Gebhardt F G
Appl Opt. 1976 Jun 1;15(6):1479-93. doi: 10.1364/AO.15.001479.
High power laser beams propagating in the atmosphere are subjected to a variety of effects, the most important of which are absorption, scattering, turbulence induced beam spreading and wander, thermal blooming, and gas breakdown. In this paper simplified models are used to show how the various atmospheric effects interrelate and impact on the best laser choice for high power applications through their dependence on the laser wavelength and temporal mode (e.g., cw or pulsed) of operation. Results for sea level propagation at seven common laser wavelengths varying from 0.34 microm to 10.6 microm. are presented that show the mid-ir wavelengths to be favored for typical turbulence and aerosol scattering conditions. At the longer 10.6-microm CO(2) laser wavelength thermal blooming is dominant due to stronger molecular absorption, while at the shorter wavelengths turbulence induced beam spreading and aerosol absorption and scattering effects become important and tend to limit the increase in irradiance expected on the basis of diffraction effects alone.
在大气中传播的高功率激光束会受到多种效应的影响，其中最重要的是吸收、散射、湍流引起的光束扩展和漂移、热晕以及气体击穿。本文使用简化模型来说明各种大气效应如何相互关联，并通过它们对激光波长和时间模式（例如连续波或脉冲）的依赖性，对高功率应用中最佳激光选择产生影响。给出了在海平面上七种常见激光波长（从0.34微米到10.6微米）下的传播结果，这些结果表明，对于典型的湍流和气溶胶散射条件，中红外波长更为有利。在较长的10.6微米二氧化碳激光波长下，由于较强的分子吸收，热晕占主导地位；而在较短波长下，湍流引起的光束扩展以及气溶胶吸收和散射效应变得很重要，并倾向于限制仅基于衍射效应所预期的辐照度增加。
