| 摘要 |
PURPOSE:To prevent a laser device of this design from varying in wavelength and deteriorating in output by a method wherein a wavelength selection element is provided into an optical path other than an output optical path which extends from a laser medium passing through a polarized light separator, and a wavelength phase shifter and a third reflective mirror are provided into an optical path other than a resonator optical path which branches off from a partial polarized light separator. CONSTITUTION:An optical resonator composed of a first reflective mirror 2 and a second reflective mirror 3, a partial polarized light separator 4 and a polarized light separator 5 provided into a resonator optical path, a wave length selection element provided into the resonator optical path other than an output optical path passing through the polarization light separator 5, and a wavelength phase shifter 7 and a third reflector mirror 8 provided into an optical light path other than the resonator optical path branching off from the partial polarized light separator 4 are provided. A part of light, which is specified in wavelength and formed in the optical resonator passing through the laser medium and the wavelength selection element 6, is extracted from the partial polarized light separator 4, converted in plane of polarization through a wavelength phase shifter 7, amplified again through the laser medium, and then outputted from the polarized light separator 5. By this setup, optical energy is made decrease to such an extent that an output light is divided by the amplification factor of the laser medium, and a wavelength selection element is sharply decreased in deformation and deterioration. |
