Patent ID: 6650667
Filing Date: 2003-11-18
Classification: H01S

Abstract:
A semiconductor laser apparatus comprising:a light-emitting portion including a light-emitting device for outputting a laser beam; a light-receiving element for receiving the laser beam outputted from said light-emitting device; a first temperature regulating portion coupled to said light-emitting portion; a wavelength monitoring portion comprising an optical system disposed between said light-emitting device and said light-receiving element; a second temperature regulating portion separated from said first temperature regulating portion and coupled to said wavelength monitoring portion, such that the temperature of said wavelength monitoring portion is controlled independently of said light-emitting portion; a control portion for controlling the wavelength of the laser beam outputted from said light-emitting device by controlling said first temperature regulating portion based on the wavelength of the laser beam detected by said wavelength monitoring portion; and an optical isolator disposed on the optical path between said light-emitting device and said wavelength monitoring portion for preventing the light from returning from said wavelength monitoring portion back to said light-emitting device.