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采用光束并合的方法可以提高脉冲半导体激光器峰值功率以及远场光斑的均匀性,从而提高激光主动成像系统的作用距离,并实现系统的小型化。首先应用指数高斯光束传输模型推导了并合光束的远场能量分布,并采用Matlab仿真软件对影响光束并合效果的各激光器间轴线夹角、各激光器延迟时间以及并合激光器的间距等参数进行研究,最后进行光束并合实验,获得了1.5 km外目标的选通成像图像,对比了不同并合激光数目对成像性能的影响,验证了光束并合方法可以有效地改进成像质量。
The beam combining method can improve the peak power of the pulsed semiconductor laser and the uniformity of the far-field spot to improve the active distance of the laser active imaging system and realize the miniaturization of the system. Firstly, exponential Gaussian beam transmission model is used to derive the far-field energy distribution of the combined beam. Parameters such as the included angle between laser lasers and the lasers’ lasing time and the distance between laser lasers and other lasers are analyzed using Matlab software Finally, a beam combination experiment was carried out to obtain a gated image of a target at a distance of 1.5 km. The effect of the different number of combined laser beams on the imaging performance was compared. It was verified that the beam combining method can effectively improve the imaging quality.