Directly measuring mode purity of single component in superposed optical vortices

TL;DR

This paper introduces a robust self-interference method using phase-shifting technology to directly measure the mode purity of a single component in superposed optical vortices, achieving extremely high purity levels.

Contribution

The paper presents a novel, flexible, and robust technique for directly measuring mode purity in superposed optical vortices using phase-shifting self-interference.

Findings

Achieved mode purity of 99.997% in measurements.

Method is adaptable to various conditions and applications.

Provides a new way to evaluate optical vortex quality.

Abstract

Mode purity is an important reference for the quality of the optical vortex. In this work, we propose a self-interference method to directly measure single component in superposed optical vortices based on phase-shifting technology. This method has excellent flexibility and robustness, which can be applied to a variety of occasions and harsh conditions. Careful alignment and optimized error analysis allow us to generate and measure single component with mode purity as high as 99.997%.