| 摘要 |
PCT No. PCT/DE89/00250 Sec. 371 Date Dec. 17, 1990 Sec. 102(e) Date Dec. 17, 1990 PCT Filed Apr. 21, 1989 PCT Pub. No. WO89/10642 PCT Pub. Date Nov. 2, 1989.A laser has a beam path multiply folded by two resonator end mirrors and at least one reflector retroreflectively folding the laser beam. The laser axis is parallel displaced to the axis of a further reflector. In order to improve the laser beam quality while retaining its comparatively low adjustment sensitivity, the beam path is folded at least twice with the retroreflective reflector.
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