1 November 1990 Laser cleaning of cryogenic optics
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IR laser heating is the subject of tests to determine its effectiveness as a method of removing optical contaminants with special attention given to on-orbit decontamination. A variety of mirrors are contaminated in a vacuum at a temperature of about 100 K with a BRDF diagnostic monitoring used to measure cleanliness before and after contamination and after laser cleaning. Laser treatments with CO2 and Nd:YAG lasers are investigated for contaminants such as H2O, CO2, and dust. The contaminants usually degraded the BRDF by a factor of about 2, and the laser treatments are generally able to return the BRDF to the precontamination level. The Nd:YAG laser treatment relies on heating the mirror surface and is not as effective and applicable as that of the CO2 laser. Successful cleaning can be achieved at temperatures of 35-300 K with thick contaminant films without damaging or distorting the mirror surface.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Lawrence G. Piper, Lawrence G. Piper, Michael B. Frish, Michael B. Frish, Vicky G. Pierce, Vicky G. Pierce, B. David Green, B. David Green, "Laser cleaning of cryogenic optics", Proc. SPIE 1329, Optical System Contamination: Effects, Measurement, Control II, (1 November 1990); doi: 10.1117/12.22595; https://doi.org/10.1117/12.22595

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