共查询到18条相似文献,搜索用时 109 毫秒
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评述了脉冲放电激励的金属蒸气激光的发展历程和现状,根据激光发射过程,分别阐述了自终止跃迁激光和碰撞辐射复合激光的机理,报道了作者课题组最近在相关领域研究取得的新进展:包括共振-亚稳跃迁激光和复合激光的交替振荡现象,不同介质多谱线激光同时振荡现象以及碱土金属卤化物多谱线激光的实现和新发现的M-M跃迁激光。 相似文献
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Li Chen BangNing Mao YuBo Wang LiMing Wang BaiLiang Pan 《Optics Communications》2008,281(5):1211-1216
A self-consistent model has been developed to simulate the kinetics of alternate oscillation of self-terminating and recombination lasers in univalent ions of strontium excited by the high-repetition-rate (HRR) pulsed discharge. Photoelectric pulse waveforms predicted by the model are in good agreement with the experimental measurement. The model also gives temporal behaviors of long-life particles, the population densities of upper and lower laser levels and the electron temperature (Te) in He-Sr discharge plasma. The emission process of the two laser alternate oscillations, the characteristic of the laser pulse width and the population inversion mechanics are also analyzed. 相似文献
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Alternate oscillations of self-terminating and recombination lasers in univalent calcium and strontium ions 下载免费PDF全文
The univalent calcium and strontium ions have been confirmed as ideal lasing substances both for self-terminating laser and recombination laser by theoretically analysing their energy level structures and lasing mechanisms. With the optimization of the excitation circuit and the improvement of the laser cavity as well as the laser discharge tube, thealternate laser oscillatlons of the two laser mechanisms were suceessfully realized by longitudinal pulsed discharge in mixture vapours of helium and univalent ions of calcium or strontium, respectively. The dependences of laser performance on working parameters, together with the characteristics of the photoelectric pulse waveforms were elementally studied and analysed. 相似文献
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毛细管放电Z箍缩等离子体软X射线激光器近几年发展非常迅速,已经获得了在46.9nm的波长上近毫焦量级的激光输出,重复频率达到了4Hz.利用这种软X射线激光在等离子诊断、物质烧熔等方面已开展了初步的应用实验研究.文章介绍了毛细管放电泵浦的两种物理机制,阐述了类氖氩离子2p^53p^1S0-2p^53s^1P1能级间粒子数反转的形成及毛细管放电等离子体柱的演变过程.深入理解这些物理过程,对发展毛细管放电软X射线激光将起到积极作用。 相似文献
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The kinetic process of Sr atom metastable-metastable transition lasers in He-St longitudinal pulsed discharge is analysed and a concise self-consistent physical model is developed. The temporal evolutions of discharge parameters, main paxticle densities, the electron temperature, and the lasing pulses are numerically calculated. The results provided by the model agree well with the experiment, and the temporal behaviour of each laser pulse is explained successfully by the simulation results. 相似文献
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利用时间分辨的光谱测量技术,测定了XeCl紫外激光在不同条件下烧蚀金属Al诱导产生光谱线及其强度随时间的分布.结果表明:等离子体辐射光谱线由原子光谱线、一价离子光谱线及连续辐射背景光组成.Al原子光谱线的辐射强度与持续时间为最大,一价离子光谱线次之,以连续辐射背景光为最小.对激光烧蚀金属诱导发光的机理进行了探讨.等离子体中连续辐射背景光来自高能电子的韧致辐射和电子与离子的复合,原子光谱线和一价离子光谱线主要来自等离子体中电子与离子的复合.用此机理定性地解释了所观察到的实验现象.
关键词:
激光烧蚀
时间分辨光谱
辐射机理
金属Al 相似文献
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报道了放电引发的非链式HF(DF)激光器中的激活介质由电子碰撞负离子分离引起的电离非稳定性。这种非稳性出现在电极空间分离、脉冲CO2激光加热的基于sF6的混合气体的大体积放电中。实验研究了自引发体放电过程中由激光加热引起的放电等离子体的自组织现象以及由此在放电间隙的大部分区域形成的准周期等离子体结构。重点分析了等离子体结构随气体温度和注入能量的变化,讨论了等离子体自组织对电子碰撞分离不稳定性所产生的影响,解释了混合气体中由于电子碰撞使负离子消失导致的单等离子体通道移动的产生机理。 相似文献