Transient thermal analysis of Nd:YAG crystal end-pumped by pulsed diode laser

LI Long; DONG Wu-wei; NIE Jian-ping; LIU Xiao-jian; SHI Peng; XU Qi-ming

doi:10.3969/j.issn.1001-3806.2011.01.026

In order to study thermal effect of laser crystal end-pumped by pulsed laser diode, transient temperature field and thermal deformation field on the laser crystal were analytically investigated and calculated. Taking into account the outgoing light pulse LD with the super-Gaussian distribution and the Nd:YAG crystal isotropic heat conduction characteristics, the general analytical expressions of the transient temperature field and thermal deformation field of Nd:YAG crystal end-pumped by super-Gaussian distribution were obtained based on Poission equation of thermal conduction. The effect of the super-Gaussian pump light spot radius and super-Gaussian order times, pulse width on the transient temperature field of Nd:YAG crystal during the single-pulse-pumped and the quasi-thermal equilibrium temperature field of time-varying characteristics were quantitatively analyzed. The results show that when the LD end-pumped pulsed light has a third-order super-Gaussian distribution, the pump power is 80W, pulse frequency is 100Hz, pulse width is 200s, the mass fraction of neodymium-doped 0.01 Nd:YAG crystal transient temperature field with the pump pulse showing a periodic distribution, the quasi-thermal equilibrium the temperature of 25.5℃ to 29.2℃ into a zigzag shape between the distribution of the period. Crystal surface heat pump shape variables between 0.13m and 0.19m showing cyclical changes. The results have the theoretical instruction for designing the heat insensitive resonant cavity for the pulsed LD end-pumped all solid-state lasers.

Transient thermal analysis of Nd:YAG crystal end-pumped by pulsed diode laser

1. Faculty of Science, Xi' an University of Architecture & Technology, Xi' an 710055, China;

2. School of Materials Science and Engineering, Xi' an University of Architecture & Technology, Xi' an 710055, China

Received Date: 2010-03-23

Accepted Date: 2010-04-19

Available Online: 2011-01-25

Abstract: In order to study thermal effect of laser crystal end-pumped by pulsed laser diode, transient temperature field and thermal deformation field on the laser crystal were analytically investigated and calculated. Taking into account the outgoing light pulse LD with the super-Gaussian distribution and the Nd:YAG crystal isotropic heat conduction characteristics, the general analytical expressions of the transient temperature field and thermal deformation field of Nd:YAG crystal end-pumped by super-Gaussian distribution were obtained based on Poission equation of thermal conduction. The effect of the super-Gaussian pump light spot radius and super-Gaussian order times, pulse width on the transient temperature field of Nd:YAG crystal during the single-pulse-pumped and the quasi-thermal equilibrium temperature field of time-varying characteristics were quantitatively analyzed. The results show that when the LD end-pumped pulsed light has a third-order super-Gaussian distribution, the pump power is 80W, pulse frequency is 100Hz, pulse width is 200s, the mass fraction of neodymium-doped 0.01 Nd:YAG crystal transient temperature field with the pump pulse showing a periodic distribution, the quasi-thermal equilibrium the temperature of 25.5℃ to 29.2℃ into a zigzag shape between the distribution of the period. Crystal surface heat pump shape variables between 0.13m and 0.19m showing cyclical changes. The results have the theoretical instruction for designing the heat insensitive resonant cavity for the pulsed LD end-pumped all solid-state lasers.

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Reference (16)

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Transient thermal analysis of Nd:YAG crystal end-pumped by pulsed diode laser

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