N. M. Al-Hosiny, A. A. El-Maaref, R. M. El-Agmy, “Mitigation of thermal effects in end pumping of Nd : YAG and composite YAG/Nd : YAG laser crystas, modelling and experiments”, Zhurnal Tekhnicheskoi Fiziki, 2021, Volume 91, Issue 8,Page 1268

This article is cited in 3 papers

Photonics

Mitigation of thermal effects in end pumping of Nd : YAG and composite YAG/Nd : YAG laser crystas, modelling and experiments

N. M. Al-Hosiny^a, A. A. El-Maaref^bc, R. M. El-Agmy^d

^a Department of Physics, College of Science, Taif University, P.O. Box 1109, Taif 21944, Saudi Arabia
^b Department of Physics, Collage of Science, Jouf University, P.O. Box 2014, Skaka, Saudi Arabia
^c Physics Department, Faculty of Science, Al-Azhar University, 71524 Assiut, Egypt
^d Department of Physics, Faculty of Science, Helwan University, 11792 Helwan, Cairo, Egypt

Abstract: 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 $\sim$ 35% and $\sim$ 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.

Keywords: Nd : YAG lasers, Thermal lens, Wavefront sensing, solid state lasers.

Received: 16.02.2021
Revised: 28.03.2021
Accepted: 04.04.2021

Language: English

DOI: 10.21883/JTF.2021.08.51103.38-21