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根据广义惠更斯-菲涅耳原理,对相干合成和非相干合成光束在湍流大气中的传输进行数值计算,并引入光束传输因子(BPF)用于评价合成光束的光束质量,对湍流大气对相干合成与非相干合成远场光束质量的影响进行定量分析。研究结果表明,在自由空间及强度较弱的湍流大气中传输时,相干合成光束在远场呈现多旁瓣的非高斯分布特征,与非相干合成光束相比具有峰值强度高的优势。但是随着湍流强度的增大,相干合成光束之间的相干性被破坏,相干合成光束的远场光强分布逐渐演化成与非相干合成的情形一致。定量计算结果表明,对于不同波长、不同数目的激光阵列,在较强的湍流大气中传输时,相干合成的光束质量与非相干合成光束质量相比均不占优势。计算模型和结果为工程实际中合成方案的选择和评估提供了参考。
According to the generalized Huygens-Fresnel principle, the propagation of coherent and incoherent synthetic beams in a turbulent atmosphere is numerically calculated, and the beam transmission factor (BPF) is introduced to evaluate the beam quality of the composite beams. Quantitative analysis of the effects of coherent synthetic and non-coherent synthetic far-field beam quality. The results show that non-Gaussian distribution features of multi-sidelobe in the far field when coherently combined beams propagate in turbulent atmosphere with less free space and less intensity, and have the advantage of high peak intensity compared with non-coherent synthesized beams. However, as the turbulence intensity increases, the coherence between the coherent composite beams is destroyed, and the far-field light intensity distribution of the coherent composite beams gradually evolves to be consistent with the non-coherent synthesis. Quantitative calculation results show that for different wavelengths and different numbers of laser arrays, the beam quality of the coherently synthesized laser beams is not dominant when compared with that of the non-coherent synthesized laser beams in the strong turbulent atmosphere. Computational models and results provide references for the selection and evaluation of synthetic schemes in engineering practice.