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OEM Thermal Optical Power Detectors, Unmounted and Mounted


  • Surface-Mount-Device (SMD), PCB-Mounted, and Aluminum-Plate-Mounted Options
  • Devices have Square or Round Active Areas from 4.0 mm2 to 324 mm2
  • Position-Sensitive Devices on PCB or Aluminum Plate
  • Ideal for OEM and Custom Systems

TD10X

Unmounted SMD Package

Absorber
on Front

Solderable Copper
on Back

TD15A

Mounted on Aluminum Plate

TD2X

Unmounted SMD

TD2XP

PCB-Mounted TD2X

TD4HR18XP

PCB-Mounted Position Detector
with Four Sensors in Quadrant Configuration

Related Items


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Mounted and Unmounted Detectors
Unmounted Photodiodes (150 - 2600 nm)
Calibrated Photodiodes (350 - 1800 nm)
Mounted Photodiodes (150 - 1800 nm)
Thermopile Detectors (0.2 - 15 µm)
Photoconductors (1 - 4.8 µm)
Photovoltaic Detectors (2.0 - 10.6 µm)
Pigtailed Photodiodes (320 - 1000 nm)

Volume Pricing & OEM Support

Thorlabs is ready to supply these thermal power detectors in high volumes, and we pass the savings associated with planned production on to our customers.

Contact our OEM team to learn more. An OEM specialist will contact you within 24 hours or on the next business day.

Volume Pricing Discount
Contact Thorlabs

Click to Enlarge

Click Here for Raw Data
These detectors provide uniform absorbance from the UV into the MIR.

Features

  • Thermopile-Based Sensors
  • Nearly Flat Response from the UV into the MIR
  • Unmounted Detectors Have Solderable Copper Back Layer for Mounting
  • Sensors Available Mounted to a PCB or Aluminum Plate
  • Position Detectors Feature Four Thermally- and Mechanically-Integrated Sensors with Separate Electrical Connections
  • Volume Pricing Available

These Thermal Optical Power Detectors include unmounted and mounted single-thermopile sensors, as well as mounted position detectors comprising four individual thermopile sensors that are mechanically integrated into a quadrant configuration. The advantage of these thermal detectors over photodiodes is that the thermal detectors have a spectrally flat response over a broad wavelength range that extends from the UV through the MIR. Additionally, the thermal detectors have negligible dependency on the angle of incidence.

The three unmounted, single-thermopile thermal detectors have sensors optimized for high sensitivity and offer considerable flexibility in both mounting and making electrical connections. All have backing layers of solderable copper that facilitates mounting them on a PCB. Each unmounted sensor is also available mounted on a PCB, which provides mechanical stabilization and convenient copper solder pads for making electrical connections. The TD2XP's PCB has through-contacts and ground layers, while the TD4XP and TD10XP are mounted on metal-core PCBs and include an integrated thermistor.

The TD15A has a sensor that has been designed to accept higher input power levels, which enables its maximum optical power working range to extend up to 50 W. Its Ø15.0 mm sensor is mounted on an aluminum plate to assist with heat dissipation and also includes copper solder pads.

The four thermopile sensors composing the active area of the position detectors are mechanically integrated so that heat from the incident beam flows across the entire active area. As the heat intensity in each quadrant depends on the position of the incident beam, the position of the beam can be determined by comparing the magnitudes of the voltage signals from each quadrant. Position detectors are available mounted on a PCB or an aluminum plate. The sensor of the TD4HR18XP is optimized for high sensitivity and is mounted on a metal-core PCB, while the sensor of the TD4HP18XA is compatible with higher power levels and is mounted on an aluminum plate for enhanced heat dissipation.

Mounting and Handling
As a thermal gradient across the sensor is required to generate the voltage signal, it is crucial that the back side of the thermal detector is mounted to an appropriate heat sink. Active or passive cooling is required to maintain the temperature of the detector's back side at approximately room temperature throughout the measurement. Please see the Handling Instructions manual for more information. This manual also describes proper handling and cleaning methods.

