Topological charge independent frequency conversion of twisted light

TL;DR

This paper introduces a novel image technique that makes second harmonic generation (SHG) efficiency independent of the topological charge of twisted light, potentially improving quantum information and nonlinear optics applications.

Contribution

The authors develop a method to eliminate the dependence of SHG efficiency on topological charges using a special image technique, enhancing fidelity in light-matter interactions.

Findings

SHG efficiency becomes independent of topological charge

Independence verified across various topological charges and pump powers

Method can be generalized to other light-matter interaction processes

Abstract

Light with orbital angular momentum (OAM), or twisted light, is widely investigated in the fields of optical communications, quantum information science and nonlinear optics by harnessing its unbounded dimension. For light-matter interacting with twisted light like quantum memory and nonlinear frequency conversion, efficiencies in these processes are usually decreasing exponentially with topological charges, which severely degrades the fidelity of the output states. Here we conceive and develop a method to eliminate the dependence of conversion efficiency on topological charges in second harmonic generation (SHG) process by utilizing a special designed image technique. The independence of SHG conversion efficiency on topological charge is verified for different topological charges, this independence is valid for various pump power. This method can be generalized to other light matter interaction processes and will revolute the field of light matter interaction with twisted light to achieve higher efficiency and higher fidelity.