发射系统遮拦比对均强聚焦光束光斑扩展的影响
Numerical analysis on the uniform focused beam spreading induced by atmosphere turbulence with different obscuring ratio
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摘要: 利用数值模拟方法讨论了发射系统遮拦比对均强聚焦光束湍流大气传输光斑扩展的影响。结果表明，对于均强聚焦光束湍流大气传输，在弱湍流效应条件下，光斑扩展受遮拦比影响较大；在较强湍流效应条件下，不同遮拦比光斑扩展变化趋势相同，此时远场光斑扩展主要还是受湍流效应强弱的影响。获得了常用遮拦比条件下均强聚焦光束光斑扩展和湍流效应特征参数的定标关系。Abstract: In this paper，numerical method was used to quantitatively calculate the limited uniformintensity focused beam spreading induced by atmospheric turbulence. The effect of obscuring ratio on the beam spreading was analyzed. The results show that the obscuring ratio has obvious influence on the beam spreading in weak turbulence. But when turbulence is strong， this influence can be neglected and the beam spreading is mainly determined by the intensity of turbulence effects. Moreover，the scaling relation between the beam spreading and the characteristic parameter described turbulence effects is derived.
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Key words:
- laser beam propagation /
- turbulence effects /
- beam spreading /
- obscuration
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