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Thermal Stress Analysis of a Continuous and Pulsed End-Pumped Nd:YAG Rod Crystal Using Non-Classic Conduction Heat Transfer Theory

  • General and Applied Physics
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Abstract

In this paper, temperature distribution in the continuous and pulsed end-pumped Nd:YAG rod crystal is determined using nonclassical and classical heat conduction theories. In order to find the temperature distribution in crystal, heat transfer differential equations of crystal with consideration of boundary conditions are derived based on non-Fourier’s model and temperature distribution of the crystal is achieved by an analytical method. Then, by transferring non-Fourier differential equations to matrix equations, using finite element method, temperature and stress of every point of crystal are calculated in the time domain. According to the results, a comparison between classical and nonclassical theories is represented to investigate rupture power values. In continuous end pumping with equal input powers, non-Fourier theory predicts greater temperature and stress compared to Fourier theory. It also shows that with an increase in relaxation time, crystal rupture power decreases. Despite of these results, in single rectangular pulsed end-pumping condition, with an equal input power, Fourier theory indicates higher temperature and stress rather than non-Fourier theory. It is also observed that, when the relaxation time increases, maximum amounts of temperature and stress decrease.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Golpayegan University of Technology, Golpayegan, Iran

    Mahdi Mojahedi & Hamidreza Shekoohinejad

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  1. Mahdi Mojahedi
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  2. Hamidreza Shekoohinejad
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Correspondence to Mahdi Mojahedi.

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Mojahedi, M., Shekoohinejad, H. Thermal Stress Analysis of a Continuous and Pulsed End-Pumped Nd:YAG Rod Crystal Using Non-Classic Conduction Heat Transfer Theory. Braz J Phys 48, 46–60 (2018). https://doi.org/10.1007/s13538-017-0538-4

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  • DOI: https://doi.org/10.1007/s13538-017-0538-4

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