Study on dynamic evolution of surface plasma of typical optical windows induced by laser

Yuanshuo Zhang; Shilong Xu; Hongbo Fu; Xi Wang; Yongning Zhang; Le Li; Biyi Wang

doi:10.1117/12.2690945

6 November 2023 Study on dynamic evolution of surface plasma of typical optical windows induced by laser

Yuanshuo Zhang, Shilong Xu, Hongbo Fu, Xi Wang, Yongning Zhang, Le Li, Biyi Wang

Proceedings Volume 12921, Third International Computing Imaging Conference (CITA 2023); 129212R (2023) https://doi.org/10.1117/12.2690945
Event: Third International Computing Imaging Conference (CITA 2023), 2023, Sydney, Australia

Abstract

The 1064 nm laser damage experimental system was established to study the spatiotemporal evolution of plasma generated by K9 window, fused silica, CaF₂ and MgF₂. In the experiment, the ICCD camera was used to capture the plasma morphology at a fixed delay time, while a fiber optic spectrometer was used to collect spectral information of spontaneous emission during the plasma evolution process. The evolution process of plasma generated by K9 window and fused silica was relatively similar, and the evolution process of plasma generated by CaF₂ and MgF₂ was relatively similar too. The transient plasma morphology of different optical windows induced by 1064 nm laser were diverse, indicating that the evolution process of laser plasma had become a unique feature of optical windows. The lifetime of plasma of K9 window, fused silica, CaF₂ and MgF₂ was about 2000 ns, 500 ns, 500 ns and 500 ns induced by 1064 nm laser. Due to the damage thresholds of different optical windows, the time from plasma generation to disappearance was also different. The results of spectral analysis indicated that the plasma spectrum had a direct correlation with the elemental composition of the optical window itself and comparing the spectra of the same optical window under different delay conditions, it could be seen that the delay time of the maximum spectral peak intensity was correlated with the plasma lifetime of optical windows.

Citation Download Citation

Yuanshuo Zhang, Shilong Xu, Hongbo Fu, Xi Wang, Yongning Zhang, Le Li, and Biyi Wang "Study on dynamic evolution of surface plasma of typical optical windows induced by laser", Proc. SPIE 12921, Third International Computing Imaging Conference (CITA 2023), 129212R (6 November 2023); https://doi.org/10.1117/12.2690945

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KEYWORDS

Plasma

Windows

Plasma generation

Silica

Magnesium fluoride

Ions

Laser radiation

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