1T1. The retaining ring from the SM1T1 was used to make the orientation of the detector square with the cage plate. These two pictures show a DET series photodetector in a horizontal configuration. The top picture shows the detector directly coupled to a CP02 cage plate.
The bottom picture shows a DET series photodetector attached to a CP02 cage plate using an SM1T2 adapter in addition to the SM1T1 that comes with the PDA series detector.

Although not pictured here, the PDA photodetector housing can be connected to a 16 mm cage system by purchasing an SM05T2. It can be used to connect the PDA photodetector housing to an SP02 cage plate.

Application

The image below shows a Michelson Interferometer built entirely from parts available from Thorlabs. This application demonstrates the ease with which an optical system can be constructed using our lens tube, TR series post, and cage systems. A PDA series photodetector is interchangeable with the DET series photodetector shown in the picture.

Michelson interferometer

The table below contains a part list for the Michelson Interferometer for use in the visible range. Follow the links to the pages for more information about the individual parts. 

Item # Quantity Description Item # Quantity Description
KC1 1 Mirror Mount CT1 1 1/2" Travel Translator
BB1-E02 2 Broadband Dielectric Laser Mirrors SM1D12 1 SM1 Threaded Lens Tube Iris
ER4 8 4" Cage Rods SM1L30C 1 SM1 3" Slotted Lens Tube
ER6 4 6" Cage Rods SM1V05 1 Ø1" Adjustable Length Lens Tube
CCM1-BS013 1 Cube-Mounted Beamsplitter CP08FP 1 30 mm Cage Plate for FiberPorts
BA2 1 Post Base (not shown in picture) PAF-X-5-A 1 FiberPort
TR2 1 Ø1/2" Post, 2" in Length P1-460B-FC-2 1 Single Mode Fiber Patch Cable
PH2 1 Ø1/2" Post Holder DET36A / PDA36A 1 Biased / Amplified Photodiode Detector

BNC Female 0 - 10 V Output (Photodetector)

BNC Female

0 - 10 V Output

PDA Male (Power Cables)

Pinout for PDA Power Cable

PDA Female Power IN (Photodetector)

Pinout for PDA Power Connector

Photodiode Tutorial

Theory of Operation

A junction photodiode is an intrinsic device that behaves similarly to an ordinary signal diode, but it generates a photocurrent when light is absorbed in the depleted region of the junction semiconductor. A photodiode is a fast, highly linear device that exhibits high quantum efficiency based upon the application and may be used in a variety of different applications.

It is necessary to be able to correctly determine the level of the output current to expect and the responsivity based upon the incident light. Depicted in Figure 1 is a junction photodiode model with basic discrete components to help visualize the main characteristics and gain a better understanding of the operation of Thorlabs' photodiodes.

Equation 1
Photodiode Circuit Diagram
Figure 1: Photodiode Model

Photodiode Terminology

Responsivity
The responsivity of a photodiode can be defined as a ratio of generated photocurrent (IPD) to the incident light power (P) at a given wavelength:

Equation 2

Modes of Operation (Photoconductive vs. Photovoltaic)
A photodiode can be operated in one of two modes: photoconductive (reverse bias) or photovoltaic (zero-bias). Mode selection depends upon the application's speed requirements and the amount of tolerable dark current (leakage current).

Photoconductive
In photoconductive mode, an external reverse bias is applied, which is the basis for our DET series detectors. The current measured through the circuit indicates illumination of the device; the measured output current is linearly proportional to the input optical power. Applying a reverse bias increases the width of the depletion junction producing an increased responsivity with a decrease in junction capacitance and produces a very linear response. Operating under these conditions does tend to produce a larger dark current, but this can be limited based upon the photodiode material. (Note: Our DET detectors are reverse biased and cannot be operated under a forward bias.)

Photovoltaic
In photovoltaic mode the photodiode is zero biased. The flow of current out of the device is restricted and a voltage builds up. This mode of operation exploits the photovoltaic effect, which is the basis for solar cells. The amount of dark current is kept at a minimum when operating in photovoltaic mode.

Dark Current
Dark current is leakage current that flows when a bias voltage is applied to a photodiode. When operating in a photoconductive mode, there tends to be a higher dark current that varies directly with temperature. Dark current approximately doubles for every 10 °C increase in temperature, and shunt resistance tends to double for every 6 °C rise. Of course, applying a higher bias will decrease the junction capacitance but will increase the amount of dark current present.

