激光束低频位相误差叠加规律研究
Research on the rule of laser beam’s low-frequency phase aberration superimposition
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摘要: 用随机位相屏模拟光学元件产生的低频位相误差，并用RMS位相梯度对低频位相误差进行统计量化，通过对激光束传输过程进行模拟，对低频位相误差的叠加规律有了新发现，并对位相误差叠加规律进行了修改，为位相校正提供了理论上的依据；通过对光束聚焦过程进行研究，得到了低频位相误差影响光束焦斑尺寸的初步规律；并在此基础上提出了一种光束质量控制的新方法。Abstract: With the low-frequency phase aberration caused by optics simulated by random phase plate and quantified with RMS phase gradient, the propagation of the beam is simulated. Something new is found with the rule of low-frequency phase aberration superimposition, so that the formula for the rule is modified, which is the theoretical foundation of phase aberration correction; the relationship between the focal spot size and RMS phase gradients is evident after simulating some focusing process. As a result, a kind of new method of controlling the beam quality is obtained.
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