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

Chi, Han; Baumgarten, Cory M.; Jankowska, Elzbieta; Dehne, Kristian A.; Murray, Gabe; Meadows, Alexander R.; Berrill, Mark; Reagan, Brendan A.; Rocca, Jorge J.

doi:10.1364/JOSAB.36.001084

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

Journal Article · Thu Mar 21 00:00:00 EDT 2019 · Journal of the Optical Society of America. Part B, Optical Physics

DOI:https://doi.org/10.1364/JOSAB.36.001084· OSTI ID:1505298

^[1]; Baumgarten, Cory M. ^[1]; Jankowska, Elzbieta ^[1]; Dehne, Kristian A. ^[2]; Murray, Gabe ^[1]; Meadows, Alexander R. ^[1];

^[3]; Reagan, Brendan A. ^[4]; Rocca, Jorge J. ^[2]

Colorado State Univ., Fort Collins, CO (United States)
3XUV Lasers Inc., Fort Collins, CO (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Colorado State Univ., Fort Collins, CO (United States); 3XUV Lasers Inc., Fort Collins, CO (United States)

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC05-00OR22725; SC0016136

OSTI ID:: 1505298

Alternate ID(s):: OSTI ID: 1502263

Journal Information:: Journal of the Optical Society of America. Part B, Optical Physics, Vol. 36, Issue 4; ISSN 0740-3224

Publisher:: Optical Society of America (OSA)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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