Focusing of partially coherent light by a graded-index lens

被引：2
|
作者：
Agrawal, Govind P. [1 ,2 ]
机构：
[1] Univ Rochester, Inst Opt, Rochester, NY 14627 USA
[2] Univ Rochester, Lab Laser Energet, Rochester, NY 14623 USA
来源：
OPTICS LETTERS | 2023年 / 48卷 / 02期
基金：
美国国家科学基金会;
关键词：
INTENSITY DISTRIBUTION; BEAM; PROPAGATION; POLARIZATION; STATE;
D O I：
10.1364/OL.481086
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We use coherence theory to study how the focusing of an opti-cal beam by a graded-index (GRIN) lens is affected when the incoming beam is only partially coherent. The Gaus-sian-Schell model is used to show that the intensity of a partially coherent beam exhibits self-imaging and evolves in a periodic fashion in a GRIN medium with a parabolic index profile. Spatial coherence of the beam affects a single parameter that governs how much the beam is compressed at the focal point. Our results show that the focal spot size depends on the fraction of the beam's diameter over which coherence persists. Focusing ceases to occur, and the beam may even expand at the focal point of a GRIN lens, when this fraction is below 10%.(c) 2023 Optica Publishing Group
引用
收藏
页码：436 / 439
页数：4
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