Patent ID: 6104736
Filing Date: 2000-08-15
Classification: H01S

Abstract:
A driving apparatus for a semiconductor laser, comprising:means for generating modulation frequency to supply driving current to a semiconductor laser in order to control the frequency modulation of a laser beam output by said semiconductor laser;an interference optical system to cause said laser beam to split into two laser beams for measurement and to guide said two laser beams for measurement so as to mutually interfere after passing through optical paths with different optical lengths;means for detecting light to detect the light intensity of said laser beams for measurement after interference;means for detecting high frequency component to detect a high frequency component from the detection signal of said means for detecting light; andmeans for applying bias current to control the bias current applied to said driving current so that the light intensity of said high frequency component, detected by the means for detecting high frequency component, becomes the maximum value.