Patent ID: 7382809
Filing Date: 2008-06-03
Classification: H01S

Abstract:
1. A tunable fiber laser light source comprising: an optical fiber loop which serves as an optical path of laser oscillation; a gain medium which is connected to said optical fiber loop and has a gain with respect to an oscillating wavelength; a light branch incident section which divides a plurality of light beams from said optical fiber loop and returns said light beams to said optical fiber loop through the same optical path as the divided light; a tunable optical filter which receives the plurality of divided light beams divided by said light branch incident section, selects light beams of same wavelength continuously changed, and supplies light beams of the selected wavelength said light branch incident section through the same optical path; and an optical coupler which is connected to said optical fiber loop and takes out a part of light passing through said optical fiber loop, wherein said tunable optical filter includes: an optical beam deflector which is disposed on a light axis emitted from said optical fiber loop and which periodically changes a reflecting angle of an optical beam, obtained from said light branch incident section, within a certain range; and a diffraction grating which receives light beams deflected by said optical beam deflector and reflects said light beams of selected wavelength changing according to an incident angle in the same direction as the incident angle.