Ji Shuaihao, Song Yingyi, Wang Zhongyu, Shen Chenyao, Lin Jiazhen, Xiao Bo, Feng Qichen, Du Qingyang, Xu Huiying, Cai Zhiping
Department of Electronic Engineering, Xiamen University, Xiamen, 361005, China.
Nanophotonics. 2022 Mar 14;11(8):1603-1609. doi: 10.1515/nanoph-2021-0763. eCollection 2022 Mar.
It has been a big challenge in decades for Ho-doped fiber laser to produce high emission power in deep-red due to its intrinsic long carrier lifetime in I energy level. Here, we advance the development of this visible fiber lasers by a novel pumping method that leverages the advantages of blue laser diode downconversion mechanisms to fully pumping, while shortening the lifetime of the lower energy level of the deep-red laser through excited state absorption. For the first time, we demonstrate a downconversion fiber laser using a single wavelength of 532 nm solid-state laser pump source to excite the Ho-doped ZBLAN fiber, which achieves a record high maximum output power of 1.64 W at 752.10 nm, as well as free-running of deep-red lasers with watt-level output. This technology represents a milestone in high power deep-red fiber lasers. Importantly, it is readily to be extended to other wavelengths that evidenced its huge application potentials in fiber laser industry.
由于掺钬光纤激光器在 I 能级具有固有的长载流子寿命，数十年来，实现深红色的高发射功率一直是一个巨大的挑战。在此，我们通过一种新颖的泵浦方法推动了这种可见光纤激光器的发展，该方法利用蓝光激光二极管下转换机制的优势进行充分泵浦，同时通过激发态吸收缩短深红色激光较低能级的寿命。我们首次展示了一种下转换光纤激光器，它使用单一波长的 532 nm 固态激光泵浦源来激发掺钬 ZBLAN 光纤，在 752.10 nm 处实现了创纪录的 1.64 W 最大输出功率，以及瓦级输出的深红色激光器自由运行。这项技术代表了高功率深红色光纤激光器的一个里程碑。重要的是，它很容易扩展到其他波长，证明了其在光纤激光行业的巨大应用潜力。
