Patent ID: 6788717
Filing Date: 2004-09-07
Classification: H01S

Abstract:
A wavelength stabilized laser module, comprising:a semiconductor laser; a temperature calibrating unit to calibrate a temperature of said semiconductor laser; only one lens to arrange light emitted from said semiconductor laser so as to be a single parallel luminous flux; a first photoelectric converting unit to receive one part of said parallel luminous flux and to convert it to a first electric signal; a filter to receive another part of said parallel luminous flux and to continuously change its transmittance depending on wavelengths of said light; a second photoelectric converting unit to receive light transmitted through said filter and to convert it to a second electric signal; wherein a control signal, to be used for stabilization of wavelengths, obtained by computations of said first electric signal and said second electric signal fed from said first photoelectric converting unit and said second photoelectric converting unit, is fed back to said semiconductor laser and/or said temperature calibrating unit so that said semiconductor laser is able to stably emit laser light having a reference wavelength to be used as a target for stabilization of wavelengths.