Contaminant removal from telescope optical elements

Details Contaminant removal from telescope optical elements Contaminant removal from telescope optical elements

1990-10-22

1991-11-26

Henry, Jon W.

Optical: systems and elements

Compound lens system

Telescope

359507, 134 1, G02B 2300, B08B 700

Patent

active

050687506

ABSTRACT:
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.

REFERENCES:
patent: 4756765 (1988-07-01), Woodraffe
patent: 4920994 (1990-05-01), Nachbar

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