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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。
According to the characteristics of strong laser beam transmission in high power laser devices, a local wavefront distortion model introduced when the light beam passes through the optical element is established. By using the linearization method of ripple transmission, the high wavefront distortion with local wavefront distortion Intensity beam transmission law. Taking a continuous non-gain laser medium as an example, the model was used for numerical simulation. The spectral distributions of local wavefront distortions at different spatial scales, amplitude nonlinear growth curves caused by different spatial frequency ripples, different B integrals Nonlinear gain with the beam transmission distance curve, the maximum nonlinear beam gain when the beam transmission distance and the standard transmission distance is different from the local wavefront distortion introduced amplitude distribution. Studies have shown that in order to prevent damage to the optical elements, local defects with a radius of 0.5 to 2.0 mm should be avoided on the surfaces of the optical elements.