平顶高斯光束通过光阑-透镜分离系统的焦移

Focal shifts of flattened Gaussian beams passing through an aperture-lens separation system

为了对平顶高斯光束通过光阑-透镜分离光学系统轴上光强分布和焦移进行详细研究,采用Collins公式,通过数值计算,对各个参量对光强分布和焦移的影响进行了分析,得到了精确直观的解析式。结果表明,其光强分布和焦移不仅由平顶高斯光束的阶数N、光束的菲涅耳数F_w决定,还与光阑菲涅耳数F_a、光阑与透镜距离s有关。

In order to study the axial intensity distribution and focal shifts of flattened Gaussian beams （FGBs） passing through an aperture-lens separation system in detail, each parameter affecting the axial optical intensity distribution and focal shift were analyzed through numerical calculation based on Collins formula. It＇ s indicated that the axial intensity distribution and focal shift are not only determined by FGBs orders N and Fresnel number Fsv, but also effected by Fresnel number Fa of the aperture and aperture-lens distance s.