| 摘要 |
PCT No. PCT/JP88/00293 Sec. 371 Date Nov. 17, 1988 Sec. 102(e) Date Nov. 17, 1988 PCT Filed Mar. 18, 1988 PCT Pub. No. WO88/07276 PCT Pub. Date Sep. 22, 1988.According to present invention, the central wavelength of the central wave of the output laser beam, and the sideband wave power or central wave power of the output laser beam are detected, and the wavelength selective characteristics of wavelength selective elements disposed between a laser chamber and a rear mirror are controlled such that the detected central wavelength falls within a desired allowable range and that the detected power becomes minimum or maximum. |
