Abstract

The anisotropic thermal lens effect of a dual-polarization Nd:YLF laser is experimentally investigated by measuring the transverse beat frequency between ${{\rm TEM}_{0,0}}$ and ${{\rm TEM}_{1,0}}$ modes in the self-pulsing operation, and focal lengths of thermal lensing for both polarizations can be accurately determined. The focal length of the thermal lens for $\pi$ polarization was observed to be negative and varies from ${-}{1.1}$ to ${-}{0.5}\;{\rm m}$ for the absorbed pump power increasing from 1.7 to 3.8 W. For $\sigma$ polarization, the focal length of the thermal lens was determined to be positive and varies from 1.2 to 0.9 m for the absorbed pump power increasing from 8.4 to 10.9 W. The sensitivity factors of the thermal lens for both polarizations were evaluated to be ${M_\pi} = - {0.54}\;{{\rm m}^{- 1}}/{\rm W}$ and ${M_\sigma} = {0.1}\;{{\rm m}^{- 1}}/{\rm W}$, respectively.

© 2020 Optical Society of America

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