Measuring optical vortices by means of dual shearing-type Sagnac interferometers

TL;DR

This paper introduces a dual shearing-type Sagnac interferometer technique for precise measurement of optical vortices, enhancing accuracy across various vortex sizes and densities, especially in high-density conditions.

Contribution

It proposes a novel interferometer setup with adjustable shearing plates to improve measurement precision of optical vortices over a wide range of sizes and densities.

Findings

Enhanced measurement accuracy for high-density optical vortices

Adjustable shearing displacements optimize measurement performance

Effective observation of vortices with diverse sizes and densities

Abstract

Measuring the positions of optical vortices is an essential part in the researches of speckles and adaptive optics. The measurement accuracy is restricted by the performance of optical devices and the properties of optical vortices, such as density and size. In order to achieve high accuracy and wide range of application, the dual shearing-type Sagnac interferometers is proposed using two shearing plates to adjust the precision of optical vortices measurement. The shearing displacements are able to balance the measuring precision and the value of the intensity ratio point to provide optimum measurement performance. This method is useful for the observation of optical vortices with different sizes and densities, especially for the high density condition.