Laser Components USA, Inc.
116 South River Road
Building C
Bedford, NH 03110
Phone: +1 603 821 7040


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PbS and PbSe Detectors

PbS is a standard SWIR semiconductor detector (1 - 3.3 µm) whereas PbSe is used in the MWIR range (1 - 4.7 µm when uncooled; up to 5.2 µm when cooled). Our lead salt detectors are photoconductive; the detector resistance is reduced during illumination. The crystal structure is polycrystalline and is produced via chemical deposition.

PbS Detector

PbS Detectors

Polycrystalline lead sulfide detectors (PbS) detect infrared radiation in the wavelength range between 1 µm and 3.3 µm.

PbS and PbSe Detectors

PbS detectors exhibit a higher sensitivity than PbSe detectors, by more than one order of magnitude; however, the time constant is longer. The IV-VI semiconductor PbS is a photodetector that reacts to incident IR radiation and changes its electrical resistance.

These detectors are used especially when large-area detectors are required because they are significantly less expensive than comparable InGaAs detectors. The typical chip size of LASER COMPONENTS’ standard detectors is 2 mm x 2 mm. Other configurations are also available upon request.

Application Fields:
The fields of application are manifold, examples of which include:

  • Temperature sensors – pyrometers
  • Flame and spark detectors
  • Moisture sensors
  • Measurement of coatings and oil films

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The standard size of detector elements in our lead sulfide series is 2 mm x 2 mm. Other sizes, as well as elements with Peltier cooling, are also available upon request.

Compared to InGaAs detectors, PbS elements, especially large-area designs, are available at a lower price and are thus still relevant.

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Your contact person

Susan Wells

+1 603 821 7040