Spatially-temporal dynamics of a passively Q-switched Raman-active solid-state oscillator

TL;DR

This paper presents a comprehensive spatial-temporal model of a passively Q-switched Raman-active solid-state oscillator, revealing how optimal parameter choices can control pulse shape and spatial distribution for improved performance.

Contribution

It introduces a non-Gaussian mode model for the oscillator and demonstrates how parameter optimization can regularize complex dynamics and enhance pulse characteristics.

Findings

Optimal parameters can regularize complex dynamics.

Pulse can be temporally squeezed and spatially broadened.

Model does not assume Gaussian mode shapes.

Abstract

The spatially-temporal model of an all-solid-state passively Q-switched oscillator with an active medium providing the stimulated Raman scattering is presented. The model does not presume a Gaussian shape of the cylindrically symmetric modes at both fundamental and Stokes wavelengths. It is found, that the highly-nontrivial spatially-temporal dynamics can be regularized by the optimal choice of the oscillator parameters, viz. initial transmission of a saturable absorber, curvature of a spherical mirror, and output mirror transmission at the fundamental and Stokes wavelengths. As a result, the pulse can be substantially temporally squeezed and spatially broadened at both fundamental and Stokes wavelengths.