Residual pump diagnostics of lasing-state absorption in multipass pumped Yb:YAG thin-disk lasers
Abstract
Residual pump power was used as a spatially integrated diagnostic of inversion-dependent absorption in 32-pass pumped Yb:YAG thin-disk lasers. A quasi-three-level rate-equation model was coupled to accumulated pump flux, intracavity signal flux, and an effective ASE-induced depletion term. Two disks were tested under non-lasing and multimode lasing conditions. The analysis reproduced residual pump fractions within 2.4\% in non-lasing and 1.8\% in multimode operation, and output power within 1.3\% relative error. Stimulated emission reduced the steady-state inversion and increased the effective pump-band absorption relative to the non-lasing case, while the absorption remained below the room-temperature small-signal value. The same absorption state was then used to estimate volumetric heat-load trends and to assess pump-pass number and output-coupler transmission for high-power thin-disk scaling.
Versions
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BibTeX
@misc{jo2026residual,
title = {{Residual pump diagnostics of lasing-state absorption in multipass pumped Yb:YAG thin-disk lasers}},
author = {Hanjin Jo and Jiří Mužík and Pawel Sikocinski and Michal Chyla and Yoann Levy and Martin Smrž and Tomáš Mocek},
howpublished = {arXiv},
year = {2026},
month = jun,
doi = {10.48550/arxiv.2606.21798},
eprint = {2606.21798},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.21798},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Residual pump diagnostics of lasing-state absorption in multipass pumped Yb:YAG thin-disk lasers
AU - Hanjin Jo
AU - Jiří Mužík
AU - Pawel Sikocinski
AU - Michal Chyla
AU - Yoann Levy
AU - Martin Smrž
AU - Tomáš Mocek
PY - 2026
DA - 2026/06/19
PB - arXiv
DO - 10.48550/arxiv.2606.21798
UR - https://arxiv.org/abs/2606.21798
AB - Residual pump power was used as a spatially integrated diagnostic of inversion-dependent absorption in 32-pass pumped Yb:YAG thin-disk lasers. A quasi-three-level rate-equation model was coupled to accumulated pump flux, intracavity signal flux, and an effective ASE-induced depletion term. Two disks were tested under non-lasing and multimode lasing conditions. The analysis reproduced residual pump fractions within 2.4\% in non-lasing and 1.8\% in multimode operation, and output power within 1.3\% relative error. Stimulated emission reduced the steady-state inversion and increased the effective pump-band absorption relative to the non-lasing case, while the absorption remained below the room-temperature small-signal value. The same absorption state was then used to estimate volumetric heat-load trends and to assess pump-pass number and output-coupler transmission for high-power thin-disk scaling.
ER -