Wang Yafei, Wu Jiamin, Zhao Qilai, Wang Weiwei, Zhang Jing, Yang Zhongmin, Xu Shanhui, Peng Mingying
Opt Lett. 2020 Apr 15;45(8):2263-2266. doi: 10.1364/OL.386477.
We report a narrow linewidth and low threshold single-frequency distributed Bragg reflector (DBR) fiber laser at 1120 nm based on a short 1.5 cm long Nd-doped silica fiber which, to the best of our knowledge, is the first demonstration of a Nd-doped fiber-based single-frequency fiber laser with a wavelength greater than 1100 nm. A stable single-longitudinal-mode laser operation with a signal-to-noise ratio greater than 67 dB was verified by a scanning Fabry-Perot interferometer. The laser threshold is as low as 10 mW. The DBR fiber laser has a maximum output power of 15 mW and optical-to-optical efficiency for the launched pump power reaches more than 8%. The narrow linewidth of 71.5 kHz is obtained in such a single-frequency fiber laser (SFFL). Our result is expected to offer an exciting new opportunity to realize high-performance SFFLs above 1100 nm.
我们报道了一种基于1.5厘米长的短掺钕石英光纤的1120纳米窄线宽、低阈值单频分布布拉格反射镜（DBR）光纤激光器，据我们所知，这是首次展示波长大于1100纳米的基于掺钕光纤的单频光纤激光器。通过扫描法布里-珀罗干涉仪验证了具有大于67分贝信噪比的稳定单纵模激光运转。激光阈值低至10毫瓦。该DBR光纤激光器的最大输出功率为15毫瓦，对于注入泵浦功率的光到光效率超过8%。在这种单频光纤激光器（SFFL）中获得了71.5千赫兹的窄线宽。我们的结果有望为实现1100纳米以上的高性能SFFL提供一个令人兴奋的新机会。
