Lei Peng, Shen Yuanyi, Wang Xinbing, Zuo Duluo
Opt Express. 2023 Jul 17;31(15):25339-25349. doi: 10.1364/OE.496407.
Optically pumped metastable rare gas laser (OPRGL), as a potential high-energy laser has attracted much attention. During extensive research on OPRGL, the realization of volume discharge with high-metastable density has always been a priority and is essential to the efficient lasing of OPRGL. A large-volume plasma of He/Ar with high metastable density at atmospheric pressure can be generated by applying peaking capacitors near the electrodes. In this article, 0.8 cm of He/Ar plasma at a pressure of 900 mBar, with a peak value of metastable argon density higher than 10cm was realized. The metastable density was measured by absorption spectroscopy based on the absorption bandwidths acquired at a pressure range of 400-900 mbar where a probe beam at a weak line with wavelength 772.38 nm was applied. Furthermore, the high metastable density was verified by the laterally-observed laser-induced fluorescence, as well as the laser oscillation of 100 mW under a longitudinal pumping with a short gain length of 8 mm.
光泵浦亚稳态稀有气体激光器（OPRGL）作为一种潜在的高能激光器备受关注。在对OPRGL的广泛研究中，实现具有高亚稳态密度的体积放电一直是首要任务，并且对于OPRGL的高效激光发射至关重要。通过在电极附近应用峰值电容器，可以在大气压下产生具有高亚稳态密度的大体积He/Ar等离子体。在本文中，实现了900毫巴压力下0.8厘米的He/Ar等离子体，亚稳态氩密度峰值高于10厘米³。亚稳态密度是通过吸收光谱法测量的，该方法基于在400 - 900毫巴压力范围内获取的吸收带宽，在此压力范围内应用了波长为772.38纳米的弱线探测光束。此外，通过横向观察激光诱导荧光以及在8毫米短增益长度的纵向泵浦下100毫瓦的激光振荡，验证了高亚稳态密度。
