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Title: Removal of dust particles from metal mirror surfaces by excimer laser radiation

Abstract

The effect of particle desorption from Al mirror surfaces by the influence of pulsed UV laser radiation has been studied. The investigations are closely related to the demands of astronomers, who are looking for a more effective way of cleaning the Al coatings of future very large telescope (VLT) mirrors. A systematic parameter study has been performed in order to determine the irradiation conditions which yield the highest dust removal efficiency (i.e. reflectivity increase) on contaminated samples, taking particularly into account laser induced damage and degradation effects of coating and substrate. The particle removal rate increases with increasing laser fluence, being limited however by the damage threshold of the coating. Therefore, parameters influencing the damage threshold of metal coatings like wavelength, pulse width and number of pulses have been studied in detail. Data indicate that on Al coated BK7 and Zerodur samples KrF laser radiation yields the optimum result, with cleaning efficiencies comparable to polymer film stripping. The initial reflectivity of the clean coating can nearly be reinstalled, in particular when an additional solvent film on the sample surface is applied. Hence, laser desorption seems to be a viable method of cleaning large Al mirrors for telescopes.

Authors:
; ;
Publication Date:
Research Org.:
International Society for Optical Engineering, Washington, DC (United States)
OSTI Identifier:
552200
Report Number(s):
CONF-9410155-Vol.2428
TRN: 98:009013
Resource Type:
Conference
Resource Relation:
Conference: 26. annual Boulder damage symposium: laser-induced damage in optical materials, Boulder, CO (United States), 24-26 Oct 1994; Other Information: PBD: [1995]; Related Information: Is Part Of Laser-induced damage in optical materials: 1994. Twenty-sixth annual Boulder damage symposium, proceedings; Bennett, H.E.; Guenther, A.H.; Kozlowski, M.R.; Newnam, B.E.; Soileau, M.J. [eds.]; PB: 722 p.
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; 66 PHYSICS; LASER RADIATION; DAMAGE; MIRRORS; SURFACE CLEANING; EXCIMER LASERS; DUSTS; REFLECTIVITY; PHYSICAL RADIATION EFFECTS; ALUMINIUM OXIDES

Citation Formats

Mann, K, Wolff-Rottke, B, and Mueller, F. Removal of dust particles from metal mirror surfaces by excimer laser radiation. United States: N. p., 1995. Web.
Mann, K, Wolff-Rottke, B, & Mueller, F. Removal of dust particles from metal mirror surfaces by excimer laser radiation. United States.
Mann, K, Wolff-Rottke, B, and Mueller, F. 1995. "Removal of dust particles from metal mirror surfaces by excimer laser radiation". United States.
@article{osti_552200,
title = {Removal of dust particles from metal mirror surfaces by excimer laser radiation},
author = {Mann, K and Wolff-Rottke, B and Mueller, F},
abstractNote = {The effect of particle desorption from Al mirror surfaces by the influence of pulsed UV laser radiation has been studied. The investigations are closely related to the demands of astronomers, who are looking for a more effective way of cleaning the Al coatings of future very large telescope (VLT) mirrors. A systematic parameter study has been performed in order to determine the irradiation conditions which yield the highest dust removal efficiency (i.e. reflectivity increase) on contaminated samples, taking particularly into account laser induced damage and degradation effects of coating and substrate. The particle removal rate increases with increasing laser fluence, being limited however by the damage threshold of the coating. Therefore, parameters influencing the damage threshold of metal coatings like wavelength, pulse width and number of pulses have been studied in detail. Data indicate that on Al coated BK7 and Zerodur samples KrF laser radiation yields the optimum result, with cleaning efficiencies comparable to polymer film stripping. The initial reflectivity of the clean coating can nearly be reinstalled, in particular when an additional solvent film on the sample surface is applied. Hence, laser desorption seems to be a viable method of cleaning large Al mirrors for telescopes.},
doi = {},
url = {https://www.osti.gov/biblio/552200}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Dec 31 00:00:00 EST 1995},
month = {Sun Dec 31 00:00:00 EST 1995}
}

Conference:
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