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9 March 2023 Double-pass amplification of a radially polarized beam up to 33.7 W using a Ho:YAG thin-slab architecture
Matthew J. Barber, Peter C. Shardlow, Callum R. Smith, W. A. Clarkson
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Proceedings Volume PC12399, Solid State Lasers XXXII: Technology and Devices; PC1239906 (2023) https://doi.org/10.1117/12.2651466
Event: SPIE LASE, 2023, San Francisco, California, United States
Abstract
High power amplification of a 2090 nm radially polarized laser beam has been demonstrated using a double-pass Ho:YAG thin-slab crystal, generating up to 33.7 W of output power for a 13.2 W radially polarized seed laser. The amplifier crystal was end-pumped with a 95 W single-mode 1907 nm thulium fiber laser, tailored for suitable overlap with the radially polarized beam. By compensation of depolarizing effects such as thermally-induced stress birefringence and the Gouy phase shift, the degradation of the radially polarized beam is minimized, with the chosen amplifier architecture being readily applicable to much higher seed and pump powers.
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Matthew J. Barber, Peter C. Shardlow, Callum R. Smith, and W. A. Clarkson "Double-pass amplification of a radially polarized beam up to 33.7 W using a Ho:YAG thin-slab architecture", Proc. SPIE PC12399, Solid State Lasers XXXII: Technology and Devices, PC1239906 (9 March 2023); https://doi.org/10.1117/12.2651466
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KEYWORDS
Phase shifts
Polarization
Amplifiers
Birefringence
Crystals
Fiber lasers
High power lasers
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