Xie W, Tam S C, Lam Y L, Liu J, Yang H, Gu J, Tan W
Photonics Research Group, School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, S639798 Singapore.
Appl Opt. 2000 Oct 20;39(30):5482-7. doi: 10.1364/ao.39.005482.
A fraction of pump power has been converted to TEM00 mode laser power for a side-pumped solid-state laser by use of a space-dependent rate equation. We investigated the pump-to-mode (TEM00) ratio when scaling laser-diode side-pumped solid-state lasers to high-power levels by including the thermal effect in the space-dependent rate equation. Based on the assumption that Gaussian pump power is the same at any cross section of a laser rod, we resolved the output power with a space-dependent rate equation; temperature distribution in the laser rod was obtained; the optical path difference distribution was derived, and we estimated the diffraction losses that result from thermally induced spherical aberration by use of the Strehl intensity ratio. We determined that thermally induced diffraction losses are strongly dependent on pump power and on the pump-to-mode ratio.
通过使用与空间相关的速率方程，已将一部分泵浦功率转换为边泵浦固态激光器的TEM00模激光功率。我们通过在与空间相关的速率方程中纳入热效应，研究了将激光二极管边泵浦固态激光器扩展到高功率水平时的泵浦与模式（TEM00）比率。基于激光棒任何横截面上高斯泵浦功率相同的假设，我们用与空间相关的速率方程求解了输出功率；获得了激光棒中的温度分布；推导了光程差分布，并利用斯特列尔强度比估计了热致球差引起的衍射损耗。我们确定热致衍射损耗强烈依赖于泵浦功率和泵浦与模式比率。
