双波长泵浦高双折射微结构石英光纤用于宽范围可调谐孤子自频移
Dual-wavelength pumped highly birefringent microstructured silica fiber for widely tunable soliton self-frequency shift
AI总结：
本研究设计了一种高双折射微结构石英光纤，支持1.04 μm和1.55 μm双波长泵浦，实现宽范围孤子自频移，覆盖光纤激光器难以达到的波长，用于多光子成像。
摘要：
我们报道了一种微结构石英基光纤的设计，用于宽范围可调谐的孤子自频移，适用于两种最常见的光纤激光波长泵浦：1.04 μm 和 1.55 μm。根据泵浦源的不同，在同一根 1.5 米长的光纤样品中，输出光谱可连续调谐至 1.67 μm（泵浦于 1.04 μm）或 1.95 μm（泵浦于 1.55 μm），泵浦至孤子的转换效率高于 20%。该光纤具有高双折射特性，使得孤子的偏振消光比达到 26 dB，性能优异。通过脉冲间干涉测量证实，频移后的孤子具有高度的相干性。可用的孤子调谐范围覆盖了光纤激光器无法达到的波长，例如 1.3 μm 和 1.7 μm，这对多光子显微镜和成像至关重要。我们的工作表明，可以设计和制造一种通用光纤，当用波长间隔超过 500 nm 的两种不同波长泵浦时，该光纤支持孤子频移。
英文摘要：
We report the design of a microstructured silica-based fiber for widely tunable soliton self-frequency shift, suitable for pumping with two most common fiber laser wavelengths: 1.04 μm and 1.55 μm. Depending on the pump source, the output spectrum can be continuously tuned up to 1.67 μm (pump at 1.04 μm) or 1.95 μm (pump at 1.55 μm) in the same 1.5 m-long fiber sample, with pump-to-soliton conversion efficiency higher than 20%. The fiber is highly birefringent, which results in an excellent polarization extinction ratio of the soliton, reaching 26 dB. The shifted solitons have a high degree of coherence confirmed by pulse-to-pulse interference measurement. The available soliton tuning range covers the wavelengths inaccessible for fiber lasers, e.g., 1.3 μm and 1.7 μm, highly important for multi-photon microscopy and imaging. Our work shows that it is possible to design and fabricate one universal optical fiber that supports soliton shift when pumped at two different wavelengths separated by over 500 nm.
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