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The advantages of CILAS over a sniper rifle that they are touting are stated as follows in the article: "Silent and invisible, CILAS’ “sniper laser” would definitely hit the enemy by surprise being totally silent, generating uncertainty and psychological pressure on the opponent."


Many current sniper detection and location systems use acoustic sensors to detect the sound of the gun firing and locate the source of that sound, in conjunction with IR sensors that detect and locate the flash from the gun firing. Those systems would not be able to detect nor locate the laser weapon. Once one knows that the enemy is using such laser weapons and what their characteristics are, then one can develop sensors to detect the laser beam scattering as it propagates through the atmosphere and trace the beam back to the laser source.


Current laser warning systems can detect when a target on which the system is mounted is being illuminated by a laser and determine the direction that the laser beam is coming from, but most of them have been designed to detect pulsed lasers that are currently used for laser rangefinders and laser designators. On the other hand, some current laser warning systems also include the detection of low power continuous wave (cw) lasers that are used for laser beam rider guidance, and may include the detection of other lasers used for illumination purposes, such as illuminators, pointers, dazzlers and night vision devices. See https://www.emsopedia.org/entries/laser-warning-system/ , https://www.mobilityengineeringtech.com/component/content/article/28778-laser-detecting-systems  and https://www.sentinelphotonics.co.uk/detect/


I would be surprised if there are not ongoing R&D projects to add detection of HEL illumination to laser warning systems in parallel with the development of the HEL weapons, but I do not have any information on any such projects.


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