Dual-wavelength mode-locked fiber lasers are considered as ideal solutions for fast, precise, and sensitive dual-comb spectroscopy. In this study, we present a self-started dual-wavelength fiber laser by combining a nonlinear amplifying loop mirror and a Lyot filter. Nonlinear phase accumulation, dual-wavelength competition, and crosstalk between the mode-locking mechanism and filtering effect are well addressed to realize the self-started dual-wavelength mode-locking. Furthermore, by temperature controlling the specific polarization-maintaining fiber, our dual-wavelength laser can be continuously tuned in a wavelength range of ∼6 nm, corresponding to a well-controlled repetition rates change of 80 Hz and their difference change of 30 Hz. Mutual coherence of the dual-wavelength pulses is demonstrated by detecting the multi-heterodyne beat notes and measuring the fluctuation of the repetition rate difference. Within 10 hours of measurement, the dual-wavelength repetition rates difference remains stable at 1180 Hz with an Allan deviation of ∼9 × 10 ⁻³ Hz @ 1s. By virtue of the all polarization-maintaining structure, our dual-wavelength laser shows improved long-term stability and repeatability, which will facilitate the turn-key, robust, and reproducible dual-comb spectroscopy for high-power or field applications.

中文翻译：

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具有良好控制重复率差的自启动双波长锁模

双波长锁模光纤激光器被认为是快速、精确和灵敏的双梳光谱的理想解决方案。在这项研究中，我们结合了非线性放大环形镜和Lyot滤光片，提出了一种自启动双波长光纤激光器。很好地解决了非线性相位累积、双波长竞争以及锁模机制与滤波效应之间的串扰，实现了自启动双波长锁模。此外，通过温度控制特定的保偏光纤，我们的双波长激光器可以在~6 nm 的波长范围内连续调谐，对应于 80 Hz 的良好控制重复率变化和 30 Hz 的差异变化。通过检测多外差拍音和测量重复率差异的波动来证明双波长脉冲的相互相干性。在测量的 10 小时内，双波长重复率差异在 1180 Hz 下保持稳定，艾伦偏差为 ∼9 × 10 ⁻³ Hz @ 1秒。凭借全保偏结构，我们的双波长激光器显示出更高的长期稳定性和可重复性，这将有助于高功率或现场应用的交钥匙、稳健和可重复的双梳光谱。