Mitigation of Thermal Effects in End Pumping of Nd:YAG and Composite YAG/Nd:YAG Laser Crystals, Modelling and Experiments

In this work, we have presented a finite element (FE) numerical modelling simulations to study and analyze the thermal effects in Nd:YAG and composite YAG/Nd:YAG laser rods. We have calculated the temperature distributions, stress intensity and thermal focal lengths at different pump powers for both...

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Bibliographic Details
Published in:Technical physics 2021-12, Vol.66 (12), p.1341-1347
Main Authors: Al-Hosiny, N. M., El-Maaref, A. A., El-Agmy, R. M.
Format: Article
Language:English
Subjects:
Analysis
Classical and Continuum Physics
Finite element method
Lasers
Neodymium lasers
Physics
Physics and Astronomy
Rods
Semiconductor lasers
Stress intensity
Temperature effects
Wave front sensors
Wave fronts
YAG lasers
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Summary:In this work, we have presented a finite element (FE) numerical modelling simulations to study and analyze the thermal effects in Nd:YAG and composite YAG/Nd:YAG laser rods. We have calculated the temperature distributions, stress intensity and thermal focal lengths at different pump powers for both rods. The FE simulations showed that using composite laser rod of undoped cap reduces the maximum value of stress intensity and thermal focal length by ∼35 and ∼50%, respectively. We have verified the FE calculations experimentally by direct measurement of focal length of thermally induced lens by using Hartmann–Shack wavefront sensor. Good agreement was obtained between FE calculations and experimental measurements.
ISSN:1063-7842
1090-6525
DOI:10.1134/S1063784221080028