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利用数值仿真的方法对激光系统进行研究时,一般使用理想的平面波或高斯波作为光源,而实际的激光传输系统光源通常不满足理想光束的条件,甚至具有恶劣的光束质量,从而造成仿真结果与实验结果存在很大的偏差。从波像差与光束β因子的关系出发,讨论了非理想光束的一种数值模拟方法。该方法使用等效相位屏作为光源的初始像差,等效相位屏的强度与待模拟光源的光束质量有关。将该方法分别应用到平面波和高斯波,根据给定的β因子仿真出光源的光场,然后计算光场的β因子并与设定值进行对比。结果表明:该方法可以准确的模拟出具有给定β因子的光源。
When using numerical simulation to study the laser system, the ideal plane wave or Gaussian wave is generally used as the light source, and the actual laser transmission system light source usually does not meet the ideal beam conditions, even with poor beam quality, resulting in simulation results and Experimental results there is a big deviation. Based on the relationship between wave aberration and beam β factor, a numerical simulation method of non-ideal beam is discussed. The method uses the equivalent phase screen as the initial aberration of the light source, and the intensity of the equivalent phase screen is related to the beam quality of the light source to be simulated. The method is applied respectively to plane wave and Gaussian wave, the light field of the light source is simulated according to the given β factor, then the β factor of the light field is calculated and compared with the set value. The results show that this method can accurately simulate a light source with a given β factor.