LiTaO₃ Pyroelectric Detector

Wavelength Range from 0.6 µm to 16 µm
Flat Response Over Wavelength Range
Available in TO-39 Package

EPD13

LiTaO₃ Pyroelectric Detector, 0.6 - 16.0 μm, TO-39 Package

Application Idea

EPD13 Detector Shown in an S1LEDM LED Mount Attached to a Post with an LMR1 SM1-Threaded Optic Mount

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Overview
Specs
Example Circuit
Feedback
Cross Reference

Mounted and Unmounted Detectors
Photodiodes
Mounted Photodiodes (200 - 1800 nm)
Unmounted Photodiodes (200 - 2600 nm)
Pigtailed Photodiodes (320 - 1000 nm)
Calibrated Photodiodes (350 - 1800 nm)
Photovoltaic Detectors (2000 - 10 600 nm)
Thermopile Detectors (200 - 15 000 nm)
Pyroelectric Detector (600 - 16 000 nm)

Features

Wavelength Range: 0.6 µm to 16 µm
For Pulsed or Chopped Light Sources
Detector Active Area: 1.3 mm² (Ø1.3 mm)
Flat Response Over Entire Wavelength Range

Thorlabs' EPD13 Pyroelectric LiTaO₃ (Lithium Tantalate) Detector is designed for use with pulsed light signals between 0.6 µm and 16 µm. It is packaged in a TO-39 can with a ZnSe (zinc selenide) window.

Pyroelectric materials produce a voltage difference in response to a change in temperature. The EPD13 pyroelectric detector utilizes an LiTaO₃ (lithium tantalate) sensor coated with a black metal absorber. The metal absorber and LiTaO₃ sensor absorb the incident light causing a change in temperature and therefore a voltage difference. Since a change in temperature is required to produce a signal, the detector requires a modulated or pulsed light source. CW sources will not produce a signal once the detector reaches thermal equilibrium.

The lithium tantalate material has a generally flat response curve over the entire operating wavelength range, making the EPD13 detector useful for applications with broadband signals or with light from visible to MIR wavelengths. For more information on the ZnSe window transmission and the absorbance of the black metal coating and LiTaO₃ sensor, please see the performance graphs in the Specs tab. For an electrical circuit that is compatible with the EPD13 detector, please see the Example Circuit tab. An amplified version of this detector is also available.

Specification	Value
Detector	Pyroelectric Lithium Tantalate (LiTaO₃)
Wavelength Range	0.6 to 16 µm
Typical Absorption^a
Responsivity (500 K, 100 Hz, 25 °C)^b	120 V/W
Detector Active Area	1.3 mm² (Ø1.3 mm)
Detectivity (500 K, 100 Hz, 25 °C)^b	3.0x10⁸ (cm·Hz^1/2)/W
Noise Density (rms)	65 nV/(Hz^1/2)
Thermal Time Constant	50 ms
Package	TO-39
Window Material	ZnSe (0.8 mm Thick)
Typical Window Transmission^a
Acceptance Angle	130° (Typical)
Weight	1.5 g
Detector Surface Depth (Approximate)	1.6 mm (0.06")
Max Drain / Source Voltage	18 V
Operating Temperature	-25 to 60 °C
Storage Temperature	-25 to 60 °C

Click for Plot
This value is measured without the ZnSe window; therefore, the transmission of the window must be taken into account when calculating the value for a given wavelength.

Figure 3.1 shows an example of an electrical circuit to support the EPD13 pyroelectric detector. The detector is represented by the blue shaded box, with its three pins corresponding to drain, source, and ground/case labeled.

