畸变光束远场光强叠加特性研究

在远场将阵列激光的光强进行叠加是获取高功率激光输出的一种有效方法，由于激光在传输过程中会产生波前相位畸变，进而导致远场光强分布不匀滑。基于惠更斯-菲涅耳原理，建立了多束具有随机相位畸变的二维矩形阵列高斯光束非相干合成模型。模拟了光强合成过程远场焦斑的质量变化，计算了远场焦斑RMS和PSD与合成光束数量之间的关系。结果表明:光束非相干合成不仅能够有效提高激光的输出功率，还可以使畸变光束合成后的焦斑分布更加匀滑，提高光束的质量。

Irradiance superposition characteristic of distorted beams in far field

Irradiance superposition of laser array in far filed is an effective way to achieve output laser beam with high power and high beam quality. However, the wavefront of laser beams will distort in the process of transmission. Because of the distortion of wavefront, in the far-field the irradiance distributions are not smooth anymore. Based on the Huggens-Fresnel principle, the incoherent beams combination model of random phase distorted Gaussian beams with 2D rectangular symmetry array was established. The variation of far-filed focus quality in beams combination was simulated. The relationships between PSD as well as RMS in the far field and the number of combination beams were calculated. The analytical and numerical calculation results were given to illustrate that incoherent combination of Gaussian beams not only can raise the output power, but also improve the quality of output laser.