Axial Thermopile Configuration
Click to Enlarge

Figure 1: A thermal sensor with axially configured thermocouples, which is depicted as seen from the side. Light is incident on the top, and heat flows down through the thermocouple layer and dissipates in the heat sink below.

Operational Principle

These unmounted and mounted thermal power detectors are based on thermopiles. The top layer of the sensor, which appears gray in color, consists of a light-absorbing material. Located immediately behind the sensor, and in thermal contact with it, is a layer containing multiple thermocouples. Thermocouples are made by bringing two dissimilar metals into contact, and their point of contact is called a junction. The other side of the thermocouple layer must be thermally coupled to a heat sink. The thermocouples are connected in series, and the placement of the junctions alternates from being in close proximity to the absorber to being in close proximity to the heat sink. This axial (or matrix) configuration of thermocouples is diagrammed in Figure 1.

The absorber converts incident light energy into heat. The heat flows from the absorber, across the thermocouples, and to the heat sink, where it dissipates. The temperatures of the thermocouple junctions placed close to the absorber are higher than the adjacent junctions placed close to the heat sink. This arrangement takes advantage of the thermoelectric (Seebeck) effect, in which a temperature difference between adjacent junctions generates a proportional voltage difference. By connecting multiple thermocouples in series, the magnitude of the generated voltage is increased.

Axially-configured sensors, including those used in these unmounted and mounted thermal power detectors, can achieve high resolutions in the microwatt range while providing relatively fast response times. These sensors detect optical powers up to several Watts, which is limited mostly by the thickness of the absorbing material.

Mounting the Detector to a Heat sink

Thermal detectors must be both mechanically stabilized and mounted on an appropriate heat sink, which dissipates heat from the absorbed incident laser light. To ensure sufficient cooling of the detector, choose a heat sink with high thermal conductivity and follow the thermal integration instructions in Chapter 2 of the Handling Instructions manual. Mounting methods include thermally conductive tape, thermally conductive glue, and soldering. After the thermal detector is mechanically stabilized and mounted to its heat sink, electrical connections can be made to the detector.

Unmounted Thermal Detectors
If the thermal detector is unmounted, and the chosen heat sink cannot provide adequate mechanical stabilization, the detector must first be mounted on a substrate that can provide both the necessary mechanical stabilization and good thermal coupling to the heat sink. After the detector is mounted onto the substrate, the substrate should then be mounted onto an appropriate heat sink.

If the chosen heat sink can provide adequate mechanical stabilization, an unmounted thermal detector can be mounted directly onto the heat sink. 

Mounted Thermal Detectors
When the thermal detector is mounted on a PCB or other substrate that provides adequate mechanical stabilization but inadequate heat dissipation, the substrate should be mounted onto an appropriate heat sink. This applies to all of these mounted detectors, including the thermal position detectors.

Natural Responses, the Sensor Time Constant, and Power Measurement Predictions

Natural Response of the S415C
Click to Enlarge

Figure 2: Natural response of the S415C with the dotted line at 99% and the red square indicating the point on the curve corresponding to a single sensor time constant.

The typical natural response of a thermal sensor is its measured response to being instantaneously and steadily illuminated after being held in total darkness. This step function illumination stimulus produces a measured response that can be modeled using an exponential function and is similar to the function describing the rate at which a capacitor charges. Figure 2 shows the natural response measured for our S415C thermal power detector. (The S415C is mounted to a heat sink, calibrated, and includes a C-Series Connector that allows it to be used with our power meter consoles.) 

The sensor time constant is defined in terms of how long it takes for the sensor response to reach 99% of its maximum response. The definition used by Thorlabs' power meter consoles is that when the sensor has reached the 99% level, a time period equal to five sensor time constants has elapsed. In Figure 2, the dotted line corresponds to the 99% level and the red square to the response after a single sensor time constant has elapsed. When the sensor's natural response characteristic function is known, it is possible to use it to model and predict the final power reading well before the sensor reading has stabilized. 

