Influence of focusing intensity on optically pumped metastable rare gas based on laser-induced ionization

Hu, Shu; Huang, Ke; Zhu, Feng; Li, Juntao; Gai, Baodong; Cai, Xianglong; Xu, Ming; Guo, Jingwei

doi:10.1016/j.jqsrt.2023.108776

Journal of Quantitative Spectroscopy and Radiative Transfer

2023

DOI: 10.1016/j.jqsrt.2023.108776

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Influence of focusing intensity on optically pumped metastable rare gas based on laser-induced ionization

Shu Hu,

Ke Huang,

Feng Zhu

et al.

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Temporal evolution of laser-induced ionization and recombination processes in argon-helium mixture

Hu,

Huang,

Zhu

et al. 2023

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Preparation of metastable atoms (1s5) through laser-induced preionization holds the potential to mitigate the electromagnetic interference (EMI) issues associated with the large volume, atmospheric pressure discharge of traditional optically pumped rare-gas metastable laser (OPRGL). In this work, we conducted experimental investigations into the temporal evolution of the Ar 763.5 nm (2p6→1s5) spectral line in Ar-He mixture. These experiments unveiled the intricate interaction mechanism involving the laser, Ar atoms, He atoms, and free electrons within the laser-induced plasma. Our findings highlight the dual contributions of the multiphoton ionization and the inverse bremsstrahlung process to the initial plasma formation. Notably, the time-resolved atomic emission spectrum at 763.5 nm reveals two distinct regimes, namely Regime1 and Regime2. Regime1 primarily arises from the “excitation + radiation + collisional relaxation” process, wherein excited states Ar atoms, populated via multiphoton excitation and electron impact excitation, accumulate on the 2p6 level. Conversely, Regime2 is predominantly a result of the “ion-electron recombination” process. In this regime, highly excited states Ar atoms are generated through the recombination of ion and electron, subsequently populating the 2p6 level through a combination of radiation and collisional relaxation channels. The differences in the temporal evolution between 763.5 nm and 811.5 nm spectral lines can be attributed to the distinct radiation and collisional relaxation channels in the two aforementioned processes.

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Temporal evolution of laser-induced ionization and recombination processes in argon-helium mixture

Hu,

Huang,

Zhu

et al. 2023

Opt. Continuum

View full text Add to dashboard Cite

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Influence of focusing intensity on optically pumped metastable rare gas based on laser-induced ionization

Cited by 1 publication

References 34 publications

Temporal evolution of laser-induced ionization and recombination processes in argon-helium mixture

Temporal evolution of laser-induced ionization and recombination processes in argon-helium mixture

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