Segmented pulsed discharge for metastable argon lasing medium

Zhang, Zhifan; Lei, Peng; Zuo, Duluo; Wang, Xinbing

doi:10.3788/col202220.031408

Cited by 4 publications

(3 citation statements)

References 27 publications

(38 reference statements)

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“…探测光路如图2所示. 根据比尔-朗伯定律, 当探测光透过均匀的待测气体时, 入射和出射光强对应关系表达式为 [13] I 1 (ν) 自发辐射速率, 能级简并度和自发辐射速率具体数值可从NIST数据库 [20] 中获取. N为待测亚稳态原子数密度, l为探测光中心波长, l为吸收光程, 在本实验中取值0.8 cm.…”

Section: Kr亚稳态原子数密度unclassified

“…N为待测亚稳态原子数密度, l为探测光中心波长, l为吸收光程, 在本实验中取值0.8 cm. 由(5)式可推得亚稳态原子数密度表达式为 [23] 在同样的放电方式与气压下, Chu等 [13] 利用尾部信号取点得到He-Kr气体体系在直流脉冲平行平…”

Section: Kr亚稳态原子数密度unclassified

“…现有的研究中, 多以高重复率高压直流脉冲平行平板放电研究为主 [12−14] . 2021年, Chu等 [13] 采用平行平板放电方式生成Kr亚稳态原子(Kr * ), 并通过吸收光谱法测得Kr * 密度为1.3×10 12 cm −3 . 2022年Zhang等 [14] 采用分区脉冲放电技术, 进一步扩大放电体积, 在 2×0.4 cm 3 放电区域内产生了10 13 cm −3 量级的亚稳态氩原子.…”

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Ar-Kr resonance energy transfer in He/Ar/Kr optically pumped rare gas laser medium

Shen,

Lei,

Wang

et al. 2023

Acta Phys. Sin.

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High metastable density is one of the research focuses of optically pumped rare gas laser(OPRGL). Considering that the Ar metastable state energy level is only 20 cm-1different from the Kr excited state 5p[3/2]2, argon gas is added to the He/Kr discharge system. Due to the long lifetime of the Ar metastable state atoms, through the collision resonance energy transfer process of Ar(4s[3/2]2)→Kr(5p[3/2]2), the purpose of supplementing and increasing the metastable density of Kr(Kr*) can be realized. In the case of obtaining the same metastable density, the pressure of the discharge power source is reduced, and a new idea is provided for further obtaining a high metastable density in a large discharge volume. In this paper, the experimental analysis is carried out from the perspectives of spectral diagnosis and measurement of metastable density by laser absorption spectroscopy. The results show that the peak of radiative transition line of Kr high energy level atoms participating in the collision to the metastable state energy level is significantly enhanced after adding argon, and the tail signal of the transition line is extended within one discharge cycle. Under the gas conditions of 100 mbar, 1% Kr and 12.5% Ar, the peak value of the spectral line can be enhanced by about 10 times, and the tail signal of the transition line can be extended from 0.6 ms to 14.25 ms. At the same time, the density of Kr metastable energy level atoms was measured under different Ar content. Under the gas conditions of 100 mbar,15% Ar and 1% Kr, the density of Kr* increased from 4.94×1011 cm-3 to 6.96×1012 cm-3. At low pressure, the absorption linewidth of Kr metastable atoms narrows with the increase of Ar content. Under the gas condition of 600 mbar and 1% Kr, when the content of Ar is increased to 5%, the peak density of Kr* increases from 4.69×1013 cm-3 to 5.79×1013 cm-3, an increase of 20%. Although the enhancement of metastable-atom-generation at high pressure is not as significant as those at low pressure, an increasing trend can still be observed. The results verify that the Kr metastable atoms generated in each discharge period can be supplemented by Ar-Kr resonance energy transfer.

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Section: Kr亚稳态原子数密度unclassified

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Ar-Kr resonance energy transfer in He/Ar/Kr optically pumped rare gas laser medium

Shen,

Lei,

Wang

et al. 2023

Acta Phys. Sin.

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Production of high-density metastable argon atoms with periodic fast pulsed DC discharge

Lei¹,

Shen²,

Wang³

et al. 2023

Opt. Express

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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 cm3 of He/Ar plasma at a pressure of 900 mBar, with a peak value of metastable argon density higher than 1014 cm-3 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.

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Demonstration of a metastable argon laser of 10 W by transverse pumping

Lei,

Chen,

Shen

et al. 2024

Opt. Lett.

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Optically pumped metastable rare gas lasers have been extensively investigated as promising high-energy lasers. These systems employ discharge-excited metastable inert gases as the lasing medium. Following optical pumping, a buffer gas, typically helium, is introduced to facilitate a collisional population transfer to the p2[1/2]1 level, thereby establishing population inversion. To date, laser outputs in the watt level have been demonstrated. However, further power scaling crucially depends on the ability to stably generate high metastable densities at elevated pressures approaching atmospheric conditions. In this Letter, we report a pulsed discharge technique based on a peaking capacitor rapid discharge circuit, which is capable of producing metastable particle densities exceeding 1014 cm−3 at pressures up to 900 mbar. By employing this discharge approach in conjunction with transverse optical pumping, we have realized a maximum output power of 12.5 W from a semiconductor-pumped metastable argon laser system.

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Segmented pulsed discharge for metastable argon lasing medium

Cited by 4 publications

References 27 publications

Ar-Kr resonance energy transfer in He/Ar/Kr optically pumped rare gas laser medium

Ar-Kr resonance energy transfer in He/Ar/Kr optically pumped rare gas laser medium

Production of high-density metastable argon atoms with periodic fast pulsed DC discharge

Demonstration of a metastable argon laser of 10 W by transverse pumping

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