Laser jammer

A laser jammer is an electronic device used by drivers to prevent law enforcement officers from obtaining speed readings with a LIDAR (or 'laser) gun. Laser jammers are not to be confused with radar jammers.

To jam police laser guns, laser jammers first must detect the light emitted by a police officer's laser gun - normally infrared light on the 904 nm wavelength. After detecting the lidar gun's light, the jammer will send out light on the same wavelength at a higher intensity, effectively confusing the gun into returning no speed reading. Newer laser jammer models can detect the pulse rate (the rate at which the gun takes distance measurements, upon which it bases the speed measurement) of the laser gun, and then emulate that pulse rate, further increasing the difficulty of getting an accurate reading from the laser gun.