Precision measurement and determinations of laser radiation coherence by digital processing of their interferograms

TL;DR

This paper presents a digital method using a specialized interferometer and software algorithms to accurately measure the spatial and temporal coherence of various laser sources.

Contribution

It introduces a novel digital processing approach combined with a phase Bragg grating interferometer for laser coherence measurement.

Findings

Effective measurement of laser coherence for different laser types.

Demonstrated accuracy of digital processing in interferogram analysis.

Validated method with practical laser sources.

Abstract

The method of digital processing of laser radiation interference pattern with the digital microscope and original two-beam interferometer with the phase Bragg grating as the amplitude beam splitter for a quantitative determination of the spatial and temporary coherence module of radiation is described. The digital processing of the interference pattern images was carried out with known software algorithms. Principles and functionality of a measurement procedures are demonstrated on measuring of the radiation coherence of several gas, solid-state and diode lasers.