FACTOID # 27: If you're itching to live in a trailer park, hitch up your home and head to South Carolina, where a whopping 18% of residences are mobile homes.
 
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Encyclopedia > Laser gun
Raygun
A raygun is a weapon (mostly or entirely science fiction) that fires a ray or beam of energy that can kill or injure or stun. ...

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Howstuffworks "How does a laser speed gun work to measure a car's speed?" (420 words)
Laser (or lidar, for light detection and ranging) speed guns use a more direct method that relies on the reflection time of light rather than doppler shift.
A laser speed gun shoots a very short burst of infrared laser light and then waits for it to reflect off the vehicle.
The advantage of a laser speed gun (for the police anyway) is that the size of the "cone" of light that the gun emits is very small, even at a range like 1,000 feet (300 meters).
K40 (315 words)
Police are trained to operate laser guns by aiming at the most reflective surface of a vehicle - generally the front license plate - so the emitted light beam can be bounced back for speed measurement.
To work properly, guns have to be stationary, steady, and aimed nearly straight on at the front or rear of the moving target.
Helping to grow this threat are laser gun manufacturers providing police departments with evaluation units and billing them only after enough tickets have been issued to pay for them.
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