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12 October 2016 Design and laser damage properties of a dichroic beam combiner coating for 22.5-deg incidence and S polarization with high transmission at 527 nm and high reflection at 1054 nm
John C. Bellum, Ella S. Field, Damon E. Kletecka, Patrick K. Rambo, Ian C. Smith
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Optical Engineering, Vol. 56, Issue 1, 011020 (October 2016). https://doi.org/10.1117/1.OE.56.1.011020
Abstract
We designed a dichroic beam combiner coating with 11 HfO2/SiO2 layer pairs and deposited it on a large substrate. It provides high transmission (HT) at 527 nm and high reflection (HR) at 1054 nm for a 22.5-deg angle of incidence (AOI), S polarization (Spol), and uses near half-wave layer thicknesses for HT at 527 nm, modified for HR at 1054 nm. The two options for the beam combiner each require that a high intensity beam be incident on the coating from within the substrate (from glass). We analyze the laser-induced damage threshold (LIDT) differences between the two options in terms of the 527- and 1054-nm E-field behaviors for air → coating and glass → coating incidences. This indicates that LIDTs should be higher for air → coating than for glass → coating incidence. LIDT tests at the use AOI, Spol with ns pulses at 532 and 1064 nm confirm this, with glass → coating LIDTs about half that of air → coating LIDTs. These results clearly indicate that the best beam combiner option is for the high intensity 527 and 1054 nm beams to be incident on the coating from air and glass, respectively.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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John C. Bellum, Ella S. Field, Damon E. Kletecka, Patrick K. Rambo, and Ian C. Smith "Design and laser damage properties of a dichroic beam combiner coating for 22.5-deg incidence and S polarization with high transmission at 527 nm and high reflection at 1054 nm," Optical Engineering 56(1), 011020 (12 October 2016). https://doi.org/10.1117/1.OE.56.1.011020
Published: 12 October 2016
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Cited by 4 scholarly publications.
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KEYWORDS
Coating
Glasses
Laser induced damage
Hybrid fiber optics
Interfaces
Reflection
Laser development
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