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InAs 900 - 3500 nm

The IA35 series photodiodes based on heterostructures were specially designed for operation at room temperature.

The IA35 series is a spectral addition to the IG26 series of extended InGaAs photodiodes. IA35 detectors are photovoltaic, and the active area has a diameter of 500 µm.

IA35S500S4i is a high-quality yet affordable component. Compared to InAs products by traditional manufacturers of IR detectors, it offers double shunt resistance at a simultaneously quadrupled area.

Main Applications:

  • Non-contact temperature measurement
  • Laser monitoring
  • Spectrophotometer

Key Features:

  • Peak sensitivity: ≥1.05 A/W
  • Typical spectral range at 80% of peak sensitivity: approx. 900 nm to approx. 3500 nm
  • Shunt resistance: typically 700 ohms

    Our IR Detectors

    Panchromatic, photoconductive and thermal detectors

    InGaAs PIN Photodiodes

    Modern InGaAs PIN photodiodes are panchromatic and convert broadband light to photocurrents in the Vis-NIR range. Concretely speaking, this means a sensitivity range from 500 nm to 1700 nm for regular InGaAs and – in increments – up to 2600 nm for extended InGaAs. Variations for data transmission are not panchromatic.


    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.

    Pyroelectric IR Detectors

    A pyroelectric IR detector is a thermal detector in that it responds to the change in heat (IR) absorbed on its surface. Thermal detectors are polychromatic with a very wide spectral bandwidth.

    The nature of the pyroelectric effect is that in a highly-ordered crystal (or ceramic), a temperature change in the element causes its atoms to move slightly out of position. This rearranges its electrical charge, which is measured in the electrodes on its surface.

    The pyroelectric effect is found in many materials.  The most commonly-used materials are deuterated lanthanum α alanine-doped triglycine sulfate (DLaTGS) and lithium tantalate (LTO).

    Uwe Asmus
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    Uwe Asmus
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    Harvey Washbrook
    Laser Components Nordic AB
    41263 Göteborg - Sweden
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