An optical fan for light beams for high-precision optical measurements and optical switching

TL;DR

This paper introduces a novel optical fan device that leverages polarization and orbital angular momentum properties of light, combined with thermal and electro-optical effects in birefringent crystals, for high-precision measurements and optical switching.

Contribution

It presents a new, simple, and robust scheme for rotating light beams using combined optical properties and effects, with high-resolution temperature and dispersion measurements.

Findings

Effective beam rotation achieved using birefringent crystals

High-resolution thermal dispersion measurement demonstrated

Opto-electronic switching implemented successfully

Abstract

The polarization and orbital angular momentum properties of light are of great importance in optical science and technology in the fields of high precision optical measurements and high capacity and high speed optical communications. Here we show, a totally new method, based on a combination of these two properties and using the thermal dispersion and electro-optical effect of birefringent crystals, the construction of a simple and robust scheme to rotate a light beam like a fan. Using a computer-based digital image processing technique, we determine the temperature and the thermal dispersion difference of the crystal with high resolution. We also use the rotation phenomenon to realize thermo-optic and electro-optic switches. The basic operating principles for measurement and switching processes are presented in detail. The methods developed here will have wide practical applicability in various fields, including remote sensing, materials science and optical communication networks.