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Si Transimpedance Amplified Photodetectors


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Si Transimpedance Amplified Photodetectors

Features

  • Five Models Cover the 200 to 1100 nm Wavelength Range
  • Low-Noise, Wide Band Amplifiers
  • Fixed and Switchable Gain Modules
  • PDF10A Sensitive Down to Femtowatt Powers
  • 0 to 10 V Output
  • Compatible with SM1-Threaded and Some SM05-Threaded Products
  • Linear Power Supply Included

Thorlabs' Si Transimpedance Amplified Photodetectors, which consist of a photodiode and amplifier in a compact, low-profile package, are sensitive to light in the UV to NIR spectral region from 200 nm to 1100 nm. The slim profile housing enables use in light paths with space constraints. All connections and controls are located perpendicular to the light path, providing increased accessibility. Amplification is provided by low-noise transimpedance or voltage amplifiers that are capable of driving 50 Ω loads. Signal output is via a BNC connector. Thorlabs offers a wide variety of BNC, BNC-to-SMA, and SMC cables, as well as a variety of BNC, SMA, and SMC adapters.

Each housing provides two 8-32 tapped holes (M4 for -EC models) centered on the detector surface for vertical or horizontal post mounting. The housings also feature external SM1 (1.035"-40) threading and internal SM05 (0.535"-40) threading that are compatible with most Thorlabs SM1 and SM05 accessories. Additionally, an internally threaded SM1 coupler is included with each detector. This allows convenient mounting of SM1-compatible accessories, optics, and cage assembly accessories. The internal SM05 threading is only suitable for mating to an externally threaded SM05 lens tube (components such as fiber adapters cannot be threaded onto the SM05 threading). SM1-threaded fiber adapters may be used with any of these detectors. Externally SM1-threaded adapters should be mated to the included internally SM1-threaded adapter, while internally SM1-threaded adapters can be mated directly to the housing. A 120 VAC AC/DC linear power supply is included (230 VAC for -EC models).

Due to limitations in the IC, the high-speed amplifier used in these devices may become unstable, exhibiting oscillations or negative output if the linear power supply voltage is applied when the module is on. The unit should always be powered up using the power switch on the power supply or the unit itself. Hot plugging the unit is not recommended. Additionally, inhomogeneities at the edges of the active area of the detector can generate unwanted capacitance and resistance effects that distort the time-domain response of the photodetector output. Thorlabs therefore recommends that the incident light on the photodetector is well centered on the active area. The SM1 threading on the housing is ideally suited for mounting a Ø1" focusing lens or pinhole in front of the detector element.

Performance Specifications

SensorItem #Active
Area
WavelengthPeak
Response
BandwidthNEP Rangea
(W/Hz½)
Rise Timeb
Si
(VIS-NIR)
PDA10A0.8 mm2
(Ø1.0 mm)
200 - 1100 nm0.45 A/W
@ 750 nm
DC - 150 MHz5.5 x 10-112.3 ns
PDA8A0.5 mm2
(Ø0.8 mm)
320 - 1000 nm0.56 A/W
@ 820 nm
DC - 50 MHz6.5 x 10-127 ns
PDA36A13 mm2
(3.6 x 3.6 mm)
350 - 1100 nm0.65 A/W
@ 970 nm
DC - 10 MHz2.1 x 10-12 -
7.7 x 10-11
20.6 ns
PDA100A75.4 mm2
(Ø9.8 mm)
340 - 1100 nm0.65 A/W
@ 970 nm
DC - 2.4 MHz2.1 x 10-12 -
6.0 x 10-11
233.3 ns
PDF10A1.2 mm2
(1.1 x 1.1 mm)
320 - 1100 nm0.6 A/W
@ 960 nm
DC - 20 Hz1.4 x 10-1522 ms
  • A NEP range is given for the switch gain detectors, a max NEP is given for the fixed gain detectors.
  • Please note that 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. The rise time is specified at the peak responsivity wavelength.

Gain Specifications

Fixed Gain
Photodetector
Gain TypeGain w/ Hi-Z LoadGain w/ 50 Ω LoadOutput Voltage
w/ Hi-Z Load
Output Voltage
w/ 50 Ω Load
PDA10AFixed10 kV/A5 kV/A0 - 10 V0 - 5 V
PDA8AFixed100 kV/A50 kV/A0 - 3.6 V0 - 1.8 V
 
Switchable Gain
Photodetectora
Gain Step
(dB)
Gain w/ Hi-Z LoadGain w/ 50 Ω LoadOutput Voltage
w/ Hi-Z Load
Output Voltage
w/ 50 Ω Load
PDA36A & PDA100A01.5 kV/A0.75 kV/A0 - 10 V
0 - 5 V
104.75 kV/A2.38 kV/A
2015 kV/A7.5 kV/A
3047.5 kV/A23.8 kV/A
40150 kV/A75 kV/A
50475 kV/A238 kV/A
601.5 MV/A750 kV/A
704.75 MV/A2.38 MV/A
  • Complete specifications at each gain step are listed on page 9 of the manual for each item, which may be downloaded by clicking the document icon next to the item number below.
    Note: Gain figures can also be expressed in units of Ω.
PDA Series Compact Design
PDA Series Design

Compact PDA & PDF Series Design

Thorlabs' Amplified Photodiode series features a slim design, which allows the detector access to the light path even between closely spaced optical elements.

