Based on several centimeters long heavily Tm ³⁺ -doped germanate fibers (TGFs) and in-band-pumped technique, a short-wavelength distribute Bragg reflector (DBR) single-frequency fiber laser (SFFL) emitting at $1.7~\mu \text{m}$ is investigated experimentally. A stable single-longitudinal-mode laser output with a signal-to-noise ratio of greater than 60 dB and an operation wavelength of 1727 nm is realized. The maximum output power of 12.4 mW and the slope efficiency of 4.81% for the absorbed pump power are obtained from a 1.8-cm-long TGF pumped by a 1610 nm fiber laser. The measured relative intensity-noise of the SFFL reaches to around −130 dB/Hz at frequencies of over 10 MHz and the laser linewidth is 8.6 kHz. To the best of our knowledge, this is the first demonstration of the DBR Tm ³⁺ -doped SFFL with an operation wavelength in $1.7~\mu \text{m}$ region. It is suitable for optical coherence tomography, methane gas detection and optical medical technology.

中文翻译：

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波长为1.7的短波长带内泵浦单频DBR Tm ³⁺掺杂锗酸盐光纤激光器μ米

基于几厘米长的重 掺Tm ^3+的德国锗纤维（TGF）和带内泵浦技术，短波长分布布拉格反射器（DBR）单频光纤激光器（SFFL）发射出 $ 1.7〜\ mu \ text {m} $ 经过实验研究。实现了稳定的单纵模激光输出，其信噪比大于60 dB，工作波长为1727 nm。吸收的泵浦功率的最大输出功率为12.4 mW，斜率效率为4.81％，这是通过1610 nm光纤激光器泵浦的1.8厘米长的TGF获得的。在超过10 MHz的频率下，测得的SFFL的相对强度噪声达到-130 dB / Hz左右，并且激光线宽为8.6 kHz。据我们所知，这是DBR Tm ³⁺ 掺杂的SFFL的首次演示，其 工作波长为 $ 1.7〜\ mu \ text {m} $ 地区。适用于光学相干断层扫描，甲烷气体检测和光学医疗技术。