# 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.

## Key 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.