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Title: Thermal behavior characterization of a kilowatt-power-level cryogenically cooled Yb:YAG active mirror laser amplifier

Abstract

We present an analysis of the thermal behavior of a high-energy kilowatt-average-power diode-pumped cryogenically cooled Yb:YAG active mirror laser amplifier based on measurements and simulations. Maps of the temperature distribution of the laser material at pump powers up to 1 kW were obtained for the first time by spatially and spectrally resolving the fluorescence induced by a scanning probe beam. The wavefront distortion resulting from the front surface deformation and the overall deformation of the gain medium assembly were measured using a Mach–Zehnder interferometer. The measured deformations agree well with the results of thermomechanical modeling using finite element method simulations, and with the results of focal length shift measurements. The relative contributions to the optical path difference (OPD) of the mechanical deformations, refractive index changes, and electronic contribution are discussed. We propose that the Cr 4+:YAG cladding plays a significant role in both the temperature distribution and the overall OPD changes. Moreover, the pump-induced mechanical deformations of the assembly dominate the OPD changes in this kilowatt-average-pump-power cryogenically cooled Yb:YAG active mirror laser.

Authors:
ORCiD logo [1];  [1];  [1];  [2];  [1];  [1]; ORCiD logo [3];  [4];  [2]
  1. Colorado State Univ., Fort Collins, CO (United States)
  2. 3XUV Lasers Inc., Fort Collins, CO (United States)
  3. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  4. Colorado State Univ., Fort Collins, CO (United States); 3XUV Lasers Inc., Fort Collins, CO (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1505298
Alternate Identifier(s):
OSTI ID: 1502263
Grant/Contract Number:  
AC05-00OR22725; SC0016136
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the Optical Society of America. Part B, Optical Physics
Additional Journal Information:
Journal Volume: 36; Journal Issue: 4; Journal ID: ISSN 0740-3224
Publisher:
Optical Society of America (OSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Chi, Han, Baumgarten, Cory M., Jankowska, Elzbieta, Dehne, Kristian A., Murray, Gabe, Meadows, Alexander R., Berrill, Mark, Reagan, Brendan A., and Rocca, Jorge J. Thermal behavior characterization of a kilowatt-power-level cryogenically cooled Yb:YAG active mirror laser amplifier. United States: N. p., 2019. Web. doi:10.1364/JOSAB.36.001084.
Chi, Han, Baumgarten, Cory M., Jankowska, Elzbieta, Dehne, Kristian A., Murray, Gabe, Meadows, Alexander R., Berrill, Mark, Reagan, Brendan A., & Rocca, Jorge J. Thermal behavior characterization of a kilowatt-power-level cryogenically cooled Yb:YAG active mirror laser amplifier. United States. doi:10.1364/JOSAB.36.001084.
Chi, Han, Baumgarten, Cory M., Jankowska, Elzbieta, Dehne, Kristian A., Murray, Gabe, Meadows, Alexander R., Berrill, Mark, Reagan, Brendan A., and Rocca, Jorge J. Thu . "Thermal behavior characterization of a kilowatt-power-level cryogenically cooled Yb:YAG active mirror laser amplifier". United States. doi:10.1364/JOSAB.36.001084.
@article{osti_1505298,
title = {Thermal behavior characterization of a kilowatt-power-level cryogenically cooled Yb:YAG active mirror laser amplifier},
author = {Chi, Han and Baumgarten, Cory M. and Jankowska, Elzbieta and Dehne, Kristian A. and Murray, Gabe and Meadows, Alexander R. and Berrill, Mark and Reagan, Brendan A. and Rocca, Jorge J.},
abstractNote = {We present an analysis of the thermal behavior of a high-energy kilowatt-average-power diode-pumped cryogenically cooled Yb:YAG active mirror laser amplifier based on measurements and simulations. Maps of the temperature distribution of the laser material at pump powers up to 1 kW were obtained for the first time by spatially and spectrally resolving the fluorescence induced by a scanning probe beam. The wavefront distortion resulting from the front surface deformation and the overall deformation of the gain medium assembly were measured using a Mach–Zehnder interferometer. The measured deformations agree well with the results of thermomechanical modeling using finite element method simulations, and with the results of focal length shift measurements. The relative contributions to the optical path difference (OPD) of the mechanical deformations, refractive index changes, and electronic contribution are discussed. We propose that the Cr4+:YAG cladding plays a significant role in both the temperature distribution and the overall OPD changes. Moreover, the pump-induced mechanical deformations of the assembly dominate the OPD changes in this kilowatt-average-pump-power cryogenically cooled Yb:YAG active mirror laser.},
doi = {10.1364/JOSAB.36.001084},
journal = {Journal of the Optical Society of America. Part B, Optical Physics},
number = 4,
volume = 36,
place = {United States},
year = {2019},
month = {3}
}

Journal Article:
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This content will become publicly available on March 21, 2020
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