The dark current present is also affected by the photodiode material and the size of the active area. Silicon devices generally produce low dark current compared to germanium devices which have high dark currents. The table below lists several photodiode materials and their relative dark currents, speeds, sensitivity, and costs.

MaterialDark CurrentSpeedSpectral RangeCost
Silicon (Si) Low High Speed Visible to NIR Low
Germanium (Ge) High Low Speed NIR Low
Gallium Phosphide (GaP) Low High Speed UV to Visible Moderate
Indium Gallium Arsenide (InGaAs) Low High Speed NIR Moderate
Indium Arsenide Antimonide (InAsSb) High Low Speed NIR to MIR High
Extended Range Indium Gallium Arsenide (InGaAs) High High Speed NIR High
Mercury Cadmium Telluride (MCT, HgCdTe) High Low Speed NIR to MIR High

Junction Capacitance
Junction capacitance (Cj) is an important property of a photodiode as this can have a profound impact on the photodiode's bandwidth and response. It should be noted that larger diode areas encompass a greater junction volume with increased charge capacity. In a reverse bias application, the depletion width of the junction is increased, thus effectively reducing the junction capacitance and increasing the response speed.

Bandwidth and Response
A load resistor will react with the photodetector junction capacitance to limit the bandwidth. For best frequency response, a 50 Ω terminator should be used in conjunction with a 50 Ω coaxial cable. The bandwidth (fBW) and the rise time response (tr) can be approximated using the junction capacitance (Cj) and the load resistance (RLOAD):

Equation 3

Noise Equivalent Power
The noise equivalent power (NEP) is the generated RMS signal voltage generated when the signal to noise ratio is equal to one. This is useful, as the NEP determines the ability of the detector to detect low level light. In general, the NEP increases with the active area of the detector and is given by the following equation:

Photoconductor NEP

Here, S/N is the Signal to Noise Ratio, Δf is the Noise Bandwidth, and Incident Energy has units of W/cm2. For more information on NEP, please see Thorlabs' Noise Equivalent Power White Paper.

Terminating Resistance
A load resistance is used to convert the generated photocurrent into a voltage (VOUT) for viewing on an oscilloscope:

Equation 4

Depending on the type of the photodiode, load resistance can affect the response speed. For maximum bandwidth, we recommend using a 50 Ω coaxial cable with a 50 Ω terminating resistor at the opposite end of the cable. This will minimize ringing by matching the cable with its characteristic impedance. If bandwidth is not important, you may increase the amount of voltage for a given light level by increasing RLOAD. In an unmatched termination, the length of the coaxial cable can have a profound impact on the response, so it is recommended to keep the cable as short as possible.

Shunt Resistance
Shunt resistance represents the resistance of the zero-biased photodiode junction. An ideal photodiode will have an infinite shunt resistance, but actual values may range from the order of ten Ω to thousands of MΩ and is dependent on the photodiode material. For example, and InGaAs detector has a shunt resistance on the order of 10 MΩ while a Ge detector is in the kΩ range. This can significantly impact the noise current on the photodiode. For most applications, however, the high resistance produces little effect and can be ignored.

Series Resistance
Series resistance is the resistance of the semiconductor material, and this low resistance can generally be ignored. The series resistance arises from the contacts and the wire bonds of the photodiode and is used to mainly determine the linearity of the photodiode under zero bias conditions.

Common Operating Circuits

Reverse Biased DET Circuit
Figure 2: Reverse-Biased Circuit (DET Series Detectors)

The DET series detectors are modeled with the circuit depicted above. The detector is reverse biased to produce a linear response to the applied input light. The amount of photocurrent generated is based upon the incident light and wavelength and can be viewed on an oscilloscope by attaching a load resistance on the output. The function of the RC filter is to filter any high-frequency noise from the input supply that may contribute to a noisy output.

Reverse Biased DET Circuit
Figure 3: Amplified Detector Circuit

One can also use a photodetector with an amplifier for the purpose of achieving high gain. The user can choose whether to operate in Photovoltaic of Photoconductive modes. There are a few benefits of choosing this active circuit:

  • Photovoltaic mode: The circuit is held at zero volts across the photodiode, since point A is held at the same potential as point B by the operational amplifier. This eliminates the possibility of dark current.
  • Photoconductive mode: The photodiode is reversed biased, thus improving the bandwidth while lowering the junction capacitance. The gain of the detector is dependent on the feedback element (Rf). The bandwidth of the detector can be calculated using the following:

Equation 5

where GBP is the amplifier gain bandwidth product and CD is the sum of the junction capacitance and amplifier capacitance.

