Generation of actively Q-switched pulses with radial polarization using a laser-written S-waveplate in a Ho:YAG laser

Matthew J. Barber; Peter C. Shardlow; Yuhao Lei; Peter G. Kazansky; W. A. Clarkson

doi:10.1117/12.2651469

9 March 2023 Generation of actively Q-switched pulses with radial polarization using a laser-written S-waveplate in a Ho:YAG laser

Matthew J. Barber, Peter C. Shardlow, Yuhao Lei, Peter G. Kazansky, W. A. Clarkson

Author Affiliations +

Proceedings Volume PC12399, Solid State Lasers XXXII: Technology and Devices; PC1239907 (2023) https://doi.org/10.1117/12.2651469
Event: SPIE LASE, 2023, San Francisco, California, United States

Abstract

The development of a 20.6 W radially polarized Ho:YAG laser is reported, which has been actively Q-switched in order to generate 0.52 mJ pulses with a 210 ns full-width half-maximum duration. By utilizing a laser-written spatially-variant birefringent waveplate (S-waveplate) with ultra-low scattering losses inside the cavity, the linearly polarized beam exiting the acousto-optic modulator is transformed into radial polarization with very high conversion efficiency. The excellent radial polarization purity (49:1) and beam quality (M2 of 2.14) highlight this approach as a very suitable platform for high power operation, assisted by the large damage threshold and customizability of the S-waveplate.

Conference Presentation

Citation Download Citation

Matthew J. Barber, Peter C. Shardlow, Yuhao Lei, Peter G. Kazansky, and W. A. Clarkson "Generation of actively Q-switched pulses with radial polarization using a laser-written S-waveplate in a Ho:YAG laser", Proc. SPIE PC12399, Solid State Lasers XXXII: Technology and Devices, PC1239907 (9 March 2023); https://doi.org/10.1117/12.2651469

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