无衍射Bessel及Bessel-Gauss光的理论与实验

The Theory and Experiment of Diffraction-Free Bessel and Bessel-Gauss Beams

理论分析Bessel光束和Bessel-Gauss光束的相互联系及区别,数值模拟理想Bessel光束和Bessel-Gauss光束在任意平面的径向光强分布,以及光腰半径和谐振腔腔长对输出Bessel-Gauss光束的影响.模拟结果表明,相对于Bessel光,Bessel-Gauss光衰减较快,实验结果也验证了理论分析.同时,光腰半径越大,光强的径向分布衰减越慢;而腔长越大,其主模式的振幅分布衰减越慢.

This article makes theoretical analysis on the relationship and distinction between Bessel and Bessel-Gauss beams, the optical intensity distribution at any propagation plane of ideal Bessel beam and the Bessel-Gauss beam, and the effect of the beam waist and the cavity length L on the Bessel-Gauss beam were simulated. The simulation showed that Bessel-Gauss beam attenuated faster than that of the Bessel beam, and experimental result validated with the analysis. The simulation also pointed out that the larger the beam waist, the slower the radial optical intensity attenuate; the longer the cavity, the slower the amplitude of the dominant mode at output mirror is.