Effects of Chopping Frequency

The photoconductor signal will remain constant up to the time constant response limit. Many detectors, including PbS, PbSe, HgCdTe (MCT), and InAsSb, have a typical 1/f noise spectrum (i.e., the noise decreases as chopping frequency increases), which has a profound impact on the time constant at lower frequencies.

The detector will exhibit lower responsivity at lower chopping frequencies. Frequency response and detectivity are maximized for

Photoconductor Chopper Equation


Please Give Us Your Feedback
 
Email Feedback On
(Optional)
Contact Me:
Your email address will NOT be displayed.
 
 
Please type the following key into the field to submit this form:
Click Here if you can not read the security code.
This code is to prevent automated spamming of our site
Thank you for your understanding.
  
 
Would this product be useful to you?   Little Use  1234Very Useful

Enter Comments Below:
 
Characters remaining  8000   
Posted Comments:
Poster:jona.beysens
Posted Date:2017-01-18 09:19:54.95
Hi, We have a PDA10A in our laboratory in Belgium and we measure strange values. In the data sheet, it is mentioned that the output voltage of the photodiode is in the range 0V->10V. However, if we connect the output of the PDA10 directly to an oscilloscope, we measure values of -180mV when there is almost no light. Can you help us out with this problem? Best regards, Jona Beysens
Poster:tfrisch
Posted Date:2017-01-19 02:51:04.0
Hello Jona, thank you for contacting Thorlabs. I will reach out to you directly to troubleshoot your PDA10A.
Poster:brian.markey
Posted Date:2016-12-01 11:09:02.007
Your tutorial indicates that these Si photodetectors are highly linear. Can you quantify the linearity and dynamic range? i.e. how linear and over what range?
Poster:swick
Posted Date:2016-12-07 03:05:17.0
This is a response from Sebastian at Thorlabs. Thank you very much for your inquiry. The maximum output voltage swing of PDF10A is +10V. Saturation of the output will occur at optical input power greater than CW Saturation Power (16pW for PDF10A). Saturation of the Photodiode will cause nonlinear behavior. ND filters can be used to reduce the optical power and extend the operation range. The minimal detectable power, calculated from NEP at 960nm and SNR=1 , is 6fW. I have contacted you directly to provide further assistance.
Poster:Ludovic.BERNARD
Posted Date:2016-07-18 09:31:07.223
Hello, I'm using the PDA36A-EC to detect light pulses from 1 to 10 µs. I observe a charging time of 1.8 µs for the photodetector response signal and I was wondering if it was a normal value. If not can it come from the photodetector? Thank you.
Poster:jlow
Posted Date:2016-07-18 10:52:36.0
Response from Jeremy at Thorlabs: The rise time is going to be dependent on the gain setting that you choose. Also, if the detector is saturated, the rise time will be longer than usual as well. We will contact you directly to troubleshoot this.
Poster:kangsongbai83
Posted Date:2016-06-13 20:05:32.29
Hello,I have a PDA36A Si detector which does not work now. I wonder how to repair it? Should I just send it back to Thorlabs? I think it is under warranty but not very sure.
Poster:besembeson
Posted Date:2016-06-15 10:52:17.0
Response from Bweh at Thorlabs USA: I have contacted you directly.
Poster:goncharovv
Posted Date:2016-03-25 15:53:47.357
What is the maximum amount of optical power that the PDA36A and PDA100A can withstand before the damage occurs (not saturation).
Poster:besembeson
Posted Date:2016-03-25 05:01:36.0
Response from Bweh at Thorlabs USA: You should keep the power below 100mW to prevent damage. For typical use, under 1mW is recommended to keep the detector in the linear regime as these are amplified detectors.
Poster:liuhong_ayj
Posted Date:2015-03-31 16:39:31.477
I want to use PDA10A for detection of rapid fluorescence signals (60MHz)from organic dyes in cell membranes. this PDA10A can go to work?
Poster:jlow
Posted Date:2015-03-31 01:17:33.0
Response from Jeremy at Thorlabs: We will have to get more information about your application before being able to recommend a specific detector. I will contact you directly about this.
Poster:alaaeldin12
Posted Date:2014-10-16 15:17:43.007
Hello, I want to ask about the output of the PDA10A detector. What is the compatible power meter? Please contact me via email. Thank you.
Poster:jlow
Posted Date:2014-10-16 02:35:46.0
Response from Jeremy at Thorlabs: The PDA10A outputs a voltage signal but the detector's response is not NIST calibrated. We do offer power meter system which can be found at http://www.thorlabs.com/navigation.cfm?guide_id=37. I will contact you directly about our power meter system.
