| 摘要 |
PCT No. PCT/DE89/00432 Sec. 371 Date Feb. 28, 1991 Sec. 102(e) Date Feb. 28, 1991 PCT Filed Jun. 29, 1989 PCT Pub. No. WO90/00319 PCT Pub. Date Jan. 11, 1990.Aerodynamic window for a gas laser, whose active chamber emits a focussed laser beam and is flow connected by means of a beam passage opening with a window chamber connected to a vacuum pump and which has a beam exit opening in an outer area which is preferably under atmospheric pressure. In order to reduce the pumping power necessary for the aerodynamic window and improve the laser beam quality, the window is so constructed that the laser beam emitted by the active chamber has a first focus in the vicinity of the beam passage opening and is deflected onto a focussing mirror arranged in the window chamber and which gives the laser beam leaving the latter a second focus located in the vicinity of the beam exit opening.
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