The power supply input and the BNC output are located on the same outer edge of the package, further reducing the device thickness and allowing easier integration into tight optic arrangements. The PDA and PDF series detectors can fit into spaces as thin as 0.83" (21.1 mm) when the SM1 coupler is removed. With the SM1 coupler attached, the smallest width the detector can fit into is 1.03" (26.2 mm).

Additionally, the detectors have two tapped mounting holes perpendicular to each other so that the unit can be mounted in a horizontal or vertical orientation. This dual mounting feature offsets the fact that the cables protrude out the side of the package, thus requiring more free space above or alongside your beam path.

The switchable gain detectors feature an eight-position rotary gain switch (pictured below right) mounted on an outside edge perpendicular to the power supply and BNC output connections. The location of the gain switch allows for easy adjustments while the detector is mounted.

PDA detector Bottom and Side view

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 photodetectoramplified photodetector disassembledamplified 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 verticalmounted 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 #QuantityDescriptionItem #QuantityDescription
KC11Mirror MountCT111/2" Travel Translator
BB1-E022Broadband Dielectric Laser MirrorsSM1D121SM1 Threaded Lens Tube Iris
ER484" Cage RodsSM1L30C1SM1 3" Slotted Lens Tube
ER646" Cage RodsSM1V051Ø1" Adjustable Length Lens Tube
CM1-BS0131Cube-Mounted BeamsplitterCP08FP130 mm Cage Plate for FiberPorts
BA21Post Base (not shown in picture)PAF-X-5-A1FiberPort
TR21Ø1/2" Post, 2" in LengthP1-460B-FC-21Single Mode Fiber Patch Cable
PH21Ø1/2" Post HolderDET36A / PDA36A1Biased / Amplified Photodiode Detector

BNC Female Output

BNC Female

0 - 10 V Output

PDA-C-72 Power Supply

Pinout for PDA Power Connector

The following table lists the photodiodes found on this page, along with the mounted photodiodes and packaged detectors which use the same internal photodiode.

 Photodetector Cross Reference
WavelengthMaterialUnmounted PhotodiodeUnmounted PhotoconductorMounted PhotodiodeBiased DetectorAmplified Detector
150 - 550 nmGaPFGAP71-SM05PD7ADET25KPDA25K
200 - 1100 nmSiFDS010-SM05PD2A
SM05PD2B
DET10APDA10A
200 - 1100 nmSi--SM1PD2A--
320 - 1100 nmSi----PDA8A
320 - 1100 nmSi----PDF10A
340 - 1100 nmSiFDS10X10----
350 - 1100 nmSiFDS100
FDS100-CAL a
-SM05PD1A
SM05PD1B
DET36APDA36A
400 - 1100 nmSiFDS025 b
FDS02 c
--
DET02AFC
DET025AFC
DET025A
DET025AL
-
400 - 1100 nmSiFDS1010
FDS1010-CAL a
-SM1PD1A
SM1PD1B
DET100APDA100A
400 - 1700 nmSi & InGaAsDSD2----
500 - 1700 nmInGaAs--DET10N--
700 - 1800 nmInGaAsFDGA05---PDA10CF
700 - 2700 µmInGaAsFGA20----
800 - 1700 nmInGaAs----PDF10C
800 - 1800 nmInGaAsFDGA05----
800 - 1800 nmInGaAsFGA10-SM05PD4ADET10CPDA10CS
800 - 1800 nmInGaAsFGA21
FGA21-CAL a
-SM05PD5ADET20CPDA20C
PDA20CS
800 - 1800 nmGeFDG03
FDG03-CAL a
-SM05PD6ADET30BPDA30B
800 - 1800 nmGeFDG50----
800 - 1800 nmGeFDG05
FDG05-CAL a
--DET50BPDA50B
800 - 1800 nmGeFDG1010-SM1PD5A--
850 - 1700 nmInGaAs---DET08CFC
DET08C
DET08CL
-
900 - 1700 nmInGaAsFGA01 b
FGA01FC c
--DET01CFC-
1.0 - 2.9 µmPbS-FDPS3X3--PDA30G
1.2 - 2.6 µmInGaAs---DET10DPDA10D
1.5 - 4.8 µmPbSe-FDPSE2X2--PDA20H
  • Calibrated Unmounted Photodiode
  • Unmounted TO-46 Can Photodiode
  • Unmounted TO-46 Can Photodiode with FC/PC Bulkhead
  •  

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 CurrentSpeedSensitivityaCost
Silicon (Si)LowHigh Speed400 - 1000 nmLow
Germanium (Ge)HighLow Speed900 - 1600 nmLow
Gallium Phosphide (GaP)LowHigh Speed150 - 550 nmModerate
Indium Gallium Arsenide (InGaAs)LowHigh Speed800 - 1800 nmModerate
Indium Arsenide Antimonide (InAsSb)HighLow Speed1000 - 5800 nmHigh
Extended Range Indium Gallium Arsenide (InGaAs)HighHigh Speed1200 - 2600 nmHigh
Mercury Cadmium Telluride (MCT, HgCdTe)HighLow Speed2000 - 5400 nmHigh
  • Approximate