Poster:adavies78
Posted Date:2014-10-08 09:36:17.2
Is there any certification that the responsivity is linear across intensity range? i.e. is dV/dP the same for output in the 0-1V range as the 9-10?
Poster:jlow
Posted Date:2014-10-08 04:04:38.0
Response from Jeremy at Thorlabs: The response of the detector is linear for output below the maximum voltage (10V with Hi-Z load).
Poster:lesundak
Posted Date:2014-08-22 18:28:19.383
hello, I cannot obtain more than 0,45V output from my PDA8A. Under this value detector works good, but at 0,45V looks like it is saturated. What can be wrong? Thanks
Poster:shallwig
Posted Date:2014-08-26 07:38:27.0
This is a response from Stefan at Thorlabs. Thank you very much for your inquiry. I am sorry that you face problems with the PDA8A. I will contact you directly to troubleshoot this problem.
Poster:vkogotkov
Posted Date:2014-07-18 12:44:03.447
Dear Sirs, We would want to use one of your Amplified Photodetectors for detecting radiation of N2-laser. Beam characteristics: LengthxWidth-20x10mm, Pulse intensity-0,5 mJ, pulse duration-100ns. What Amp. Photodetector is best for our application? As I understand we'd need additional focusing and filtering components for this system... What can You advise?
Poster:jlow
Posted Date:2014-08-01 01:49:35.0
Response from Jeremy at Thorlabs: There are a few details missing from your setup description. We will contact you directly to discuss about this.
Poster:hha07
Posted Date:2014-03-28 17:31:22.757
The datasheet for the PDA8A/M specifies the output voltage for terminations of Hi-Z and 50 Ohm. I have an application where I'd like to connect the detector to a Mini-circuits mixer (tuf-3lh) which has an input impedance given by a coil connected to ground such that at DC the impedance is 0 Ohm. This will of course force the signal to 0 at DC. Will this damage the PDA8A/M detector by drawing to much current. What is the output impedance of the PDA8A/M and how is it connected, in series or in parallel? Regards, Hans Harhoff Andersen.
Poster:jvigroux
Posted Date:2014-04-14 05:01:57.0
A response from Julien at Thorlabs: Thank you for your inquiry! The connection to the coil will not damage the detector. This being said, one could of course use a coupling capacitance before the balun to achieve separation from the DC path. The output impedance is 47Ohms series.
Poster:paul.hamilton
Posted Date:2013-09-06 17:49:33.61
I'm having a hard time reproducing the numbers in the manual of the PDA36A for the NEP. I would have assumed that NEP = Noise_rms / Sqrt(BW) / Gain / Responsivity, but when I put in these numbers I get a NEP more than an order magnitude higher. Am I doing something incorrectly?
Poster:jlow
Posted Date:2013-09-11 14:38:00.0
Response from Jeremy at Thorlabs: You are correct that NEP = Vrms/(Gain*Responsivity*vbandwidth). The bandwidth used in the calculation is the bandwidth of the measuring system and not the bandwidth of the detector.
Poster:yuby2010
Posted Date:2013-08-28 14:19:19.92
There is a response curve in the Manual of PDA10A,but I can't find the detail spectrum response data, the responsivity of each wavelength. Would you please give me this?
Poster:sharrell
Posted Date:2013-08-29 16:35:00.0
Response from Sean at Thorlabs: Thank you for your feedback. I emailed you the data file directly, and we are in the process of adding the data for all of our Amplified Detectors directly to the website.
Poster:leon.islas
Posted Date:2013-05-09 13:33:28.323
I am planing on using this PDA for detection of rapid (msec) fluorescence signals from organic dyes in cell membranes but I am not sure that about the sensitivity. Do you have any experience with this type of measurement (voltage clamp fluorometry) or can recommend references?
Poster:jlow
Posted Date:2013-05-09 15:00:00.0
Response from Jeremy at Thorlabs: I will get in contact with you directly do discuss about the details in your experiments.
Poster:lixx1878
Posted Date:2013-04-05 12:09:53.973
I have a question about PDA36A. I plan to do photoluminescence experiment with it under low temperature (>77K). Does PDA36A work at that range? Do you have a responsitivity curve for that?
Poster:jlow
Posted Date:2013-04-08 09:52:00.0
Response from Jeremy at Thorlabs: The operating temperature for the PDA36A is 0-40°C.
Poster:adamaller
Posted Date:2013-03-27 05:19:04.92
Why the maximum incident light intensity is not indicated clearly, please?
Poster:cdaly
Posted Date:2013-04-02 16:04:00.0
