&lt;title&gt;Ultraviolet laser cleaning of mirrored surfaces&lt;/title&gt;

Osiecki, R.; Magee, T. J.

doi:10.1117/12.22598

Cited by 2 publications

(2 citation statements)

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“…This method, known as cryogenic aerosol cleaning, is based on two principles: (1) momentum transfer of the C0 2 flakes, and (2) contraction of the dust particle when frozen which causes it to break free from the surface. Another method that has potential is UV laser cleaning (Osiecki and Magee 1990;Zapka et al 1991). Recently laser cleaning has been compared to C0 2 snow cleaning (Kimura et al 1995).…”

Section: Introductionmentioning

confidence: 99%

A Cleaning Process for the CFHT Primary Mirror

McGrath

Nahrstedt²

1996

PASP

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A new in situ contact cleaning method for the 3.6-m Canada-France-Hawaii Telescope primary mirror has been developed. The basis for evaluating the method is portable instrumentation that measures spectral reflectance and scattered light. The instrument has been evaluated and a cleaning technique developed using specially prepared witness mirrors exposed to the operating environment at the summit of Mauna Kea, Hawaii. The results of the long-term experiment show that aluminum coatings can be maintained at a near-new reflectance level.

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Section: Introductionmentioning

confidence: 99%

A Cleaning Process for the CFHT Primary Mirror

McGrath

Nahrstedt²

1996

PASP

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“…In this paper we discuss a new technique, pulsed ultraviolet (UV) laser cleaning, and compare it with CO 2 -snow cleaning. The technique was developed initially for cleaning semiconductor wafers (Zapka et al 1991) and has been very effective on small-diameter mirrors (Osiecki and Magee 1990). The technique is generally safe on any reflecting surface; although, like all other cleaning methods, its efficiency depends on the nature of the contaminant.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Laser and CO2 Snow for Cleaning Large Astronomical Mirrors

Kimura¹,

Kim

Balick³

1995

PASP

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Contaminants on large astronomical reflecting surfaces (hereafter "mirrors") can significantly degrade their reflectivity, IR emissivity, and light-scattering properties. We will show data that the emissivity and scattering can degrade appreciably after just a few days or weeks. A safe, effective, and inexpensive cleaning technique, preferably one that can be used in situ, is especially important for 4-to 8-m class mirrors. Two cleaning methods CO 2 snow and pulsed ultraviolet (UV) lasers, offer the potential to satisfy these needs. Our primary purpose is to compare the two methods, and highlight their advantages and problems. Also, since the UV-laser cleaning technique is a new one, we describe how it works and how it may be implemented. We found that UV-laser cleaning removes contaminants that standard CO 2-snowcleaning techniques do not remove as well or not at all. After 2-4 weeks of exposure, Al-coated-mirror samples placed under the mirror covers of the UKIRT telescope on Mauna Kea and the 4-m telescope on Kitt Peak were cleaned about twice as effectively by the UV laser than the CO 2 snow, based upon the amount of contamination left on the mirrors. For long exposure times, the laser cleaning also restores the thermal emissivity better than the C02 snow. While a CO 2-snow delivery system can be less expensive than a UV-Iaser-cleaning system, the operation costs for cleaning a large-diameter mirror with CO 2 snow can be substantially greater than the costs to run the laser. Unlike C02 snow, laser cleaning can be applied no matter what the local humidity. The ease of both methods facilitates frequent use; however, the cost of the CO 2 may eventually limit its usage.

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<title>Ultraviolet laser cleaning of mirrored surfaces</title>

Cited by 2 publications

References 0 publications

A Cleaning Process for the CFHT Primary Mirror

A Cleaning Process for the CFHT Primary Mirror

Comparison of Laser and CO2 Snow for Cleaning Large Astronomical Mirrors

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