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Title: Measurements of heat flow from surface defects in lithium triborate

Abstract

We present what is to our knowledge the first measurement of temperature distributions in a nonlinear optic resulting from absorption in a localized surface defect. These measurements were performed on principal cut samples of lithium triborate with damage spots centered on their front surfaces, pumped by a kW-scale continuous-wave laser. The changes in optical-path length associated with this heating were measured with a Mach–Zehnder interferometer, from which the temperature distribution could be inferred. These distributions have sharper features with larger magnitudes than would be expected with bulk-absorption heating. Comparison with both numerical and analytical models is used to qualify the measurements and to estimate the total power absorbed at a given site using this bulk material response. While sensitivity is dependent on the properties of the material of study, we demonstrate measurements of absorption levels of one part in 10$^5$.

Authors:
 [1];  [1]
  1. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Publication Date:
Research Org.:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1503058
Alternate Identifier(s):
OSTI ID: 1509828
Report Number(s):
2019-1; 1-493
Journal ID: ISSN 1094-4087; OPEXFF; 2019-1, 1493, 2453
Grant/Contract Number:  
NA0003856
Resource Type:
Published Article
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 27; Journal Issue: 7; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Broege, D., and Bromage, J. Measurements of heat flow from surface defects in lithium triborate. United States: N. p., 2019. Web. doi:10.1364/OE.27.010067.
Broege, D., & Bromage, J. Measurements of heat flow from surface defects in lithium triborate. United States. doi:10.1364/OE.27.010067.
Broege, D., and Bromage, J. Tue . "Measurements of heat flow from surface defects in lithium triborate". United States. doi:10.1364/OE.27.010067.
@article{osti_1503058,
title = {Measurements of heat flow from surface defects in lithium triborate},
author = {Broege, D. and Bromage, J.},
abstractNote = {We present what is to our knowledge the first measurement of temperature distributions in a nonlinear optic resulting from absorption in a localized surface defect. These measurements were performed on principal cut samples of lithium triborate with damage spots centered on their front surfaces, pumped by a kW-scale continuous-wave laser. The changes in optical-path length associated with this heating were measured with a Mach–Zehnder interferometer, from which the temperature distribution could be inferred. These distributions have sharper features with larger magnitudes than would be expected with bulk-absorption heating. Comparison with both numerical and analytical models is used to qualify the measurements and to estimate the total power absorbed at a given site using this bulk material response. While sensitivity is dependent on the properties of the material of study, we demonstrate measurements of absorption levels of one part in 10$^5$.},
doi = {10.1364/OE.27.010067},
journal = {Optics Express},
number = 7,
volume = 27,
place = {United States},
year = {2019},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1364/OE.27.010067

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