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A laser warning receiver is a warning system used as a passive military defence. It detects, analyzes, and locates directions of laser emissions[1] from laser guidance systems and laser rangefinders. Then it alerts the crew and can start various countermeasures, like smoke screen, aerosol screen (e.g. Shtora), active laser self-defence weapon with laser dazzler (LSDW, used on the Chinese Type 99 main battle tank[2]), laser jammer, etc.
Detectors used in LWR are usually based on a semiconductor photodetector array, which is typically cryogenically or thermal-electric cooled. Sometimes avalanche photodiodes (APD), photoconductivity, photoelectromagnetic, or photodiffusion devices are used even without cooling.[3] Some devices detect only the main beam of foreign lasers while others detect even scattered rays.
^Electronic Warfare in Operations: U. S. Army Field Manual FM 3-36. DIANE. 25 February 2009. p. A-4. ISBN 9781437914245. Retrieved 7 February 2015. (PDF version 4.53 MB)
^"Type 99 Main Battle Tank".
^"Boston Electronics - Detectors in Laser Warning Receivers". Archived from the original on 2011-12-06. Retrieved 2012-01-31.
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