Response from Chris at Thorlabs: Thank you for using our web feedback. The saturation point can be found by dividing the max voltage output for it's corresponding gain and responsivity. So for example with a 50Ohm resistance, the PDA8A can ouput up to 5V, dividing by 50kV/A and 0.5A/W (at peak responsivity), we end up with 64.3mW on the lowest gain setting. The same can be done for the other detectors as well. Each on the lowest settings, the PDA10A would be 2.22mW. The PDFF10A would be 2nW, the PDA36A and PDA100A would both be 10.3mW.
Poster:adavies78
Posted Date:2013-03-15 09:07:24.04
I have a DC sensing application where i use 4 PDA36A detectors at the highest gain setting. When I turn off the light source, there is a wide range of dark level--understandable for different chips. But some are negative. I don't understand why there would be negative dark signal unless an offset is built into the output...can you explain?
Poster:jlow
Posted Date:2013-03-18 14:35:00.0
Response from Jeremy at Thorlabs: The negative value that you see is the amplifier offset, which can be negative (for PDA36A, the offset should be within ±10mV at 70dB gain). For the recently purchased PDA36A (after July 2012), and PDA100A (after October 2012), there is a way to adjust the amplifier offset. If you remove the back cover of the PDA, there is a trimmer potentiometer which sets the offset. You can set the offset to what your desire value by covering up, and then adjusting the offset at 70dB gain setting.
Poster:sharrell
Posted Date:2012-12-06 15:58:00.0
Response from Sean at Thorlabs: Thank you for your feedback. For the PDA36A(-EC), the bandwidth at the 70 dB gain setting is 5 kHz. Complete specifications at each gain setting can be found on page 9 of the manual (http://www.thorlabs.com/Thorcat/13000/PDA36A-Manual.pdf). I have already updated the webpage to refer future customers to that location. We are in the process of developing a new website feature that will allow us to provide the complete set of specifications for detectors and other products in a more convinient way, and I will make sure that this page is one of the first to utilize the new feature.
Poster:graham.naylor
Posted Date:2012-12-06 15:17:45.83
What is the bandwidth at full gain - it is not clear from the web site and I have an inkling that you reduce the bandwidth at higher gain. thanks Graham
Poster:jjurado
Posted Date:2011-06-28 17:09:00.0
Response from Javier at Thorlabs to Veinardi.Suendo: Thank you very much for contacting us. Although it would be recommendable to place the FEL1200 filter at the input of the collimator, the structure of the setup you propose might work without the lens. The only concern is, of course, the space between the tip of the fiber and the lens. In principle, you could use the following path: Collimator-> Fiber-> SM1SMA Fiber Adapter-> Filter-> Detector. However, since the overall thickness of the filter is 6.3 mm, this added distance between the fiber and the active area of the detector, which is 1.1 mm x 1.1 mm, could cause some loss, since the output from the fiber will be divergent. You could perhaps use an aspheric lens pair to focus the output from the fiber onto the detector (link below), but this would add to the overall length and complexity of the setup. I will contact you directly to discuss this and other possibilities for your application. Aspheric lens pairs: http://thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=278 SM1SMA adapter: http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=69&pn=SM1SMA#3182
Poster:Veinardi.Suendo
Posted Date:2011-06-28 15:59:21.0
Dear Sirs, We planned to purchase your product (PDF10C/M) for our lab. in Indonesia. I believed that they have already launched the project. However, we need your assistance to connect this detector to optical fiber with SMA termination and a long wave pass filter (FEL1200). Would you mind telling us, which part is needed. Personally, I have in my mind this kind of setup: (collimator)--> (Optical Fiber)--> (fiber adapter)--> (SM1 tube)--> (lens?)--> (filter)--> (detector). Is it possible? Do we really need a lens in this case? Thank you very much for your assistance. Yours Sincerely, Dr. Veinardi Suendo Customer Email: Veinardi.Suendo@polytechnique.edu This customer would like to be contacted.
Poster:jjurado
Posted Date:2011-04-20 09:11:00.0
Response from Javier at Thorlabs to last poster: Thank you very much for your feedback. We have updated the Overview tab in order to clarify the different transimpedance specs for these detectors. Please do not hesitate to contact us at techsupport@thorlabs.com if you have any further questions or comments.
Poster:
Posted Date:2011-04-19 17:21:14.0
Transimpedance gain for the PDF10A is mentioned in the Overview tab, but the wording seems to indicate that both this and the PDF10C share a common gain value.

