Abstract
Our anisotropic rate equation model outlines the relationship between the relaxation dynamics in a four-level solid-state laser and its anisotropic gain properties. Anisotropic pump rates and stimulated emission cross-sections were included to account for specific atom orientations in the gain material. The model is compared with experimental measurements of two relaxation oscillation frequencies which are related to the anisotropic atom-laser interaction in orthogonally polarized dual-mode lasers. The model predicts that crystal orientation and pump polarization affect the laser operation characteristics, as found experimentally. The gain anisotropy influences the fast laser dynamics, as in single-mode relaxation oscillations.
Highlights
Since the early days of lasers, rate equation models have been developed to explain experimental laser behavior
Our anisotropic rate equation model outlines the relationship between the relaxation dynamics in a four-level solid-state laser
stimulated emission cross-sections were included to account for specific atom orientations in the gain material
Summary
Since the early days of lasers, rate equation models have been developed to explain experimental laser behavior. While longitudinal mode coupling has been explained using spatial overlap between competing modes, we consider polarization-mode coupling in the context of gain anisotropy in diode-pumped Nd:YAG lasers [15,16,17], following the work of Otsuka [18] on effects such as emission cross-section and fluorescence properties in strongly anisotropic Nd lasers. His rate equation model and experiments showed dual-polarization oscillations [18]. Experimental results illustrating the validity of the model and weak anisotropic effects in (111)-cut Nd:YAG laser material are presented
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