期刊论文

Focal shift of polychromatic Hermite-Gaussian beams in dispersion lens system

中文

激光技术

1001-3806

2019

43

3

406-410

10-7510/jgjs-issn-1001-3806-2019-03-022

国家自然科学基金资助项目(61404011) 湖南省自然科学基金资助项目(2015JJ3001).

本校为第一机构

为了了解带宽对厄米-高斯光束的聚焦特性和焦移的影响,采用衍射积分推导了TEM11模和TEM22模厄米-高斯光束通过受光阑限制色散透镜的传输公式,并利用数值计算对聚焦光强分布进行了研究,分析了带宽对两种模式焦移的影响。结果表明,TEM11模和TEM22模厄米-高斯光束的焦移量都会随带宽增大而增大,但两者的大小依赖相对带宽;当相对带宽小于0.25时,TEM22模焦移量大于TEM11模焦移量,然而相对带宽大于0.25时,后者会稍大于前者;带宽变化使TEM22模轴上光强主极大和次极大发生消长,从而引起轴上光强极大位置发生跃变。该研究结果对宽带厄米-高斯光束的应用具有一定的参考价值。

In order to know effect of bandwidth on the focused properties and focal shift of Hermite-Gaussian (H-G) beam, propagation formula of H-G beams passing through a dispersion lens system with polychromatic TEM11 mode and TEM22 mode was obtained by using diffraction integral. The focused intensity distribution was studied by numerical calculation. The effect of bandwidth on focal shift of both modes were analyzed. The results show that the focal shifts of H-G beams with TEM11 mode and TEM22 mode increase with the increase of the bandwidth and depend on the relative bandwidth. Focal shift of TEM22...