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This research analyzes the impact of pump beam divergence on thermo-optical distortions in Nd:YAG crystals.

February 26, 2026Bulletin of the Lebedev Physics Institute0 citations

Thermo-Optical Distortions in Nd:YAG Crystals under Longitudinal Pumping with Divergence Taken into Account

AKA. L. KoromyslovP.N. Lebedev Physical Institute of the Russian Academy of Sciences KPK. V. ProkhorchukP.N. Lebedev Physical Institute of the Russian Academy of Sciences ITI. M. TupitsynP.N. Lebedev Physical Institute of the Russian Academy of Sciences

Key Points

This research analyzes the impact of pump beam divergence on thermo-optical distortions in Nd:YAG crystals.
Numerical analysis of Nd:YAG crystals under longitudinal diode pumping
Assessment of thermal lens behavior with varying pump power and focusing depth
Evaluation of pump beam divergence effects on optical characteristics
Thermal lens focal length increases by approximately 36% with pump beam divergence considered
Optical power of thermal lens increases by about 12% with a 1-2 mm increase in pump focusing depth
Divergence and focusing depth significantly influence thermo-optical distortion effects

Abstract

We report numerical analysis of the effect of pump divergence on thermo-optical distortions in an Nd:YAG crystal. Thermally induced distortions are shown to depend on the focusing depth, power, and divergence of the pump beam under longitudinal diode pumping. The focal length of a thermally induced lens increases by ∼36% when the pump beam divergence is taken into account. Increasing the pump focusing depth by 1–2 mm into the crystal leads to an increase in the optical power of the thermal lens by approximately 12%. The obtained results can be used in laser development.

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