Investigation of laser induced air breakdown thresholds at 1064, 532, 355, 266 and 248nm

Zhixing Gao; Lixuan Han; Jing Li

doi:10.1117/12.2539007

8 July 2019 Investigation of laser induced air breakdown thresholds at 1064, 532, 355, 266 and 248nm

Zhixing Gao, Lixuan Han, Jing Li

Proceedings Volume 11063, Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers; 1106305 (2019) https://doi.org/10.1117/12.2539007
Event: Pacific Rim Laser Damage 2019 and Thin Film Physics and Applications 2019, 2019, Qingdao, China

Abstract

Laboratory air is one most popular transparent medium for high power laser beam propagation. Its threshold of laser induced breakdown is one of the key characters for the high power laser system. The thresholds of laser induced air breakdown under laboratory condition were measured using 1064, 532, 355, 266 and 248nm short pulse laser. The focal spot varies from 50μ m to 150μ m which achieved using a lens with 117mm focal length. The measured breakdown thresholds range from 3.2×10¹⁰W/cm² to 5.1×10¹¹W/cm², depending on the wavelength. It is confirmed that the KrF laser induced air breakdown threshold should be 3.2×10¹⁰W/cm², which is almost 1 order of magnitude higher than the reported value of 2.7 ×10⁹W/cm² .The measurements indicate multi-photon ionization is the dominant mechanism since the air breakdown thresholds at 1064, 532, 355, 266 and 248nm seemed well-agreed with the scale law of λ².

Citation Download Citation

Zhixing Gao, Lixuan Han, and Jing Li "Investigation of laser induced air breakdown thresholds at 1064, 532, 355, 266 and 248nm", Proc. SPIE 11063, Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers, 1106305 (8 July 2019); https://doi.org/10.1117/12.2539007

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