The following table lists Thorlabs' selection of photodiodes and photoconductive detectors. Item numbers in the same row contain the same detector element.

Photodetector Cross Reference
Wavelength Material Unmounted Photodiode Unmounted Photoconductor Mounted Photodiode Biased Detector Amplified Detector
150 - 550 nm GaP FGAP71 - SM05PD7A DET25K PDA25K
200 - 1100 nm Si FDS010 - SM05PD2A
SM05PD2B
DET10A PDA10A
Si - - SM1PD2A - -
320 - 1100 nm Si - - - - PDA8A
Si - - - - PDF10A
Si - - - - PDA100A
340 - 1100 nm Si FDS10X10 - - - -
350 - 1100 nm Si FDS100
FDS100-CAL a
- SM05PD1A
SM05PD1B
DET36A PDA36A
Si FDS1010
FDS1010-CAL a
- SM1PD1A
SM1PD1B
DET100A
400 - 1000 nm Si - - - - PDA015A
400 - 1100 nm Si FDS025 b
FDS02 c
- - DET02AFC
DET025AFC
DET025A
DET025AL
-
400 - 1700 nm Si & InGaAs DSD2 - - - -
500 - 1700 nm InGaAs - - DET10N - -
800 - 1700 nm InGaAs - - - - PDA015C
InGaAs FGA21
FGA21-CAL a
- SM05PD5A - PDA20C
PDA20CS
InGaAs FGA01 b
FGA01FC c
- - DET01CFC -
InGaAs FDGA05 - - - PDA10CF
InGaAs - - - DET08CFC
DET08C
DET08CL
PDF10C
InGaAs - - - DET20C -
800 - 1800 nm Ge FDG03
FDG03-CAL a
- SM05PD6A DET30B PDA30B
Ge FDG50 - - DET50B PDA50B
Ge FDG05 - - - -
800 - 2600 µm InGaAs FD05D - - DET05D -
FD10D - - DET10D -
900 - 1700 nm InGaAs FGA10 - SM05PD4A DET10C PDA10CS
1.0 - 2.9 µm PbS - FDPS3X3 - - PDA30G
1.0 - 5.8 µm InAsSb - - - - PDA10PT
1.2 - 2.6 µm InGaAs - - - - PDA10D
1.5 - 4.8 µm PbSe - FDPSE2X2 - - PDA20H
2.0 - 5.4 µm HgCdTe (MCT) - - - - PDA10JT
  • Calibrated Unmounted Photodiode
  • Unmounted TO-46 Can Photodiode
  • Unmounted TO-46 Can Photodiode with FC/PC Bulkhead

Si Amplified Photodetectors, Fixed Gain

Item # PDA10Aa PDA8Ab PDA015Aa
Click Image to Enlarge PDA10A PDA8A PDA015A
Wavelength Range 200 - 1100 nm 320 - 1000 nm 400 - 1000 nm
Bandwidth Range DC - 150 MHz DC - 50 MHz DC - 380 MHz
Rise Time 2.3 ns 7 ns 1.0 ns
Gain 10 kV/A (Hi-Z Load)
5 kV/A (50 Ω Load)
100 kV/A (Hi-Z Load)
50 kV/A (50 Ω Load)
50 kV/A (Hi-Z Load)
25 kV/A (50 Ω Load)
Noise-Equivalent Power (NEP) 35 pW/Hz1/2 6.5 pW/Hz1/2 36 pW/Hz1/2
Typical Performance Curves More Info More Info More Info
Active Area
(Click Blue Text
for Image) 
0.8 mm2
(Ø1.0 mm)
Image of Detector Element
0.5 mm2
(Ø0.8 mm)
Image of Detector Element
0.07 mm2
(Ø150 µm)
Image of Detector Element
Operating Temperature Range 10 to 50 °C 10 to 50 °C 10 to 40 °C
  • The PDA015A and PDA10A are shown with the included SM1T1 Internal SM1 Adapter and SM1RR Retaining Ring attached. The included LDS1212 power supply is not shown.
  • The PDA8A is shown with the included SM1T1 Internal SM1 Adapter attached. The included LDS1212 power supply is not shown.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
PDA10A Support Documentation
PDA10ASi Fixed Gain Detector, 200-1100 nm, 150 MHz BW, 0.8 mm2, 8-32 Taps
$303.00
Today
PDA8A Support Documentation
PDA8ASi Fixed Gain Detector, 320-1000 nm, 50 MHz BW, 0.5 mm2, 8-32 Taps
$408.00
Today
PDA015A Support Documentation
PDA015ANEW!Si Fixed Gain Detector, 400-1000 nm, 380 MHz BW, 0.07 mm2, 8-32 Taps
$895.00
Lead Time
+1 Qty Docs Part Number - Metric Price Available / Ships
PDA10A-EC Support Documentation
PDA10A-ECSi Fixed Gain Detector, 200-1100 nm, 150 MHz BW, 0.8 mm2, M4 Taps
$303.00
Today
PDA8A/M Support Documentation
PDA8A/MSi Fixed Gain Detector, 320-1000 nm, 50 MHz BW, 0.50 mm2, M4 Taps
$408.00
Today
PDA015A/M Support Documentation
PDA015A/MNEW!Si Fixed Gain Detector, 400-1000 nm, 380 MHz BW, 0.07 mm2, M4 Taps
$895.00
3-5 Days

