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Proceedings Paper

Use of Al2O3 layers for higher laser damage threshold at 22.5° incidence, S polarization of a 527 nm/1054 nm dichroic coating
Author(s): John C. Bellum; Ella S. Field; Damon E. Kletecka; Patrick K. Rambo; Ian C. Smith
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Paper Abstract

We have designed and reported on a dichroic beam combiner coating consisting of HfO2/SiO2 layer pairs to provide high transmission at 527 nm and high reflection at 1054 nm for 22.5° angle of incidence (AOI) in S polarization (Spol). The laser-induced damage threshold (LIDT) of this first coating at the use AOI and polarization with 3.5 nanosecond (ns) pulses at 532 nm is 7 J/cm2, and only marginally adequate for our beam combining application. In this paper, we describe the use of a combination of Al2O3 and HfO2 high index layers to modify the first as well as a second dichroic coating in two different ways, which results in a higher LIDT of 10 J/cm2 for 3.5 ns pulses at 532 nm and 22.5° AOI, Spol for the second dichroic coating, and in the same 7 J/cm2 LIDT for the first dichroic coating.

Paper Details

Date Published: 6 December 2016
PDF: 9 pages
Proc. SPIE 10014, Laser-Induced Damage in Optical Materials 2016, 1001425 (6 December 2016); doi: 10.1117/12.2257607
Show Author Affiliations
John C. Bellum, Sandia National Labs. (United States)
Ella S. Field, Sandia National Labs. (United States)
Damon E. Kletecka, Sandia National Labs. (United States)
Patrick K. Rambo, Sandia National Labs. (United States)
Ian C. Smith, Sandia National Labs. (United States)


Published in SPIE Proceedings Vol. 10014:
Laser-Induced Damage in Optical Materials 2016
Greg J. Exarhos; Vitaly E. Gruzdev; Joseph A. Menapace; Detlev Ristau; MJ Soileau, Editor(s)

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