Wei Zhenshuai, Meng Jing, Huang Lu, Men Shaojie, Li Yulin, Zhao Zhigang, Cong Zhenhua, Liu Zhaojun
Opt Express. 2025 Mar 10;33(5):11944-11955. doi: 10.1364/OE.557223.
A watt-level, high-efficiency single-frequency distributed Bragg reflector (DBR) fiber laser emitting at 1941 nm was demonstrated using a Tm-doped yttrium aluminum garnet (Tm:YAG) crystal-derived silica fiber (TYCDSF). The TYCDSF, featuring a core doping concentration of TmO as high as ∼12.17 wt.% and a gain coefficient of 5.10 dB/cm at 1941 nm, was fabricated through the molten core method (MCM). By employing a 16-mm-long TYCDSF and in-band core pumping with a 1610 nm fiber laser, a stable single-frequency laser with a maximum output power of 1030 mW and a slope efficiency of 50.83% for absorbed pump power was achieved. The laser exhibited an optical signal-to-noise ratio exceeding 66.5 dB and a laser linewidth of approximately 40.75 kHz. To the best of our knowledge, this is the first demonstration of a watt-level single-frequency laser based on YAG crystal-derived silica fiber (YCDSF). Moreover, the slope efficiency achieved in this work is the highest reported for single-frequency lasers in the 2-μm band.
利用掺铥钇铝石榴石（Tm:YAG）晶体衍生的石英光纤（TYCDSF），展示了一种在1941nm波长发射的瓦级高效单频分布布拉格反射器（DBR）光纤激光器。通过熔芯法（MCM）制备的TYCDSF，其纤芯中TmO的掺杂浓度高达约12.17wt.%，在1941nm波长处的增益系数为5.10dB/cm。通过使用一根16mm长的TYCDSF，并采用1610nm光纤激光器进行带内纤芯泵浦，实现了一台稳定的单频激光器，其最大输出功率为1030mW，吸收泵浦功率的斜率效率为50.83%。该激光器的光信噪比超过66.5dB，激光线宽约为40.75kHz。据我们所知，这是首次展示基于YAG晶体衍生石英光纤（YCDSF）的瓦级单频激光器。此外，这项工作中实现的斜率效率是2μm波段单频激光器报道中最高的。
