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Title: Laser induced damage in coatings for cryogenic Yb:YAG active mirror amplifiers

Abstract

We report results of a study of the laser induced damage threshold (LIDT) behavior of ion beam sputtered H f O 2 / S i O 2 multilayer coatings on Yb:YAG using 1-on-1 and N-on-1 test protocols. The tests were conducted at ambient, vacuum, and cryogenic conditions using 280 ps pulses at λ <#comment/> = 1030 n m . The 1-on-1 LIDT of antireflection (AR) stacks is found to be only slightly reduced under vacuum and cryogenic conditions, while that of high reflectivity (HR) stacks is insensitive to environmental conditions within the uncertainty of the measurements. Cryogenic N-on-1 tests show the LIDT of the HR coating is almost the same as in the 1-on-1 tests. Conversely, the cryogenic N-on-1 test of the AR coating shows damage at ∼ <#comment/> 13 J / c m 2 , a fluence lower than the 20.4 J / c m 2 of 1-on-1 tests. The AR damage behavior is found to be affected by imperfections at the Yb:YAG surface. These findings show that high surface quality is required to increase energy extraction from active mirror laser amplifiers.

Authors:
; ; ; ; ; ; ORCiD logo
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1646528
Grant/Contract Number:  
SC0016136
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Optics Letters
Additional Journal Information:
Journal Name: Optics Letters Journal Volume: 45 Journal Issue: 16; Journal ID: ISSN 0146-9592
Publisher:
Optical Society of America
Country of Publication:
United States
Language:
English

Citation Formats

Wang, Hanchen, Meadows, Alexander R., Jankowska, Elzbieta, Randel, Emmett, Reagan, Brendan A., Rocca, Jorge J., and Menoni, Carmen S. Laser induced damage in coatings for cryogenic Yb:YAG active mirror amplifiers. United States: N. p., 2020. Web. doi:10.1364/OL.399293.
Wang, Hanchen, Meadows, Alexander R., Jankowska, Elzbieta, Randel, Emmett, Reagan, Brendan A., Rocca, Jorge J., & Menoni, Carmen S. Laser induced damage in coatings for cryogenic Yb:YAG active mirror amplifiers. United States. https://doi.org/10.1364/OL.399293
Wang, Hanchen, Meadows, Alexander R., Jankowska, Elzbieta, Randel, Emmett, Reagan, Brendan A., Rocca, Jorge J., and Menoni, Carmen S. Fri . "Laser induced damage in coatings for cryogenic Yb:YAG active mirror amplifiers". United States. https://doi.org/10.1364/OL.399293.
@article{osti_1646528,
title = {Laser induced damage in coatings for cryogenic Yb:YAG active mirror amplifiers},
author = {Wang, Hanchen and Meadows, Alexander R. and Jankowska, Elzbieta and Randel, Emmett and Reagan, Brendan A. and Rocca, Jorge J. and Menoni, Carmen S.},
abstractNote = {We report results of a study of the laser induced damage threshold (LIDT) behavior of ion beam sputtered H f O 2 / S i O 2 multilayer coatings on Yb:YAG using 1-on-1 and N-on-1 test protocols. The tests were conducted at ambient, vacuum, and cryogenic conditions using 280 ps pulses at λ <#comment/> = 1030 n m . The 1-on-1 LIDT of antireflection (AR) stacks is found to be only slightly reduced under vacuum and cryogenic conditions, while that of high reflectivity (HR) stacks is insensitive to environmental conditions within the uncertainty of the measurements. Cryogenic N-on-1 tests show the LIDT of the HR coating is almost the same as in the 1-on-1 tests. Conversely, the cryogenic N-on-1 test of the AR coating shows damage at ∼ <#comment/> 13 J / c m 2 , a fluence lower than the 20.4 J / c m 2 of 1-on-1 tests. The AR damage behavior is found to be affected by imperfections at the Yb:YAG surface. These findings show that high surface quality is required to increase energy extraction from active mirror laser amplifiers.},
doi = {10.1364/OL.399293},
journal = {Optics Letters},
number = 16,
volume = 45,
place = {United States},
year = {Fri Aug 07 00:00:00 EDT 2020},
month = {Fri Aug 07 00:00:00 EDT 2020}
}

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