Si Amplified Photodetector, Femtowatt Sensitivity and Fixed Gain

Item # PDF10A
Click Image to Enlargea PDF10A
Wavelength Range 320 - 1100 nm
Bandwidth Range DC - 20 Hz
Rise Time 22 ms
Gain 1x109 kV/A (Hi-Z Load)
Noise-Equivalent Power (NEP) 1.4x10-3 pW/Hz1/2
Responsivity Curve More Info
Active Area
(Click Blue Text
for Image)
1.2 mm2
(1.1 mm x 1.1 mm)
Image of Detector Element
Operating Temperature Range 18 to 28 °C
  • The photodetector is shown with the included SM1T1 Internal SM1 Adapter attached. The included LDS1212 power supply and TRE(/M) electrically isolated TR post adapter are not shown.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
PDF10A Support Documentation
PDF10ASi fW Sensitivity Fixed Gain Detector, 320-1100 nm, 20 Hz BW, 1.2 mm2, 8-32 Taps
$804.00
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
PDF10A/M Support Documentation
PDF10A/MSi fW Sensitivity Fixed Gain Detector, 320-1100 nm, 20 Hz BW, 1.2 mm2, M4 Taps
$804.00
Today

Si Amplified Photodetector, Switchable Gain

Item # PDA100Aa,b PDA36Aa
Click Image to Enlarge PDA100A PDA36A
Wavelength Range 320 - 1100 nm 350 - 1100 nm
Bandwidth Rangec DC - 2.4 MHz DC - 10 MHz
Gainc 1.51 kV/A - 4.75 MV/A (Hi-Z Load)
0.75 kVA - 2.38 MV/A (50 Ω Load)
1.51 kV/A - 4.75 MV/A (Hi-Z Load)
0.75 kVA - 2.38 MV/A (50 Ω Load)
Noise-Equivalent Power (NEP) 0.973 - 27 pW/Hz1/2 0.593 - 29.1 pW/Hz1/2
Responsivity Curve More Info More Info
Active Area
(Click Blue Text
for Image) 
100 mm2
(10 mm x 10 mm)
Image of Detector Element
13 mm2
(3.6 mm x 3.6 mm)
Image of Detector Element
Operating Temperature Range 10 to 40 °C 0 to 40 °C
  • The amplified photodetector is shown with the included SM1T1 Internal SM1 Adapter and SM1RR Retaining Ring attached. The included LDS1212 power supply is not shown.
  • The bandwidth and detection wavelength was improved in October 2012. PDA100A models purchased prior to that time will have a detection range of 400 - 1100 nm and a bandwidth of 1.5 MHz.
  • Switchable with 8 x 10 dB Steps. Bandwidth varies inversely with gain.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
PDA100A Support Documentation
PDA100ASi Switchable Gain Detector, 320-1100 nm, 2.4 MHz BW, 100 mm2, 8-32 Taps
$353.00
Today
PDA36A Support Documentation
PDA36ASi Switchable Gain Detector, 350-1100 nm, 10 MHz BW, 13 mm2, 8-32 Taps
$321.00
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
PDA100A-EC Support Documentation
PDA100A-ECSi Switchable Gain Detector, 320-1100 nm, 2.4 MHz BW, 100 mm2, M4 Taps
$353.00
Today
PDA36A-EC Support Documentation
PDA36A-ECSi Switchable Gain Detector, 350-1100 nm, 10 MHz BW, 13 mm2, M4 Taps
$321.00
Today

