Patent ID: 6490300
Filing Date: 2002-12-03
Classification: H01S

Abstract:
A wavelength-stabilized light source apparatus, comprising:a coherent light source of which wavelength is variably controlled by a driver; a beam splitter for splitting the output light from said coherent light source to obtain a part thereof as a control light; a interference optical system for further splitting said control light in two, then giving a predetermined optical path length difference to the resultant two control lights and synthesizing them to generate interference fringes; a modulator means for giving a variation to said optical path length difference in said interference optical system to modulate said interference fringes to be obtained; a photoreceptive device for receiving said interference fringes obtained from said interference optical system; a demodulator for detecting a degree of modulation of a received signal obtained from said photoreceptive device; and a controller for feedback controlling a driving condition for said driver so that the output from said demodulator matches to a predetermined setting.