Advanced DPAL modeling

B. Barmashenko, K. Waichman, Gilead Eliyahu-Caspi, G. Makov, S. Rosenwaks
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Abstract

Modeling of static K and Rb diode pumped alkali lasers (DPAL) and ion-electron recombination processes in these lasers is reported. The cases of He/CH4 and pure He buffer gases are investigated and the output power and optical efficiency calculated for various pump powers, mole fractions of methane, buffer gas pressures and flow velocities. The model considers the processes of excitation of high levels of K and Rb, ionization, ion-electron recombination and heating of electrons which affect the diffusion coefficient of K and Rb ions. It explains the experimentally observed sharp increase in power in static K DPAL caused by the addition of a few percent of methane to He buffer gas and its decrease with further increase in the methane percentage [B.V. Zhdanov et al, Opt. Exp. 25, 30793 (2017)]. The predictions of the model for different He/CH4 mixtures are presented and verified by comparing them with experimental results for K flowing-gas DPAL [A. J. Wallerstein, Ph.D. dissertation (Air Force Institute of Technology, 2018)] and with the calculated results obtained using a simplified three-level model based on one-dimensional gas dynamics approach reported by A. Gavrielides et al [J. Opt. Soc. Am. B 35, 2202 (2018)]. Calculations of potential energy curves of the 2 K + and 2 Rb + molecular ions and of the diabatic 1ε+, 3ε+, 1Δ, 3Δ, 1 Π 3Π, 1Φ and 3Φ valence states of 2 K + and 2 Rb + that provide the routes for dissociative recombination (DR of the ions are performed. These curves are required for subsequent calculations of DR rate constants. The excited states of K atoms produced by DR are 42P and 52P. Most of the Rb atoms produced by DR are in the 62P excited state. This conclusion contradicts the kinetic scheme for K and Rb DPAL proposed elsewhere, and thus the kinetic schemes of these DPALs should be modified according to the present results.
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高级DPAL建模
本文报道了静态K和Rb二极管抽运碱激光器(DPAL)的模型和这些激光器中的离子电子复合过程。研究了He/CH4和纯He缓冲气体的情况,计算了不同泵浦功率、甲烷摩尔分数、缓冲气体压力和流速下的输出功率和光效率。该模型考虑了影响K和Rb离子扩散系数的高能级K和Rb激发、电离、离子-电子复合和电子加热过程。它解释了实验观察到的静态K DPAL功率在He缓冲气中加入几个百分点的甲烷后急剧增加,并随着甲烷含量的进一步增加而下降的现象[B.V.]张建军,张建军,张建军,等[j].光子学报,2016,33(5):559 - 567。给出了模型对不同He/CH4混合物的预测结果,并与K流动气体DPAL [A]的实验结果进行了比较验证。J. Wallerstein,博士论文(Air Force Institute of Technology, 2018)],并使用a . Gavrielides等人报告的基于一维气体动力学方法的简化三层模型计算结果[J]。选择,Soc。点。[j].农业工程学报,2002,22(2018)。计算了2k +和2rb +分子离子的势能曲线,以及2k +和2rb +的非绝热价态1ε+、3ε+、1Δ、3Δ、1Π 3Π、1Φ和3Φ的势能曲线,为离子的解离重组(DR)提供了途径。这些曲线是以后计算DR速率常数所必需的。DR产生的K原子激发态为42P和52P。DR产生的Rb原子大多处于62P激发态。这一结论与其他文献提出的K和Rb DPAL的动力学方案相矛盾,因此这些DPAL的动力学方案应根据本研究结果进行修改。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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