Optical parametric oscillators (OPOs) are uniquely versatile—albeit complex—platforms for the generation of tunable coherent light in difficult-to-access spectral regions. A synchronously pumped ${\chi ^{(2)}}$ femtosecond OPO producing sub-100-fs pulses, by means of optical soliton formation in a single-mode fiber-feedback cavity, is presented for the first time. This approach removes the requirement for active stabilization and bulk dispersion compensation elements associated with traditional OPOs, while reducing the physical footprint by a factor of 3. Transform-limited pulses of 80–120 fs are generated for both normal and anomalous dispersion, while a new type of spectral sideband formation is observed and studied. Experimental results are supported by detailed simulations based on nonlinear pulse propagation theory, which serve to enrich the understanding of femtosecond pulse evolution in OPOs perturbed by strong Kerr nonlinearity. The OPO provides a unique platform for the study of intracavity soliton phenomena across a wide wavelength range.

中文翻译：

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光纤反馈光参量振荡器中的可调谐飞秒孤子产生

光学参量振荡器（OPO）具有独特的通用性（尽管很复杂）平台，用于在难以访问的光谱区域中生成可调相干光。同步抽水$ {\ chi ^ {（2）}} $首次提出了在单模光纤反馈腔中通过光孤子形成产生飞秒级OPO的飞秒OPO，其频率为100 fs。这种方法消除了对与传统OPO相关的主动稳定化和整体色散补偿元件的需求，同时将物理足迹减小了3倍。正常色散和异常色散均产生80–120 fs的变换限制脉冲，而新的观察和研究了光谱边带形成的类型。基于非线性脉冲传播理论的详细模拟为实验结果提供了支持，该模拟有助于丰富对强烈Kerr非线性扰动的OPO中飞秒脉冲演化的理解。OPO为研究宽波长范围内的腔内孤子现象提供了一个独特的平台。