PDA Power Supply Cable

Pinout for Cable

The PDA-C-72 is a power cord for the PDA line of amplified photodetectors. The cord has tinned leads on one end and a PDA-compatible 3-pin connector on the other end. It can be used to power the PDA series of amplified photodetectors with any power supply that provides a DC voltage. The pin descriptions are shown to the right.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
PDA-C-72 Support Documentation
PDA-C-7272" PDA Power Supply Cable, 3-Pin Connector
$19.50
Today

12 VDC Regulated Power Supply

  • Replacement Power Supply for the Amplified Photodetectors Sold Above
  • ±12 VDC Power Output
  • Current Limit Enabling Short Circuit and Overload Protection
  • On/Off Switch with LED Indicator
  • Switchable AC Input Voltage (115 or 230 VAC)
  • 6.6 ft (2 m) Cable with LUMBERG RSMV3-657/2M Male Connector
  • UL and CE Compliant

The LDS1212 ±12 VDC Regulated Linear Power Supply is intended as a replacement for the supply that comes with our PDA line of amplified photodetectors sold on this page. The cord has three pins: one for ground, one for +12 V, and one for -12 V (see diagram above). This power supply ships with a location-specific power cord and the voltage switch is set to the proper setting for your location before it is shipped. This power supply can also be used with our PDB series of balanced photodetectors, our PMM series of photomultiplier modules, our APD series of avalanche photodetectors, and our dichroic atomic vapor spectroscopy systems.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
LDS1212 Support Documentation
LDS1212±12 VDC Regulated Linear Power Supply, 6 W, 115/230 VAC
$78.75
Today

Internally SM1-Threaded Fiber Adapters

These internally SM1-threaded (1.035"-40) adapters mate connectorized fiber to any of our externally SM1-threaded components, including our photodiode power sensors, our thermal power sensors, and our photodetectors. These adapters are compatible with the housing of the photodetectors on this page.

Item # S120-SMA S120-ST S120-SC S120-LC
Click Image to Enlarge S120-SMA S120-ST S120-SC S120-LC
Fiber Connector Typea SMA ST SC LC
Thread Internal SM1 (1.035"-40)
  • Other Connector Types Available upon Request
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
S120-SMA Support Documentation
S120-SMASMA Fiber Adapter Cap with Internal SM1 (1.035"-40) Thread
$39.00
Today
S120-ST Support Documentation
S120-STST/PC Fiber Adapter Cap with Internal SM1 (1.035"-40) Thread
$39.00
Today
S120-SC Support Documentation
S120-SCSC/PC Fiber Adapter Cap with Internal SM1 (1.035"-40) Thread
$49.00
Today
S120-LC Support Documentation
S120-LCLC/PC Fiber Adapter Cap with Internal SM1 (1.035"-40) Thread
$49.00
Today

Externally SM1-Threaded Fiber Adapters

Each disk has four dimples, two in the front surface and two in the back surface, that allow it to be tightened from either side with the SPW909 or SPW801 spanner wrench. The dimples do not go all the way through the disk so that the adapters can be used in light-tight applications when paired with SM1 lens tubes. Once the adapter is at the desired position, use an SM1RR retaining ring to secure it in place.

Item # SM1FC SM1FCAa SM1SMA SM1ST
Adapter Image
(Click the Image to Enlarge)
SM1FC SM1FCA SM1SMA SM1ST
Connector Type FC/PC FC/APC SMA ST/PC
Threading External SM1 (1.035"-40)
  • Please note that the SM1FCA has a mechanical angle of only 4°, even though the standard angle for these connectors is 8°. There is a 4° angle of deflection caused by the glass-air interface; when combined with the 4° mechanical angle, the output beam is aligned perpendicular to the adapter face.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SM1FC Support Documentation
SM1FCFC/PC Fiber Adapter Plate with External SM1 (1.035"-40) Thread
$29.00
Today
SM1FCA Support Documentation
SM1FCAFC/APC Fiber Adapter Plate with External SM1 (1.035"-40) Thread
$30.75
Today
SM1SMA Support Documentation
SM1SMASMA Fiber Adapter Plate with External SM1 (1.035"-40) Thread
$29.00
Today
SM1ST Support Documentation
SM1STST/PC Fiber Adapter Plate with External SM1 (1.035"-40) Thread
$29.00
Today
Log In  |   My Account  |   Contact Us  |   Careers  |   Privacy Policy  |   Home  |   FAQ  |   Site Index
Regional Websites: West Coast US | Europe | Asia | China | Japan
Copyright 1999-2017 Thorlabs, Inc.
Sales: 1-973-300-3000
Technical Support: 1-973-300-3000


High Quality Thorlabs Logo 1000px:Save this Image