摘要
根据Fraunhofer衍射理论,建立了基于相位调制的二维M×N激光相干阵列的远场光强分布理论模型。结合应用实际,对5×5激光相干阵列的远场光强分布进行数值模拟,分析了不同调制相位对远场光强分布的影响。结果表明,远场光强分布的主极大(小)的位置随调制相位变化,相对强度也随之变化;不同阵列结构,光强分布不同,每列(行)相邻两阵元上加载的相位差为π时,出现较多的主极大和次极大且对称分布。这些结果可为应用相位调制去控制远场光强分布提供有益的参考。
According to the Fraunhofer diffraction theory, a theoretical model of far-field intensity distribution of two-dimensional MX N laser coherent array based on phase modulation is established. Numerical simulation on far- field intensity distribution of a 5 × 5 laser coherent array aiming at the application practice is made and the influence of different phases on intensity distribution is also analyzed. The results show that the positions of the main maximum or minimum and the value of the intensity distribution change with the phase modulation, and the intensity distribution varies with different array structures. More symmetric main maxima and secondary maxima appear in the simulation results when the phase difference loaded in each column and each row is π. All of these provide a helpful reference for the control of far-field intensity distribution by phase modulation.
出处
《激光与光电子学进展》
CSCD
北大核心
2013年第3期109-114,共6页
Laser & Optoelectronics Progress
关键词
激光技术
相干光学
相干阵列
相位调制
远场光强分布
laser technique
coherent optics
coherence arrays
phase modulation
far-field intensity distribution
