An Automatic Mechanical Feedback System for Controlling the Amplitude of a Pulsed Laser System
M. Miao, S. Wang and C. Gu
Pulsed lasers, especially ultrafast lasers, have gradually become an effective tool in both academic and industry fields. Among several key parameters, such as pulse duration, beam diameter, phase matching, etc., the amplitude of single laser pulse is one dominant parameter, which will directly affect the average and peak power of a laser system; however, as working time moves on, the amplitude of laser pulses will diminish by time, typically 2% per hour, and even more if the laser has been working for a long time. Based on this scenario, an automatic feedback system consisting of an oscilloscope, a half wave plate and a polarizer was developed. This new design can greatly improve the stability of the amplitude of laser pulses, without any manual operation.
Keywords: Pulsed laser, ultrafast, pulse amplitude, automatic feedback