| 摘要 |
PURPOSE:To enable a laser medium to efficiently absorb LD light rays so as to improve an oscillation energy efficiency by a method wherein an optical guide, which enables the light rays of a semiconductor laser to be obliquely incident on the laser medium, is provided. CONSTITUTION:An exciting light ray 12 for an LD1 is made to be obliquely incident on a laser medium 2. In result, the optical path inside the laser medium 2 becomes long, so that the light rays 12 are effectively absorbed in the laser medium. Furthermore, a part of the exciting light rays 12 reflected by the surface of the laser medium 2 is reflected again by a reflecting surface 71 of an optical guide 7 to make its traveling direction changed and made to be incident on the laser medium 2 again. As mentioned above, the exciting light rays 12 are almost absorbed in the laser medium 2 while they are reflected two or more times in a triangular space constituted with the surface of the laser medium and the reflecting surface 71. Therefore, the LD light ray has a little variation in wavelength and also in an absorbing coefficient, but the laser medium can be effectively excited. The heat generated in the laser medium is transmitted to a cooler 8 through a thin filler 61 and a holder 6 and finally radiated outside from a heat radiating fin 81. |
