Patent ID: 6597507
Filing Date: 2003-07-22
Classification: G02B,H01S

Abstract:
An external resonator type wavelength variable light source comprising:a semiconductor laser having a antireflection coating at one end face of the semiconductor laser, the semiconductor laser emitting a beam of Light from the one end face; a lens adapted to convert the beam of light from the semiconductor laser into a collimated light beam; a diffraction grating adapted to select a wavelength of the collimated light beam and diffract the collimated light beam; and a mirror adapted to reflect the collimated light beam from the diffraction grating and return the collimated light beam to the diffraction grating, whereby the collimated light beam is diffracted on the diffraction grating and fed back into the semiconductor laser through the lens, wherein the mirror comprises a base member having a reflecting surface; the reflecting surface defines a plurality of grooves in the V-shape at right angle; and the plurality of grooves of the mirror are arranged in parallel.