| 摘要 |
PCT No. PCT/JP91/00720 Sec. 371 Date Feb. 6, 1992 Sec. 102(e) Date Feb. 6, 1992 PCT Filed May 28, 1991 PCT Pub. No. WO91/20114 PCT Pub. Date Dec. 26, 1991.A laser oscillating apparatus equipped with a folded-type laser resonator designed to fold an optical axis by using a reflecting mirror (11) in addition to an output coupling mirror (4) and a rear mirror (10). The rear mirror (10) consists of a roof reflector having a ridge (10a) set at an angle of (pi)/4 with respect to a plane generated by a folded optical axis. At this time, the reflectance of the rear mirror (10) is higher in a linearly polarizing component having an electric-field vector parallel to the direction of the ridge (10a) than that in a component having an electric-field vector orthogonally intersecting the ridge. The laser beam in the resonator is linearly polarized in the direction of the ridge (10a) in an optical path running between the rear mirror (10) and the reflecting mirror (11) closest to the rear mirror (10). The linearly polarized beam is reflected by the reflecting mirror (11). The reflecting mirror (11) generates a total (pi)/2 phase retardation with respect to the parallel and vertical polarizing components, and accordingly, an emitted beam (13) thus produced is a circularly polarized beam.
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