Opt Lett. 2018 Nov 1;43(21):5206-5209. doi: 10.1364/OL.43.005206.
A strictly all-fiberized, multi-watt 2-5-μm supercontinuum (SC) laser source with high conversion efficiency is presented. A broadband thulium-doped fiber amplifier with spectral coverage of 2-2.7 μm is used to pump a piece of single-mode fluoroindate (InF) fiber. A fusion-spliced joint with loss down to 0.07 dB is achieved between a piece of silica fiber and the InF fiber, which retains all-fiber structure and efficient pump power coupling. A 1.35-W SC with spectral coverage of 1.5-5.2 μm and a 4.06-W SC with spectral coverage of 1.9-5.1 μm are obtained with record conversion efficiencies of 59.5% and 63.3%, respectively. Furthermore, measured output power has a normalized root mean square superior to 0.4%, which indicates the excellent power stability of the system. This research, to the best of the authors' knowledge, demonstrates both record output power and record conversion efficiency of InF-fiber-based mid-infrared-SC laser sources to date. It is also the first report on strictly all-fiberized SC generation in InF fibers.
本文提出了一种严格全光纤化、多瓦数 2-5μm 超连续谱（SC）激光源，具有较高的转换效率。采用光谱覆盖范围为 2-2.7μm 的宽带掺铥光纤放大器来泵浦一段单模氟铟酸盐（InF）光纤。在一段石英光纤和 InF 光纤之间实现了损耗低至 0.07dB 的熔接拼接接头，保留了全光纤结构和高效的泵浦功率耦合。获得了光谱覆盖范围为 1.5-5.2μm 的 1.35W SC 和光谱覆盖范围为 1.9-5.1μm 的 4.06W SC，转换效率分别达到了 59.5%和 63.3%，均创纪录。此外，测量的输出功率具有归一化均方根优于 0.4%，这表明系统具有出色的功率稳定性。据作者所知，这项研究展示了迄今为止基于 InF 光纤的中红外 SC 激光源的输出功率和转换效率的新纪录。这也是 InF 光纤中严格全光纤化 SC 产生的首次报道。
