高功率激光装置中局部波前畸变的非线性传输
Nonlinear propagation of localized wavefront deformation in high-power laser facility
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摘要: 根据高功率激光装置中强激光束传输的特点，建立了描述光束通过光学元件时引入的局部波前畸变模型，并利用纹波传输的线性化处理方法，研究了带有局部波前畸变的高强度光束的传输规律。以一个连续的非增益激光介质为例，用该模型进行数值模拟，给出了不同空间尺度的局部波前畸变的频谱分布、不同空间频率的纹波引起的振幅非线性增长曲线、不同B积分的非线性增益随光束传输距离的变化曲线,光束振幅非线性增益达到最大时光束的传输距离和标准传输距离不同时由局部波前畸变引入的振幅分布。研究表明为了防止光学元件损坏，应避免光学元件表面出现半径为0.5~2.0 mm的局部瑕疵。Abstract: A theory model which describes the localized wavefront deformation of the optics elements is set up. The propagation regularity of the high-power plane-wave in the optics elements with localized wavefront deformation is investigated by linearization method of the ripple propagation. A continuous laser medium as an example is simulated with the model, and the spectral distribution clue to the localized wavefront deformation with different scales, the nonlinear gain of the amplitude clue to wave-front ripple with differen frequency, the relationship between the nonlinear gain and the beam transmission distance in the case of different B integral, the transmission distance where there exists the largest nonlinear gain of the output beam amplitude, and the amplitude distribution by the localiz
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