| 摘要 |
Illumination, heating and/or damage to baffles (114) and other structures (112) of a telescope (110) during cleaning of its mirrors (116, 118) by a laser beam (128) is avoided by directing the= laser beam from a source (130) outside of the telescope through its entrance aperture (126) and to a reflector (146). The reflector is secured to an already existing telescope shutter (120) so that the beam can be directed on a return path back from the reflector through the entrance aperture and to the outside of the telescope. Preferably, the cleaning occurs by a Nd:GSGG (neodymium and chromium doped gallium garnet crystal) laser (130) after reflection from the reflector. Cleaning is also obtainable by a laser beam generated by a carbon dioxide laser prior to reflection from the reflector.
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