Patent ID: 6775307
Filing Date: 2004-08-10
Classification: G02F,H01S

Abstract:
A light wavelength conversion module comprising:a semiconductor laser having a resonator side emitting a first beam from the resonator side; a reflective mirror facing the resonator side of said semiconductor laser and receiving the first beam; a wavelength selecting element disposed between said semiconductor laser and said reflective mirror and positioned to receive the first beam and select an oscillation wavelength of the first beam, so that only a selected oscillation wavelength reflects off the reflective mirror back to the semiconductor laser; and a light wavelength conversion element optically coupled to said semiconductor laser on a side other than the resonator side, with said light wavelength conversion element placed to receive a second laser beam having a plurality of longitudinal mode spectra from said semiconductor laser, the conversion element configured to output second harmonic generation light; wherein the selected oscillation wavelength of said semiconductor laser is locked by an external resonator comprising the resonator side of said semiconductor laser and said reflective mirror and the output amount of the second harmonic generation light is stabilized by the locking of the oscillation wavelength of the semiconductor laser; whereby an output light amount of the light wavelength conversion element increases monotonically as a driving current of said semiconductor laser increases.