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Laser-induced contamination on high-reflective optics

Wagner, Paul (2014) Laser-induced contamination on high-reflective optics. Master's, Hochschule Darmstadt.

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Abstract

Operating high power space-based laser systems in the visible and UV range is problematic due to laser-induced contamination. Organic materials are outgassing in vacuum and deposit on irradiated optical components. To provide reliable space-based laser systems the optical components quality plays a major role. In this thesis laser-induced contamination growth on high-reflective coated optics is investigated for UV irradiation of 355nm with naphthalene as contamination material. Four different kinds of optics were investigated: three high-reflective coated optics fabricated by Electron Beam Deposition, Magnetron Sputtering and Ion Beam Sputtering technique and one anti-reflective coated optic fabricated by Electron Beam Deposition technique. The contamination test procedure was designed to perform laser-induced contamination tests on 45° high-reflective coated optics. For the first time in-situ observation of contamination induced damage was performed using a long distance microscope. Additionally the onset and evolution of deposit formation and contamination induced damage of optical samples was observed by in-situ laser-induced fluorescence and reflection monitoring. Ex-situ characterization of deposits and damage morphology was performed by differential interference contrast microscopy and fluorescence microscopy. It was found that at a partial pressure of contamination material in the range of 10E-5mbar induced a drastic reduction of laser damage threshold compared to values obtained without contamination.

Item URL in elib:https://elib.dlr.de/88540/
Document Type:Thesis (Master's)
Title:Laser-induced contamination on high-reflective optics
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wagner, Paulpaul.wagner (at) dlr.deUNSPECIFIED
Date:February 2014
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:72
Status:Unpublished
Keywords:LIC, laser-induced contamination, UV laser, damage morphology, high-reflective optics, coating techniques, contamination growth, naphthalene, long distance microscope, fluorescence, damage threshold
Institution:Hochschule Darmstadt
Department:Fachbereich für Mathematik und Naturwissenschaften
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Laser Research and Technology (old)
Location: Stuttgart
Institutes and Institutions:Institute of Technical Physics > Active Optical Systems
Deposited By: Wagner, Paul
Deposited On:08 Aug 2014 06:52
Last Modified:31 Jul 2019 19:45

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