Abstract
This paper describes a laser angle sensor with a femtosecond laser based on the laser autocollimation method. Instead of a semiconductor laser in the conventional laser autocollimation sensor, a femtosecond mode-locked laser is employed as the light source. The collimated beam from the femtosecond laser is projected on a target reflector. The reflected beam is received by an autocollimation unit, which is optimized for femtosecond mode-locked laser. Since the carrier frequency of the femtosecond laser is stabilized by an external rubidium frequency standard, the sensor sensitivity can be improved. The prototype sensor has been designed and fabricated, and the results of the evaluation experiments are presented.
