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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Investigation of laser output power saturation in the He-Cu+ IR hollow cathode discharge laser by experiments and numerical modeling
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Investigation of laser output power saturation in the He-Cu+ IR hollow cathode discharge laser by experiments and numerical modeling

机译：实验和数值模拟研究He-Cu + IR空心阴极放电激光器的激光输出功率饱和

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Saturation in the laser output power at high electrical currents is experimentally observed for a He-Cu+ IR HCD laser. To investigate which mechanisms might be responsible for the laser power saturation, a modeling network is developed for a helium-argon-copper hollow cathode discharge (HCD), and is applied to the conditions for which saturation is observed. Typical calculation results, such as the potential distribution, the densities of the various plasma species, the sputtering flux and the ionization degree of copper, are presented as a function of electrical current. The calculated densities of electrons, Cu atoms and Cu+ ions, as well as the sputtering flux and the ionization degree of copper, increase with electrical current, whereas the He+ ion density is found to be constant. The laser output power itself cannot yet be predicted by the model, due to insufficient knowledge about the relevant populating and depopulating processes of the upper and lower laser levels and the corresponding cross sections. However, the model can make predictions on the production of the upper laser level (by asymmetric charge transfer between Cu atoms and He+ ions). The latter is found to increase less rapidly with current at higher values of the electrical current, which is attributed to the rise in gas temperature at higher electrical currents. and it suggests a certain degree of saturation in the laser output power. However, full saturation in the production rate of the upper laser level was not obtained with our calculations. Hence, the observed laser power saturation at high currents is probably also due to (i) either increasing depopulation of the upper laser level, or (ii) increasing population of the lower laser level, resulting in a drop in the population inversion. [References: 14]
机译：对于He-Cu + IR HCD激光器，实验观察到了在高电流下激光器输出功率的饱和。为了研究哪些机制可能导致激光功率饱和，针对氦-氩-铜空心阴极放电（HCD）开发了一个建模网络，并将其应用于观察到饱和的条件。给出了典型的计算结果，例如电势分布，各种等离子体物质的密度，溅射通量和铜的电离度，它们是电流的函数。计算出的电子，Cu原子和Cu +离子的密度以及溅射通量和铜的电离度随电流的增加而增加，而发现He +离子的密度是恒定的。由于对上下激光水平和相应横截面的相关填充和填充过程的了解不足，因此模型尚无法预测激光输出功率本身。但是，该模型可以预测较高激光水平的产生（通过Cu原子和He +离子之间的不对称电荷转移）。发现后者在较高的电流值下随电流增加的速度较慢，这归因于较高电流下气体温度的升高。这表明激光输出功率有一定程度的饱和。但是，我们的计算并未获得较高激光水平的生产率的完全饱和。因此，在高电流下观察到的激光功率饱和也可能是由于（i）较高激光水平的人口减少，或（ii）较低激光水平的人口增加，导致了人口反转的下降。 [参考：14]

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