Patent ID: 6996142
Filing Date: 2006-02-07
Classification: H01S,H04B

Abstract:
1. A light source device comprising: a plurality of laser diodes comprising a reference laser diode; a temperature sensor provided in the vicinity of said plurality of laser diodes; a control loop for controlling the temperatures of said plurality of laser diodes according to an output from said temperature sensor and temperature control conditions for said laser diodes to control oscillation wavelengths of said plurality of laser diodes; means for compensating the temperature control conditions for said laser diodes other than the reference laser diode, according to a change in a temperature control condition for said reference laser diode; and an optical filter in said control loop coupled to said plurality of laser diodes and having a transmittance substantially periodically changing with the wavelength of an incident light, wherein the reference laser diode is operated at temperatures lower than or equal to an ordinary temperature, and said change in said temperature control condition for said reference laser diode comprises a result of a comparison between an initial set temperature and a latest set temperature, where