Protect Thermal Power Sensors from Thermal Disturbances

For the most accurate results, thermal power sensors should be protected from air flow and other thermal disturbances during operation. Otherwise, measurements will drift. This is of particular importance for low power sensors with high resolution. Handheld use is not recommended for any of the thermal power sensors, as body heat transferred to the sensor or heat sink can negatively impact the accuracy of the measurements.


Posted Comments:
user  (posted 2018-09-21 09:19:42.33)
TD2X mechanical documents fail to download
nreusch  (posted 2018-09-25 11:15:58.0)
This is a response from Nicola at Thorlabs. Thank you for making us aware of this. We will fix this immediately.
mrtimpovey  (posted 2018-06-20 10:24:44.987)
Do you offer any sample services on these products?
Nicola  (posted 2018-06-21 11:50:00.0)
This is a response from Nicola at Thorlabs: Thank you very much for your inquiry. These unmounted thermal detectors are designed for OEM applications and especially for integration in space-limited setups. We look forward to discuss your specific requirements in order to choose the detector that is best suited for your requirements.

Unmounted Thermal Detectors

  • Each is Also Available Mounted to a PCB (See Below)
  • Back Layer of Solderable Copper Facilitates Mounting to PCB
  • Operation Requires Mounting to an Appropriate Heat Sink
  • Smallest Thermopile Detectors Offered by Thorlabs

The compact sizes of these unmounted thermal detectors makes them particularly suitable for integration into setups where space is constrained. Mechanical and electrical integration methods can be chosen based on the needs of the application, provided that adequate cooling is provided. The bottom layer of solderable copper is convenient for attaching these detectors to a heat sink, and the copper solder pads on the TD4X and TD10X facilitate making electrical connections.


Item # TD2X TD4X TD10X
Sensor Image
(Click the Image to Enlarge)
TD2X TD4X TD10X
Wavelength Range 200 nm - 15 µm
Optical Power Working Rangea 100 µW - 500 mW 100 µW - 1 W 100 µW - 5 W 
Active Sensor Area
2.0 mm x 2.0 mm
(0.08" x 0.08")
4.4 mm x 4.4 mm
(0.17" x 0.17")
10.0 mm x 10.0 mm
(0.39" x 0.39")
Max Average Power Densityb 1.5 kW/cm²
Max Pulse Energy Density 0.3 J/cm2 (1 ns Pulse), 5 J/cm2 (1 ms Pulse)
Detector Type Thermopile
Typical Responsivity >100 mV/W
Linearity with Optical Power ±0.2%
Rise Timec 1.5 s 1.1 s
Active Area Uniformity ±1% (>1 mm Beam Diameter)
Detector Dimensions 2.0 mm x 2.0 mm x 0.5 mm 
(0.08" x 0.08" x 0.02")
4.4 mm x 7.4 mm x 0.6 mm
(0.17" x 0.28" x 0.02")
10.0 mm x 13.0 mm x 0.6 mm
(0.39" x 0.51" x 0.02")
Mountinga SMD Solder Pads SMD Solder Pads or Thermally Conductive Adhesive
Electrical Connection Copper Solder Pads on Back Side PCB, Wire
  • Mounting on an appropriate heat sink is required. For mounting instructions and other information, see the Handling Instructions manual.
  • Damage Threshold
  • Typical Natural Response Time (0 - 95%)
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
TD2X Support Documentation
TD2XUnmounted Thermal Power Detector, 0.2 - 15 µm, 0.5 W, 2.0 mm x 2.0 mm
$111.00
Volume Pricing
3-5 Days
TD4X Support Documentation
TD4XUnmounted Thermal Power Detector, 0.2 - 15 µm, 1 W, 4.4 mm x 4.4 mm
$228.00
Volume Pricing
Today
TD10X Support Documentation
TD10XUnmounted Thermal Power Detector, 0.2 - 15 µm, 5 W, 10.0 mm x 10.0 mm
$327.00
Volume Pricing
Today

