Laser light amount stabilization device

Abstract

Abstract PURPOSE:To stabilize a quantity of laser light by a simple constitution by making a time constant of a filter of an electric signal circuit system variable, and making a response time by an ultrasonic propagation delay time of an acoustic optical element coincide with a response time of an electric signal system. CONSTITUTION:Light 15 of a laser light source 7 is made incident to an acoustic optical element 8 and emitted as output light 16, but a part of the light is made incident to a photodetector 12, compared with set voltage V by a comparator 11, amplified differentially, modulated and amplified by a driving circuit 9 through a low frequency band pass filter 10, and applied to the optical element 8. Also, a time constant of the filter 10 is provided so as to be variable, and by adjusting the time constant, a response time by an ultrasonic propagation delay time of the acoustic optical element 8 can be made to coincide with a response time of an electric signal circuit system. Therefore, a quantity of light stabilizing device of a closed loop is constituted, and a laser light quantity can be stabilized by a simple constitution.

Inventors

• 👤 Fumio Tanaka
• 👤 文雄 田中

Bibliographic Details