Laser Components (UK) Ltd.
Goldlay House,
114 Parkway,
Chelmsford Essex CM2 7PR
United Kingdom
Phone: +44 1245 491 499


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Pyroelectric Detectors - Current Mode


The LASER COMPONENTS Pyro Group (LCPG) has experienced high demand for their in-house production of pyroelectric detectors, and a greater preference for current mode (CM) operation over voltage mode (VM). Most popular are lithium tantalite (LTO) dual channel pyros used in gas sensing by combining one active (chosen gas, e.g. CO2) and one reference (to normalise signals) in a single TO-package.

CM operation provides a higher responsivity, over voltage mode, with a low offset with a low temperature dependence. An op-amp is used in conjunction with a negative feedback loop. CM operation also provides a low electrical time constant and faster recovery times allowing one to use CM devices at much higher frequencies than VM devices with less signal loss.

Dual channel pyros in a TO-39 housing offer up to two sensors with an active area of up to 3.0 x 3.0 mm². They are available both with and without an additional blind element, which permits temperature fluctuation compensation (TFC), as well as higher internal amplification. Wherever reasonably possible, integrated microphonic reduction is included within the detector. A wide range of narrow band pass optical filters makes it possible to configure a suitable detector for nearly any application. CM pyrodetectors are particularly easy to integrate into systems. In fact it is almost identical to Plug&Play integration. The following product lines are available:

  • Two-channel detectors with filters - L12 and L22 series
  • Three-channel detectors with filters - L13 and L23 series
  • Four-channel detectors with filters - L14 and L24 series


Further product information:
LiTaO3 Multi Channel Detectors

Laser Components Pyro Group, Inc.


Contact Person:    Chris Varney
Company:    LASER COMPONENTS (UK) Ltd.
Address:    Goldlay House 114 Parkway
Postcode / City:    CM2 7PR Chelmsford Essex
Phone:    +44 1245 491499
Fax:    +44 1245 491801

pyroelectric detectors

Pyroelectric LTO detectors

Typical CM circuit: Equivalent circuit of a detector in current mode (CM)

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Your contact person

Kay Cable

+44 1245 491499