Gaussian Content as a Laser Beam Quality Parameter

TL;DR

This paper introduces Gaussian Content as a new laser beam quality parameter, emphasizing its relevance for coherence-focused applications, with theoretical, computational, and experimental validation.

Contribution

It defines Gaussian Content, provides calculation methods, and demonstrates its application in beam combination and fiber coupling scenarios.

Findings

Gaussian Content can be measured and conserved during propagation

It effectively characterizes coherence properties of laser beams

Experimental results confirm theoretical predictions

Abstract

We propose the Gaussian Content as an optional quality parameter for the characterization of laser beams. It is defined as the overlap integral of a given field with an optimally defined Gaussian. The definition is specially suited for applications where coherence properties are targeted. Mathematical definitions and basic calculation procedures are given along with results for basic beam profiles. The coherent combination of an array of laser beams and the optimal coupling between a diode laser and a single-mode fiber (SMF) are elaborated as application examples. The measurement of the Gaussian Content and its conservation upon propagation are experimentally confirmed.