摘要
研究了子光源为基模高斯光束的相干阵激光光束的传输特性。通过理论模拟不同传输距离处光束横截面光强分布,同时分析主瓣与旁瓣峰值光强的比值随传输距离的变化规律,提出了无纲的相干阵激光普适性传输因子α。当0 <α<0.85时,随着a值不断增加,相干阵激光光束传输特性逐渐偏离Talbot效应,光束横截面光强极大峰数目逐渐变少;尤其是当α=0.85时,光束横截面中心位置出现光强峰值高于其他极大峰的主瓣;当0.85 <α<3π时,光束横截面的中心主瓣与旁瓣的峰值比逐渐增大,激光能量不断向主瓣集中;当α> 3π时,主瓣光强趋于稳定,主旁瓣峰值比的稳定值约21.5左右。
The propagation characteristics of coherent array laser beams with fundamental mode Gaussian beams are researched. The intensity distribution of beam cross-section at different transmission distances is simulated theoretically. At the same time, the ratio of peak light intensity between main lobe and side lobe changing with transmission distance is analyzed. Thus, a dimensionless coherent array laser universal transfer factor α is proposed. If 0<α<0.85, with the increasing of α, the beam propagation characteristics of coherent array laser gradually deviate from Talbot effect, and the number of maximum intensity peaks of beam cross-section gradually decreases.Especially, if α is equal to 0.85, the main lobe with the peak value of light intensity is higher than other maximum peaks appearing at the center of the beam cross-section. If 0.85<α<3π, the peak ratio between the central main lobe and the side lobe of the beam cross-section increases gradually, and the laser energy concentrates continuously to the main lobe. If α>3π, the light intensity of main lobe tends to be stable, and the peak ratio of main and side lobe is about 21.5.
作者
李尉
温丛阳
代京京
兰天
马淑芳
许并社
王智勇
LI Wei;WEN Cong-yang;DAI Jing-jing;LAN Tian;MA Shu-fang;XU Bin-she;WANG Zhi-yong(Institute of Advanced Semiconductor Optoelectronic Technology,Beijing University of Technology,Beijing,China;Materials Institute of Atomic and Molecular Science,Shaanxi University of Science and Technology,Xi'an,China)
出处
《光电技术应用》
2021年第4期28-32,共5页
Electro-Optic Technology Application
关键词
相干阵激光器
相干合成
光束光强分布
传输因子
coherent array laser
beam coherent combination
laser beam intensity distribution
transfer factor
