Phase perturbation induced “hot image” and its variation
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摘要: 研究了具有位相扰动的激光束经过非线性介质后的传输情况,用数值模拟的方法着重研究了入射光强(这里以能量来反映)、调制深度、调制宽度等与热像的关系.研究结果表明,在某些条件下,即通常所说的共轭像面处,和振幅调制一样也可以看到明显的热像,但很多情况下其它一些地方峰值很强(例如棒后dO/2处),成为最值得关注的位置.光束演化(光场分布)对位相调制的深度反应较为敏感,某些深度的调制会有更大的危害性.另外,调制宽度、入射光强等对热像形成也有一定的影响.Abstract: Numerical simulation has been carried out to study the evolution of perturbed laser beam after passing through a piece of nonlinear medium.The variation of "hot image"with incident beam energy,modulation depth and modulation width have been studied.It has been concluded that:in some conditions,there can be a "hot image" at the ordinarily called "conjugated plane",but in other conditions,peak fluency density is very high at some places other than "conjugated plane".Phase modulation depth can deeply influence the evolution of the laser beam,and some kind of depth may induce more serious damage than others.In addition,modulation width and incident beam energy will also influence the distribution of the field.
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Keywords:
- optics /
- hot image /
- numerical simulation /
- nonlinear effect /
- phase modulation /
- phase perturbation
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