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9 March 2023 >70 MW peak power air-cooled Nd:YAG/Cr4+:YAG unstable cavity microchip laser at 100 Hz
Hwan Hong Lim, Takunori Taira
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Proceedings Volume PC12399, Solid State Lasers XXXII: Technology and Devices; PC123990B (2023) https://doi.org/10.1117/12.2649477
Event: SPIE LASE, 2023, San Francisco, California, United States
Abstract
We present an air-cooled unstable cavity Nd:YAG/Cr4+:YAG ceramic microchip laser generating pulses with an energy of 22.54 mJ, a duration of 313.5 ps, and a beam quality M2 of 5.79 at 100 Hz, corresponding a record peak power of 71.9 MW and a record brightness of 189.5 TW/(sr∙cm2). However, the small but high intensity center peak of Bessel-like far-field beam can increase the brightness effectively up to 884 TW/(sr∙cm2) with a long effective Rayleigh range. No significant degradation of laser characteristics was confirmed during power scaling in contrast to common flat-flat resonators, promising further brightness scale-up without amplifier.
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Hwan Hong Lim and Takunori Taira ">70 MW peak power air-cooled Nd:YAG/Cr4+:YAG unstable cavity microchip laser at 100 Hz", Proc. SPIE PC12399, Solid State Lasers XXXII: Technology and Devices, PC123990B (9 March 2023); https://doi.org/10.1117/12.2649477
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KEYWORDS
Laser processing
Laser applications
Picosecond phenomena
YAG lasers
Laser induced breakdown spectroscopy
Medium wave
Plasma
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