Optoelectronics Research Center, University of Southampton, Southampton, UK.
Opt Lett. 2012 May 1;37(9):1463-5. doi: 10.1364/OL.37.001463.
A simple method for simultaneously exciting the fundamental (TEM00) transverse mode and first order Laguerre-Gaussian (LG01) donut mode in an end-pumped solid-state laser to yield a quasi-top-hat output beam is reported. This approach has been applied to an Er:YAG laser, in-band pumped by an Er,Yb fiber laser, yielding 9.6 W of continuous-wave output at 1645 nm in a top-hat-like beam with beam propagation factor (M2)<2.1 for 24 W of incident pump power at 1532 nm. The corresponding slope efficiency with respect to incident pump power was 49%. The prospects of further scaling of output power and improved overall efficiency are considered.
报道了一种在端面泵浦固体激光器中同时激励基模（TEM00）横模和一阶拉盖尔-高斯（LG01）环形模，以获得准平顶输出光束的简单方法。该方法已应用于掺铒钇铝石榴石（Er:YAG）激光器，由掺铒、掺镱光纤激光器带内泵浦，在 1532nm 处输入 24W 泵浦功率时，在类似平顶的光束中产生 1645nm 处 9.6W 的连续波输出，光束传输因子（M2）<2.1。相对于输入泵浦功率的斜率效率为 49%。考虑了进一步提高输出功率和整体效率的前景。
