• Optical Instruments
  • Vol. 46, Issue 3, 87 (2024)
Bo ZHANG, Yuefei LI, Weilin CAO, Xiaojie HUANG..., Dawei ZHANG and Jianlang LI*|Show fewer author(s)
Author Affiliations
  • School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
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    DOI: 10.3969/j.issn.1005-5630.202303210071 Cite this Article
    Bo ZHANG, Yuefei LI, Weilin CAO, Xiaojie HUANG, Dawei ZHANG, Jianlang LI. Research on Nd∶YAG solid-state laser with extracavity rotatory pumping[J]. Optical Instruments, 2024, 46(3): 87 Copy Citation Text show less

    Abstract

    Thermal management in solid-state lasers is still a challenge in the development of high-energy laser systems. Introducing relative motion between the pump beam and the gain medium in the laser system is an efficient thermal management scheme. The temperature distribution of Nd∶YAG crystal was analyzed by means of finite element numerical simulation for static pumping, rotating gain medium pumping and pump-beam rotating pumping. Rotated at 800 r/min with standard heat-sinking cooling the disk temperature increased by only 16 ℃ reaching a maximum temperature of ~36 ℃, which is much lower than ~142 ℃ at static pumping. Experimentally, we designed and demonstrated a Nd∶YAG laser with the extracavity rotatory pumping, and obtained a 12.2 W output of 1064 nm with a slope efficiency of 37.2%, which is greater than the 35.1% at static pumping. The experimental results were coinciding with the theoretical simulation. The study shows that the solid state laser with extracavity rotatory pumping displays greatly enhanced thermal control.
    $ \rho c_{\mathrm{p}}\frac{\partial T}{\partial t}-K\left[\frac{\partial^2T}{\partial r^2}+\frac{1}{r}\frac{\partial T}{\partial t}+\frac{\partial^2T}{\partial\text{z}^2}\right]=q\left(r,\text{z}\right) $(1)

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    $ q\left( {r,{\textit{z}}} \right) = \gamma {P_0}p\left( {r,{\textit{z}}} \right)\frac{\alpha }{{1 - \exp \left( { - \alpha d} \right)}}\exp \left( { - \alpha {\textit{z}}} \right) $(2)

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    $ p\left( {r,{\textit{z}}} \right) = \frac{1}{{\pi \omega _{\textit{z}}^2}}\exp \left[ { - 2\left( {\frac{{{r^2}}}{{{\omega _{\textit{z}}}^2}}} \right)} \right] $(3)

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    $ \omega _{\textit{z}}^2 = \omega _0^2\left\{ {1 + {{\left[ {\frac{{{\lambda _{\rm{p}}}\left( {z - {z_0}} \right)}}{{\pi {n_0}\omega _0^2}}} \right]}^2}} \right\} $(4)

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    $ p(r,z)=1πωz2exp[2(r22rr0cos(φ2πtT)+r02ωz2)] $(5)

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    Bo ZHANG, Yuefei LI, Weilin CAO, Xiaojie HUANG, Dawei ZHANG, Jianlang LI. Research on Nd∶YAG solid-state laser with extracavity rotatory pumping[J]. Optical Instruments, 2024, 46(3): 87
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