Zhang Xin, Yang Changsheng, Huang Hengxiao, Wu Kaixuan, Wang Weichao, Zhang Qinyuan
Opt Express. 2025 Jun 30;33(13):27497-27505. doi: 10.1364/OE.565424.
We demonstrate a single-polarization single-frequency Yb-doped fiber laser operating at 1156 nm using a 10-m-long unpumped Yb-doped fiber (YDF) as a dynamic saturable absorber (SA). Leveraging spatial hole-burning-induced refractive index modulation, a self-adaptive Bragg grating with sub-MHz bandwidth is formed, enabling ultranarrow linewidth single-longitudinal-mode lasing. The linear cavity design with bidirectional pumping achieves an output power of 20.4 mW, > 65 dB optical signal-to-noise ratio, and <0.36% power instability. With a polarization extinction ratio of 22 dB, relative intensity noise below -139 dB/Hz (above 0.1 MHz), and a linewidth less than 10 kHz, this laser bridges the gap between long-wavelength operation and high coherence in Yb laser systems, offering a compact source for Yb optical clocks, dermatological therapy, and mid-infrared pump applications.
我们展示了一种单偏振单频掺镱光纤激光器，其工作波长为1156 nm，使用一段10米长未泵浦的掺镱光纤（YDF）作为动态饱和吸收体（SA）。利用空间烧孔引起的折射率调制，形成了带宽为亚兆赫兹的自适应布拉格光栅，实现了超窄线宽单纵模激光振荡。双向泵浦的线性腔设计实现了20.4 mW的输出功率、大于65 dB的光信噪比以及小于0.36%的功率不稳定性。该激光器的偏振消光比为22 dB，相对强度噪声低于-139 dB/Hz（高于0.1 MHz），线宽小于10 kHz，弥合了掺镱激光系统中长波长运行与高相干性之间的差距，为掺镱光学时钟、皮肤科治疗和中红外泵浦应用提供了一种紧凑的光源。