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

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 ofphotocurrent 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

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Posted Comments:
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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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.
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Si Transimpedence Amplified Photodetectors
Item #PDA10APDA8APDA36APDA100Aa
Click Image to Enlarge PDA10A PDA8A PDA36A PDA100A
Element Photo Si Si Si Si
Wavelength Range 200 - 1100 nm 320 - 1000 nm 350 - 1100 nm 340 - 1100 nm
Responsivity Curve More Info More Info More Info More Info
Detector Size Ø1.0 mm Ø0.8 mm 3.6 mm x 3.6 mm Ø9.8 mm
Gain Fixed: 10 kV/A with Hi-Z Load
5 kV/A with 50 Ω Load
Fixed: 100 kV/A with Hi-Z Load
50 kV/A with 50 Ω Load
8 x 10 dB Steps 8 x 10 dB Steps
Bandwidth Range DC - 150 MHz DC - 50 MHz DC - 10 MHz DC - 2.4 MHz
NEP (W/Hz1/2) 5.5 x 10-11 6.5 x 10-12 2.1 x 10-12 - 7.7 x 10-11 2.1 x 10-12 - 6.0 x 10-11
  • 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.
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PDA10A Support Documentation
PDA10A Si Fixed Gain Detector, 200-1100 nm, 150 MHz BW, 0.78 mm2,
120 VAC
$288.66
Today
PDA8A Support Documentation
PDA8A Si Fixed Gain Detector, 320-1000 nm, 50 MHz BW, 0.50 mm2,
120 VAC
$612.00
Today
PDA36A Support Documentation
PDA36A Si Switchable Gain Detector, 350-1100 nm, 10 MHz BW, 13 mm2,
120 VAC
$304.98
Today
PDA100A Support Documentation
PDA100A Si Switchable Gain Detector, 340-1100 nm, 2.4 MHz BW, 75 mm2,
120 VAC
$335.58
Today
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PDA10A-EC Support Documentation
PDA10A-EC Si Fixed Gain Detector, 200-1100 nm, 150 MHz BW, 0.78 mm2,
230 VAC
$288.66
Today
PDA8A/M Support Documentation
PDA8A/M Si Fixed Gain Detector, 320-1000 nm, 50 MHz BW, 0.50 mm2,
230 VAC
$612.00
Today
PDA36A-EC Support Documentation
PDA36A-EC Si Switchable Gain Detector, 350-1100 nm, 10 MHz BW, 13 mm2,
230 VAC
$304.98
Today
PDA100A-EC Support Documentation
PDA100A-EC Si Switchable Gain Detector, 340-1100 nm, 2.4 MHz BW, 75 mm2,
230 VAC
$335.58
Today
Si Transimpedence Amplified Photodetector, Femtowatt Sensitivity
Item # PDF10A
Click Image to Enlarge PDF10A
Element Photo Si
Wavelength Range 320 - 1100 nm
Responsivity Curve More Info
Detector Size 1.1 mm x 1.1 mm
Gain Fixed: 1 x 109 kV/A
Bandwidth Range DC - 20 Hz
NEP (W/Hz1/2) 1.4 x 10-15
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PDF10A Support Documentation
PDF10A Si Amplified Detector, 320-1100 nm, 20 Hz BW, 1.2 mm2, 100-120 VAC
$765.00
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PDF10A/M Support Documentation
PDF10A/M Si Amplified Detector, 320-1100 nm, 20 Hz BW, 1.2 mm2, 220-240 VAC
$765.00
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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.

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PDA-C-72 Support Documentation
PDA-C-72 72" PDA Power Supply Cable, 3-Pin Connector
$18.50
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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.

Please contact Tech Support if you are unsure if the adapter is mechanically compatible.

Item #S120-FCS120-SMAS120-STS120-SCS120-LC
Click Image to Enlarge S120-FC S120-SMA S120-ST S120-SC S120-LC
Fiber Connector Typea FC/PCb SMA ST SC LC
Thread Internal SM1 (1.035"-40)
  • Other Connector Types Available upon Request
  • In certain angle-independent applications, this adapter may also be used with FC/APC connectors.
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S120-FC Support Documentation
S120-FC FC/PC Fiber Adapter Cap with Internal SM1 (1.035"-40) Thread
$38.00
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S120-SMA Support Documentation
S120-SMA SMA Fiber Adapter Cap with Internal SM1 (1.035"-40) Thread
$38.00
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S120-ST Support Documentation
S120-ST ST/PC Fiber Adapter Cap with Internal SM1 (1.035"-40) Thread
$38.00
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S120-SC Support Documentation
S120-SC SC/PC Fiber Adapter Cap with Internal SM1 (1.035"-40) Thread
$48.00
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S120-LC Support Documentation
S120-LC LC/PC Fiber Adapter Cap with Internal SM1 (1.035"-40) Thread
$48.00
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