A theoretical model of amplified spontaneous emission with different beveling angles for disk-shaped laser medium

Abstract

This paper investigates the amplified spontaneous emission (ASE) effect in large-size, high-gain Yb:YAG disk lasers and proposes a theoretical model to suppress this effect using a beveled disk crystal. The Monte Carlo ray-tracing method analyzes the escape efficiencies of ASE photons with different escaping paths, revealing the function of the beveled disk crystal in suppressing the ASE effect. The results demonstrate that the beveling angle significantly impacts the escape efficiency and is closely related to the crystal's refractive index. This study provides theoretical support for designing a suitable beveling angle to compromise the ASE effect based on the refractive index of laser crystals and optimize the disk laser system in real-world applications.