Quantitative measurement of the orbital angular momentum density of light

被引：35

作者：

Dudley, Angela ^{[1
,2
]}

Litvin, Igor A. ^{[1
]}

Forbes, Andrew ^{[1
,2
]}

机构：

[1] CSIR, Natl Laser Ctr, ZA-0001 Pretoria, South Africa

[2] Univ KwaZulu Natal, Sch Phys, ZA-4000 Durban, South Africa

来源：

APPLIED OPTICS | 2012年 / 51卷 / 07期

关键词：

POYNTING VECTOR; ORDER; SUPERPOSITIONS; STATES; BEAMS;

D O I：

10.1364/AO.51.000823

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

In this work we derive expressions for the orbital angular momentum (OAM) density of light, for both symmetric and nonsymmetric optical fields, that allow a direct comparison between theory and experiment. We present a simple method for measuring the OAM density in optical fields and test the approach on superimposed nondiffracting higher-order Bessel beams. The measurement technique makes use of a single spatial light modulator and a Fourier transforming lens to measure the OAM spectrum of the optical field. Quantitative values for the OAM density as a function of the radial position in the optical field are obtained for both symmetric and nonsymmetric superpositions, illustrating good agreement with the theoretical prediction. (C) 2012 Optical Society of America

引用

页码：823 / 833

页数：11

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