Teğin Uğur, Ortaç Bülend
Opt Lett. 2018 Apr 1;43(7):1611-1614. doi: 10.1364/OL.43.001611.
In this Letter, we demonstrate, to the best of our knowledge, the first all-fiber all-normal-dispersion ytterbium-doped oscillator with a nonlinear multimodal interference-based saturable absorber capable of generating ultrashort dissipative soliton pulses. Additional to functioning as a saturable absorber, the use of multimode fiber segments between single-mode fibers also ensures the bandpass filtering via multimode interference reimaging necessary to obtain dissipative soliton mode locking. The oscillator generates dissipative soliton pulses at 1030 nm with 5.8 mW average power, 5 ps duration, and 44.25 MHz repetition rate. Pulses are dechirped to 276 fs via an external grating compressor. All-fiber cavity design ensures high stability, and ∼70 dB sideband suppression is measured in the radio frequency spectrum. Numerical simulations are performed to investigate cavity dynamics, and obtained results are well matched with experimental observations. The proposed cavity presents an alternative approach to achieve all-fiber dissipative soliton mode locking with a simple and low-cost design.
在本信函中，据我们所知，我们展示了首个全光纤全正色散掺镱振荡器，其具有基于非线性多模干涉的可饱和吸收体，能够产生超短耗散孤子脉冲。除了用作可饱和吸收体之外，在单模光纤之间使用多模光纤段还通过多模干涉重成像确保了获得耗散孤子锁模所需的带通滤波。该振荡器在1030 nm处产生耗散孤子脉冲，平均功率为5.8 mW，脉宽为5 ps，重复频率为44.25 MHz。脉冲通过外部光栅压缩器被啁啾压缩至276 fs。全光纤腔设计确保了高稳定性，并且在射频频谱中测得边带抑制约为70 dB。进行了数值模拟以研究腔动力学，所得结果与实验观测结果良好匹配。所提出的腔提供了一种通过简单且低成本的设计实现全光纤耗散孤子锁模的替代方法。