Figure 3.1 Example Circuit for EPD13 Detector

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

Photodetector Cross Reference
Wavelength	Material	Unmounted Detectors	Mounted Photodiode	Biased Detector	Amplified Detector	Amplified Detector, OEM Package
200 - 1100 nm	Si	FDS010	SM05PD2A SM05PD2B	DET10A2	PDA10A2	PDAPC5
200 - 1100 nm	Si	-	SM1PD2A	-	-	-
240 - 1170 nm	Black Si	FDBS11	SM05PD9A	-	-	-
	Black Si	FDBS22	SM05PD8A	DET20X2	PDA20X2	PDAPC10
	Black Si	FDBS25	-	-	-	-
320 - 1000 nm	Si	-	-	-	PDA8A2	-
320 - 1100 nm	Si	FD11A	SM05PD3A	-	PDF10A2	-
320 - 1100 nm	Si	-^a	-	DET100A2	PDA100A2	PDAPC2^a
340 - 1100 nm	Si	FDS10X10	-	-	-	-
350 - 1100 nm	Si	FDS100 FDS100-CAL^b	SM05PD1A SM05PD1B	DET36A2	PDA36A2	PDAPC1
350 - 1100 nm	Si	FDS1010 FDS1010-CAL^b	SM1PD1A SM1PD1B	-	-	-
400 - 1000 nm	Si	-	-	-	PDA015A2 FPD310-FS-VIS FPD310-FC-VIS FPD510-FC-VIS FPD510-FS-VIS FPD610-FC-VIS FPD610-FS-VIS	-
400 - 1100 nm	Si	FDS015^c	-	-	-	-
400 - 1100 nm	Si	FDS025^c FDS02^d	-	DET02AFC(/M) DET025AFC(/M) DET025A(/M) DET025AL(/M)	-	-
400 - 1700 nm	Si & InGaAs	DSD2	-	-	-	-
500 - 1700 nm	InGaAs	-	-	DET10N2	-	-
0.6 - 16 µm	LiTaO₃	EPD13^e	-	-	PDA13L2^e	-
750 - 1650 nm	InGaAs	-	-	-	PDA8GS	-
800 - 1700 nm	InGaAs	FGA015	-	-	PDA015C2	-
	InGaAs	FGA21 FGA21-CAL^b	SM05PD5A	DET20C2	PDA20C2 PDA20CS2	-
	InGaAs	FGA01^c FGA01FC^d	-	DET01CFC(/M)	-	-
	InGaAs	FDGA05^c	-	-	PDA05CF2	PDAPC6
	InGaAs	-	-	DET08CFC(/M) DET08C(/M) DET08CL(/M)	-	-
	InGaAs	-	-	-	PDF10C2	-
800 - 1800 nm	Ge	FDG03 FDG03-CAL^b	SM05PD6A	DET30B2	PDA30B2	-
	Ge	FDG50	-	DET50B2	PDA50B2	PDAPC8
	Ge	FDG05	-	-	-	-
900 - 1700 nm	InGaAs	FGA10	SM05PD4A	DET10C2	PDA10CS2	-
900 - 2600 nm	InGaAs	FD05D	-	DET05D2	-	-
900 - 2600 nm	InGaAs	FD10D	-	DET10D2	PDA10D2	PDAPC7
950 - 1650 nm	InGaAs	-	-	-	FPD310-FC-NIR FPD310-FS-NIR FPD510-FC-NIR FPD510-FS-NIR FPD610-FC-NIR FPD610-FS-NIR	-
1.0 - 5.8 µm	InAsSb	-	-	-	PDA10PT(-EC)	-
2.0 - 8.0 µm	HgCdTe (MCT)	VML8T0^f VML8T4^f,g	-	-	PDAVJ8^f	-
2.0 - 10.6 µm	HgCdTe (MCT)	VML10T0^f VML10T4^f,g	-	-	PDAVJ10^f	-
2.7 - 5.0 µm	HgCdTe (MCT)	VL5T0^f	-	-	PDAVJ5^f	-
2.7 - 5.3 µm	InAsSb	-	-	-	PDA07P2	PDAPC9

If you are interested in purchasing the bare photodiode incorporated in these detectors without the printed circuit board, please contact Tech Support .
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Photovoltaic Detector
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