| 摘要 |
PURPOSE:To decrease the fluctuation of wavelengths due to the deformation of each Fabry-Perot(F-P) etalon by providing the F-P etalon having the narrowest transmission bandwidth out of F-P etalons at a place nearest to the 1st total reflection mirror in the 1st and 2nd total reflection mirrors and a plurality of the F-P etalons which make up an optical resonator. CONSTITUTION:This device is equipped with: a discharge tube 1; total reflecting mirrors 2 and 3; a semi-transparent mirror 4; F-P etalons 5 and 6. An F-P etalon having the narrowest transmission bandwidth out of the F-P etalons is installed at a place nearest to the 1st total reflection mirror 2. As a result, the energy of a light entering into a space where the F-P etalons 5 and 6 are installed decreases up to an extent that energy in the ordinary case is multiplied by transmission factor of the semi-transparent mirror 4. Further, the light attenuated by one F-P etalon enters into the other F-P etalon having the narrowest transmission bandwidth which determines the oscillation wavelength of a laser. The fluctuation of the central wavelengths of a laser light because of the deformation of each F-P etalon is thus decreased. |