Mounted Thermal Detectors

  • PCB-Mounted TD2X, TD4X, or TD10X (Available Unmounted Above)
    • High Sensitivity for Power Measurements Down to 100 µW
    • Integrated Thermistor in TD4X and TD10X Versions
    • Two Ø3.3 mm Mounting Holes
  • High-Power Detector Mounted on Aluminum Plate
    • Ø15.0 mm Active Area
    • Fast 0.6 s Rise Time
    • Four 1.6 mm Radius Quarter-Hole Mounting Points

These mounted thermal detectors include a thermopile-based sensor mounted on either a PCB or aluminum plate. Each includes solder terminals for electrical connections and mechanical features for mounting the devices to a heat sink. Their compact size is a benefit for applications where space is limited. The TD2XP features a high-sensitivity sensor, and it is mounted on a PCB with through-contacts and ground layers. The TD4XP and TD10XP also feature high-sensitivity sensors, and they are mounted on metal-core PCBs that include thermistors. The high-power sensor used in the TD15A is compatible with incident optical powers up to 50 W, assuming an appropriate heat sink is used, and the aluminum mounting plate assists with thermal management.


Item #a TD2XP TD4XP TD10XP TD15A
Sensor Image
(Click the Image to Enlarge)
TD2XP TD4XP TD10XP TD15A
Wavelength Range 200 nm - 15 µm
Optical Power Working Rangea 100 µW - 500 mW 100 µW - 1 W 100 µW - 5 W  1 mW - 50 W
Active Sensor Area
2.0 mm x 2.0 mm
(0.08" x 0.08")
4.4 mm x 4.4 mm
(0.17" x 0.17")
10.0 mm x 10.0 mm
(0.39" x 0.39")
Ø15.0 mm
(Ø0.59")
Item # of Mounted Sensor TD2X TD4X TD10X N/A
Max Average Power Densityb 1.5 kW/cm²
Max Pulse Energy Density 0.3 J/cm2 (1 ns Pulse), 5 J/cm2 (1 ms Pulse)
Detector Type Thermopile
Typical Responsivity >100 mV/W 1 mV/W
Linearity with Optical Power ±0.2%
Rise Timec 1.5 s 1.1 s 0.6 s
Active Area Uniformity ±1% (>1 mm Beam Diameter)
Temperature Sensor N/A NTC Thermistor, 10 kΩ N/A
Detector Dimensions 18.0 mm x 11.0 mm x 1.6 mm 
(0.71" x 0.43" x 0.06")
18.0 mm x 12.0 mm x 2.6 mm
(0.71" x 0.47" x 0.11")
26.0 mm x 16.0 mm x 2.6 mm
(1.02" x 0.63" x 0.10")
15.0 mm x 19.0 mm x 1.5 mm
(0.59" x 0.75" x 0.06")
Substrate PCB Aluminum Plate
Mountinga Two Ø3.3 mm (Ø0.13")
Mounting Holes
Two Ø3.3 mm (Ø0.13")
Mounting Holes
Two Ø3.3 mm (Ø0.13")
Mounting Holes
Four 1.6 mm (0.06") Radius
Quarter-Hole Mounting Points
Electrical Connection Wire
  • Mounting on an appropriate heat sink is required. For mounting instructions and other information, see the Handling Instructions manual.
  • Damage Threshold
  • Typical Natural Response Time (0 - 95%)
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
TD2XP Support Documentation
TD2XPPCB-Mounted Thermal Power Detector, 0.2 - 15 µm, 0.5 W, 2.0 mm x 2.0 mm
$122.00
Volume Pricing
Today
TD4XP Support Documentation
TD4XPPCB-Mounted Thermal Power Detector, 0.2 - 15 µm, 1 W, 4.4 mm x 4.4 mm
$277.00
Volume Pricing
Today
TD10XP Support Documentation
TD10XPPCB-Mounted Thermal Power Detector, 0.2 - 15 µm, 5 W, 10.0 mm x 10.0 mm
$372.00
Volume Pricing
Today
TD15A Support Documentation
TD15AAl-Plate-Mounted Thermal Power Detector, 0.2 - 15 µm, 50 W, Ø15 mm
$311.00
Volume Pricing
Today

