High-power operation of double-pass pumped Nd:YVO4 thin disk laser

Wei Wang; Di Sun; Xiao Du; Jie Guo; Xiaoyan Liang

doi:10.1017/hpl.2020.8

Journals >High Power Laser Science and Engineering >Volume 8 >Issue 1 >Page 01000e10 > Article

High Power Laser Science and Engineering
Vol. 8, Issue 1, 01000e10 (2020)

High-power operation of double-pass pumped Nd:YVO₄ thin disk laser

Wei Wang¹, Di Sun¹, Xiao Du¹, Jie Guo², and Xiaoyan Liang³

Author Affiliations

¹State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai201800, China

²State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai201800, China

³State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai201800, China

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DOI: 10.1017/hpl.2020.8 Cite this Article Set citation alerts

Wei Wang, Di Sun, Xiao Du, Jie Guo, Xiaoyan Liang. High-power operation of double-pass pumped Nd:YVO₄ thin disk laser[J]. High Power Laser Science and Engineering, 2020, 8(1): 01000e10 Copy Citation Text

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Abstract

A simple, compact, double-pass pumped Nd:YVO₄ thin disk laser is demonstrated. Its continuous-wave performance with different Nd doping concentrations and thicknesses is investigated experimentally. The maximum output power of 17.7 W is achieved by employing a 0.5 at.% doped sample, corresponding to an optical-to-optical efficiency of 46% with respect to the absorbed pump power. In addition, a numerical analysis and an experimental study of the temperature distribution, and thermal lens effect of the Nd:YVO₄ thin disk, are presented considering the influence of the energy transfer upconversion effect and the temperature dependence of the thermal conductivity tensor. The simulated results are in good agreement with the experimental results.

Keywords

energy transfer upconversion effect Nd:YVO4 thermal lens effect thin disk laser

$$\begin{eqnarray}K_{x}\frac{\unicode[STIX]{x2202}^{2}T}{\unicode[STIX]{x2202}x^{2}}+K_{y}\frac{\unicode[STIX]{x2202}^{2}T}{\unicode[STIX]{x2202}y^{2}}+K_{z}\frac{\unicode[STIX]{x2202}^{2}T}{\unicode[STIX]{x2202}z^{2}}+S(x,y,z)=0,\end{eqnarray}$$

(1)

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$$\begin{eqnarray}S(x,y,z)=\frac{\unicode[STIX]{x1D702}_{h}P_{\text{in}}\unicode[STIX]{x1D6FE}\unicode[STIX]{x1D6FC}e^{-\unicode[STIX]{x1D6FC}z}}{\unicode[STIX]{x1D70B}w_{p}^{2}(1-e^{-\unicode[STIX]{x1D6FC}L})}\unicode[STIX]{x1D6E9}(w_{p}^{2}-x^{2}-y^{2}),\end{eqnarray}$$

(2)

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$$\begin{eqnarray}\displaystyle & \displaystyle \left.-K_{z}\frac{\unicode[STIX]{x2202}T}{\unicode[STIX]{x2202}z}\right|_{z=l}=h[T(z=l)-T_{0}], & \displaystyle\end{eqnarray}$$

(3)

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$$\begin{eqnarray}\displaystyle & \displaystyle \left.-K_{z}\frac{\unicode[STIX]{x2202}T}{\unicode[STIX]{x2202}z}\right|_{z=-l^{\prime }}=h_{a}[T(z=-l^{\prime })-T_{a}], & \displaystyle\end{eqnarray}$$

(4)

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$$\begin{eqnarray}\text{OPD}(x,y)=2\int _{-l^{\prime }}^{l}\left[\frac{\unicode[STIX]{x2202}n}{\unicode[STIX]{x2202}T}+n_{0}(1+\unicode[STIX]{x1D710})\unicode[STIX]{x1D6FC}_{T}\right]\unicode[STIX]{x0394}T(x,y,z)\,\text{d}z,\end{eqnarray}$$

(5)

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$$\begin{eqnarray}\text{OPD}(x,y)=\text{OPD}_{0}-\frac{x^{2}+y^{2}}{R},\end{eqnarray}$$

(6)

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$$\begin{eqnarray}K=\left[\begin{array}{@{}ccc@{}}K_{ax}\displaystyle \frac{T_{a}}{T} & 0 & 0\\ 0 & K_{ay}\displaystyle \frac{T_{a}}{T} & 0\\ 0 & 0 & K_{az}\displaystyle \frac{T_{a}}{T}\end{array}\right],\end{eqnarray}$$

(7)

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$$\begin{eqnarray}\displaystyle \frac{\text{d}N_{\text{up}}}{\text{d}t}=W_{\text{up}}N_{3}^{2}-\frac{N_{\text{up}}}{\unicode[STIX]{x1D70F}_{\text{up}}}, & & \displaystyle\end{eqnarray}$$

(8)

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$$\begin{eqnarray}\displaystyle \frac{\text{d}N_{3}}{\text{d}t} & = & \displaystyle \frac{\unicode[STIX]{x1D706}_{p}\unicode[STIX]{x1D70E}_{\text{abs}}P_{\text{in}}}{hc\unicode[STIX]{x1D70B}\unicode[STIX]{x1D714}_{p}^{2}}N_{1}-\frac{N_{3}}{\unicode[STIX]{x1D70F}_{3}}\nonumber\\ \displaystyle & & \displaystyle -\,2W_{\text{up}}N_{3}^{2}+\frac{N_{\text{up}}}{\unicode[STIX]{x1D70F}_{\text{up}}}-\frac{N_{3}}{hc}\unicode[STIX]{x1D706}_{l}\unicode[STIX]{x1D70E}_{\text{ems}}I_{s},\end{eqnarray}$$

(9)

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$$\begin{eqnarray}\displaystyle & \displaystyle \frac{\text{d}N_{2}}{\text{d}t}=-\frac{N_{2}}{\unicode[STIX]{x1D70F}_{2}}+\unicode[STIX]{x1D6FD}_{32}\frac{N_{3}}{\unicode[STIX]{x1D70F}_{3}}+W_{\text{up}}N_{3}^{2}+\frac{N_{3}}{hc}\unicode[STIX]{x1D706}_{l}\unicode[STIX]{x1D70E}_{\text{ems}}I_{s}, & \displaystyle\end{eqnarray}$$

(10)

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$$\begin{eqnarray}\displaystyle & \displaystyle \frac{\text{d}N_{1}}{\text{d}t}=-\frac{\unicode[STIX]{x1D706}_{p}\unicode[STIX]{x1D70E}_{\text{abs}}P_{\text{in}}}{hc\unicode[STIX]{x1D70B}\unicode[STIX]{x1D714}_{p}^{2}}N_{1}+\unicode[STIX]{x1D6FD}_{31}\frac{N_{3}}{\unicode[STIX]{x1D70F}_{3}}+\frac{N_{2}}{\unicode[STIX]{x1D70F}_{2}}, & \displaystyle\end{eqnarray}$$

(11)

Wei Wang, Di Sun, Xiao Du, Jie Guo, Xiaoyan Liang. High-power operation of double-pass pumped Nd:YVO₄ thin disk laser[J]. High Power Laser Science and Engineering, 2020, 8(1): 01000e10

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