Patent ID: 6590915
Filing Date: 2003-07-08
Classification: G02B,G02F,H01S

Abstract:
A harmonic output stabilizing apparatus for a light source, wherein the light source is a short wavelength light source comprising: a semiconductor laser including a distributed Bragg reflection (DBR) region for controlling an oscillation wavelength and a phase control region; and a wavelength converting device made of a non-linear optical crystal,the apparatus comprising a control section comprising DBR current control means for controlling a DBR current input to the DBR region, and phase control current control means for controlling the phase control current to compensate phase change generated by the controlled DBR current so as to fix the oscillation wavelength of the semiconductor laser at a phase-matching wavelength of the wavelength converting device, wherein the control section further comprises ratio setting means for setting a ratio between the DBR current and the phase control current to a reciprocal of a ratio between a shift of the oscillation wavelength with the variations of the DBR current and a shift of the oscillation wavelength with the variations in the phase control current.