Mounted Thermal Position Detectors

  • Active Area Comprises Four Thermally-Coupled Square Sensors in Quadrant Configuration
  • Each Sensor is an Electrically Independent Thermopile with Its Own Solder Terminals
  • High-Resolution, PCB-Mounted Option Provides 30 µm Spatial Resolution
  • High-Power, Aluminum-Plate-Mounted Option
    • Optical Power Working Range up to 50 W
    • Fast 0.25 s Rise Time 

The mechanical integration and electrical separation of the four constituent thermopile-based sensors forms a position sensitive device (PSD); heat is free to flow across the entire active area, but the signal from each quadrant measures the response in only that quadrant's thermopile. When the beam spot of the optical input is contained in one quadrant, the output signal from this quadrant will be higher than the output signals of the other three quadrants. If the beam spot moves across the active area towards the center of the PSD, the signals from the four quadrants will become more similar. The X and Y position of the beam is determined by comparing the signal intensities of all four quadrants.

The TD4HR18P features a high-resolution sensor mounted on a metal-core PCB, which has four Ø3.4 mm mounting holes. The TD4HP18XA's high-power sensor is mounted on an aluminum plate, which assists with thermal management and has four 1.6 mm radius mounting points.


Item #a TD4HR18XP TD4HP18XA
Sensor Image
(Click the Image to Enlarge)
TD4HR18XP TD4HP18XA
Wavelength Range 200 nm - 15 µm
Optical Power Working Rangea 100 µW - 5 W 1 mW - 50 W
Spatial Resolution 30 µm 50 µm
Active Sensor Area
18.0 mm x 18.0 mm (0.71" x 0.71")
Max Average Power Densityb 1.5 kW/cm²
Max Pulse Energy Density 0.3 J/cm2 (1 ns Pulse), 5 J/cm2 (1 ms Pulse)
Detector Type Four Thermopiles in Quadrant Configuration
Min Responsivity, Each Quadrant 80 mV/W 0.5 mV/W
Linearity with Optical Power ±0.2%
Rise Timec 1.1 s 0.25 s
Active Area Uniformity ±1% (>1 mm Beam Diameter)
Detector Dimensions 35.0 mm x 35.0 mm x 1.6 mm 
(1.38" x 1.38" x 0.06")
28.0 mm x 18.0 mm x 1.5 mm
(1.10" x 0.71" x 0.06")
Substrate PCB Aluminum Plate
Mountinga Four Ø3.4 mm (Ø0.13")
Mounting Holes
Four 1.6 mm (0.06") Radius
Quarter-Hole Mounting Points
Electrical Connection Wire
  • Mounting on an appropriate heat sink is required. For mounting instructions and other information, see the Handling Instructions manual.
  • Damage Threshold
  • Typical Natural Response Time (0 - 95%)
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
TD4HR18XP Support Documentation
TD4HR18XPPCB-Mounted Thermal Position Detector, 0.2 - 15 µm, 5 W, 30 µm Resolution
$732.00
Volume Pricing
Today
TD4HP18XA Support Documentation
TD4HP18XAAl-Plate-Mounted Thermal Position Detector, 0.2 - 15 µm, 50 W, 50 µm Resolution
$555.00
Volume Pricing
Today
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