Development of damage resistant sputtered oxide optical coatings for use at 248 NM

Technical Report · Thu Oct 01 00:00:00 EDT 1981

DOI:https://doi.org/10.2172/5922065· OSTI ID:5922065

Pawlewicz, W T; Martin, P M; Hays, D D; Mann, I B

This report summarizes the results of a six-month effort to develop damage-resistant Kr*F laser mirrors by using and refining reactive sputter deposition techniques for the fabricaton of multilayer oxide optical coatings. Mirror performance goals included a reflectivity of 99% at 248 nm and a laser damage threshold of 5 J/cm/sup 2/ for 20 ns pulses. Oxide multilayer coating combinations selected for development were SiO/sub 2//Al/sub 2/O/sub 3/, SiO/sub 2//HfO/sub 2/ and SiO/sub 2//Y/sub 2/O/sub 3/. Selection was based on review and compilation of the optical properties of oxide materials reported in the recent literature. Twenty-eight coatings of selected designs were fabricated on LLNL substrates for laser damage testing by LLNL. Forty other coatings were fabricated on PNL substrates for optical, microstructural and topographical characterization by PNL aimed at optimization of their performance. Specimens for damage testing consisted of single layers of Al/sub 2/O/sub 3/, HfO/sub 2/ and Y/sub 2/O/sub 3/ in thicknesses of lambda/2, 3lambda/2 and 2lambda at 248 nm plus high reflectors of the design LL (HL)/sup m/ HLL.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 5922065
• Report Number(s): PNL-3869; ON: DE82003525; TRN: 82-001548
• Country of Publication: United States
• Language: English

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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ALUMINIUM OXIDES
OPTICAL PROPERTIES
CHEMICAL LASERS
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LASER MIRRORS
COATINGS
SILICON OXIDES
YTTRIUM OXIDES
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FLUORINE COMPOUNDS
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HALOGEN COMPOUNDS
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LASERS
MIRRORS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATION EFFECTS
RARE GAS COMPOUNDS
SILICON COMPOUNDS
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