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Analysis of the air – vacuum effect in dielectric coatings

Riede, Wolfgang und Allenspacher, Paul und Jensen, Lars (2008) Analysis of the air – vacuum effect in dielectric coatings. In: Boulder Damage Symposium. SPIE. 41. Boulder Damage Symposium, 2008-09-22, Boulder CO USA.

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Kurzfassung

As a consequence of the ongoing interest for deployment of laser systems into space, optical coatings have to be developed which allow for reliable long term operation under vacuum conditions. Extensive laser damage tests for space qualification of laser optics have recently been performed at the LZH and DLR test facilities in the IR, VIS, and UV spectral range within the ESA-ALADIN (Atmospheric Laser Doppler Instrument) test campaign. These tests have revealed consistently the degradation of the LIDT values for e-beam evaporated dielectric coatings under vacuum environment, which occurred independently of wavelength and type of coating. Dense coatings like IAD-based coatings, on the other hand, did not show this effect. Water desorption and diffusion processes seem to mediate the degradation. In this paper we perform an analysis of the air–vacuum effect for different types of coatings (highly reflective, anti-reflective, and partial reflective) at different wavelengths (355 nm, 1064 nm), being manufactured at the LZH coating facility. In the analysis, various effects like thermal conductivity or mechanical stress are considered. Stress is induced mechanically onto coatings and its influence on the LIDT values is measured. Spectral vacuum shift measurements were performed to identify the involved timescales for water adsorption and desorption processes. High-resolution microscopy is used to monitor the surface properties and porosity of the coatings under investigation.

Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Analysis of the air – vacuum effect in dielectric coatings
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Riede, WolfgangNICHT SPEZIFIZIERT
Allenspacher, PaulNICHT SPEZIFIZIERT
Jensen, LarsLZH
Datum:22 September 2008
Erschienen in:Boulder Damage Symposium
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Verlag:SPIE
Name der Reihe:Proceedings of Boulder Damage Symposium
Status:veröffentlicht
Stichwörter:coating stress, laser damage, vacuum operation
Veranstaltungstitel:41. Boulder Damage Symposium
Veranstaltungsort:Boulder CO USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2008-09-22
Veranstalter :SPIE
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Laserforschung und -technologie
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Physik
Hinterlegt von: Wolfgang Riede
Hinterlegt am:03 Nov 2008
Letzte Änderung:27 Apr 2009 15:25

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