Open AccessTheoretical analysis of thermal-lensing effect in a high power exciplex pumped Cs vapor laser
Author(s) -
Chenyi Su,
Xingqi Xu,
Jinghua Huang,
Bailiang Pan
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.434259
Subject(s) - optics , lens (geology) , refractive index , thermal , materials science , laser , thermal blooming , excimer laser , beam (structure) , focal length , physics , laser beams , thermodynamics
Considering the kinetic and fluid dynamic processes in the gain medium, a theoretical model is established to describe the mechanism of thermal-lensing effect in an exciplex pumped Cs vapor laser. The three-dimensional distribution of temperature and index of refraction in the gain medium are depicted. The effective focal length and radius of thermal lens are predicted. Our simulation results show the thermal lens plays a non-negligible role in high-power XPCsLs and can be significantly aggravated in higher wall temperature, buffer pressure and pump intensity. The divergence of laser beam influenced by thermal lens is also made in detail. This model is helpful for in-depth understanding of the thermal-lensing effect in XPALs.