Spiral bandwidth of four-wave mixing in Rb vapour

被引：49

作者：

Offer, R. F. ^{[1
]}

Stulga, D. ^{[1
]}

Riis, E. ^{[1
]}

Franke-Arnold, S. ^{[2
]}

Arnold, A. S. ^{[1
]}

机构：

[1] Univ Strathclyde, SUPA, Dept Phys, Glasgow G4 ONG, Lanark, Scotland

[2] Univ Glasgow, SUPA, Sch Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland

来源：

COMMUNICATIONS PHYSICS | 2018年 / 1卷

基金：

英国工程与自然科学研究理事会;

关键词：

ORBITAL ANGULAR-MOMENTUM; FREQUENCY-UP-CONVERSION; LIGHT; GENERATION; CAVITY; COHERENT;

D O I：

10.1038/s42005-018-0077-5

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Laguerre-Gauss beams, and more generally the orbital angular momentum of light (OAM) provide valuable research tools for optical manipulation, processing, imaging and communication. High-efficiency frequency conversion of OAM is possible via four-wave mixing in rubidium vapour. Conservation of the OAM in the two pump beams determines the total OAM shared by the generated light fields at 420 nm and 5.2 mu m-but not its distribution between them. Here we experimentally investigate the spiral bandwidth of the generated light modes as a function of pump OAM. A small pump OAM is transferred almost completely to the 420 nm beam. Increasing the total pump OAM broadens the OAM spectrum of the generated light, indicating OAM entanglement between the generated light fields. This clears the path to high-efficiency OAM entanglement between widely disparate wavelengths.

引用

页数：8

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