Optoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ, UK.
Opt Lett. 2010 Feb 1;35(3):420-2. doi: 10.1364/OL.35.000420.
An efficient Ho:LuLiF(4) laser in-band pumped by a cladding-pumped Tm-doped silica fiber laser operating at 1937 nm is reported. At low-cavity output coupling, the Ho:LuLiF(4) laser yielded 5.1 W of output at a wavelength of 2066 nm for 8.0 W of absorbed pump power with a slope efficiency of 70%. At high-cavity output coupling, the lasing wavelength shifted to 2053 nm and the laser produced an output power of 5.4 W with a slope efficiency of 76%. The beam propagation factor (M(2)) was measured to be approximately 1.1 at the maximum output power confirming fundamental transverse mode (TEM(oo)) operation. The influence of resonator design on laser performance is discussed, along with prospects for further power scaling and improvement of the laser efficiency.
报道了一种高效的 Ho:LuLiF(4) 激光，它由工作在 1937nm 的包层泵浦 Tm 掺杂硅光纤激光器进行带内泵浦。在低腔输出耦合下，Ho:LuLiF(4)激光在 8.0W 吸收泵浦功率下，在 2066nm 波长处产生 5.1W 的输出，斜率效率为 70%。在高腔输出耦合下，激光波长移至 2053nm，激光输出功率为 5.4W，斜率效率为 76%。在最大输出功率时，光束传播因子（M(2)）测量约为 1.1，证实了基横模（TEM(oo)）的运转。讨论了腔设计对激光性能的影响，以及进一步提高功率和激光效率的前景。
