A variable wavelength laser light source to improve the resolution of the outgoing light and output only pure laser light without the natural emitted light has an optical amplification element (laser) 11, a first optical reflector 12 at one end surface 11a of the optical amplification element 11, and...http://www.google.fr/patents/US6047008?utm_source=gb-gplus-shareBrevet US6047008 - Variable wavelength laser light source
