Optimization in scaling fiber-coupled laser-diode end-pumped lasers to higher power: influence of thermal effect
Optimization in scaling fiber-coupled laser-diode end-pumped lasers to higher power: influence of thermal effect
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DOI：
10.1109/3.605566
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发表时间：
1997-08
影响因子：
2.5
通讯作者：
Yung-fu Chen;Ting-Kai Huang;C. Kao;Chi-Luen Wang;Shou-peng Wang
中科院分区：
文献类型：
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作者：
Yung-fu Chen;Ting-Kai Huang;C. Kao;Chi-Luen Wang;Shou-peng Wang
通过将热效应纳入空间相关速率方程分析，研究了光纤耦合激光二极管端面泵浦激光器放大到更高功率时的最佳模式泵浦比。在晶体端面绝热的假设下，导出了光程差（OPD）分布与泵浦光束质量、泵浦光聚焦位置和焦平面处泵浦半径的函数关系。由热致球差引起的衍射损失已被Strehl强度比估计。最佳模式泵浦比的本结果是显着不同，从以前的分析，其中忽略了热效应。这里，最佳模式-泵浦比是输入泵浦功率的递减函数，并且在稍高的泵浦功率的情况下小于1。实际的例子，Nd：YAG激光器泵浦的13瓦光纤耦合激光二极管被认为是证实我们的物理分析。
The optimum mode-to-pump ratio in scaling fiber-coupled laser-diode end-pumped lasers to higher power has been investigated by including the thermal effect into the space-dependent rate equation analysis. The optical path difference (OPD) distribution has been derived as a function of the pump-beam quality, focus position of pumping light, and pump radius at the focal plane under the assumption that the end faces of the crystal are thermally insulated. The diffraction losses arising from thermally induced spherical aberration have been estimated by the Strehl intensity ratio. The present results for the optimum mode-to-pump ratio are markedly different from previous analyses in which thermal effects are neglected. Here, the optimum mode-to-pump ratio is a decreasing function of input pump power, and is less than unity in the case of a slightly high pump power. The practical example of a Nd:YAG laser pumped by a 13-W fiber-coupled laser diode is considered to confirm our physical analysis.