Patent ID: 9720301
Date: 2017-08-01
CPC Classifications: G02F,H01S

Claim:
1. A laser light source apparatus comprising: a semiconductor laser; a lighting circuit, which lights the semiconductor laser; a wavelength conversion element which carries out wavelength conversion of laser light emitted from the semiconductor laser; a detection unit which detects the temperature of the wavelength conversion element; a heating unit which heats the wavelength conversion element; a control unit which controls the lighting circuit and the heating unit, wherein the control unit has a temperature control unit which controls the amount of electric supply to the heating unit based on a difference between temperature detected by the detection unit and a setting temperature, and which performs control so that the temperature of the wavelength conversion element turns into the setting temperature; an optimal temperature setting unit which, without using an output from the wavelength conversion element, obtains an optimal setting temperature at which the amount of electric power supplied to the heating unit turns into a local maximum, based on the amount of electric power supplied to the heating unit at each setting temperature measured while changing the setting temperature when the wavelength conversion element is irradiated with laser light, wherein the control unit controls the lighting circuit and the heating unit so that the temperature of the wavelength conversion element turns into the optimal setting temperature.