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Fiber-based source of 500 kW mid-infrared solitons
Optics Letters ( IF 3.6 ) Pub Date : 2021-11-22 , DOI: 10.1364/ol.445235 I. Tiliouine , H. Delahaye , G. Granger , Y. Leventoux , C. E. Jimenez , V. Couderc , S. Février
Optics Letters ( IF 3.6 ) Pub Date : 2021-11-22 , DOI: 10.1364/ol.445235 I. Tiliouine , H. Delahaye , G. Granger , Y. Leventoux , C. E. Jimenez , V. Couderc , S. Février
Fiber-based sources delivering high-energy few-cycle pulses at high repetition rates are currently being developed in the near-infrared spectral range, thanks to the wide availability of telecommunication-grade optical fibers and components. Similar sources in the middle-wave infrared (mid-IR) spectral domain, however, are scarce, although such sources are of high interest for applications such as high-precision frequency metrology and molecular spectroscopy or as a seed source to reach further into the mid-IR via coherent nonlinear processes. Here we report on the design of a fiber-based source of 50-nJ energy 90 fs duration pulses up to 2950 nm, corresponding to 500 kW peak power. To obtain this level of peak power we exploit multi-solitonic fission and soliton self-frequency shift in large mode area fibers excited by picosecond pulses emitted at 2 µm from a megahertz repetition rate fiber laser. We leverage mature silica-based fiber technology up to 2.4 µm and restrict the use of fluoride fiber to the very last frequency-shifting stage. The level of instantaneous power and ultra-short duration achieved in this Letter pave the way to all-fiber format generation of an ultra-broadband coherent continuum in the mid-IR with profound implications for applications such as high-resolution molecular spectroscopy and imaging.
中文翻译:
基于光纤的 500 kW 中红外孤子源
由于电信级光纤和组件的广泛可用性,目前正在近红外光谱范围内开发以高重复率提供高能量少周期脉冲的基于光纤的光源。然而,中波红外 (mid-IR) 光谱域中的类似源很少,尽管此类源对于高精度频率计量学和分子光谱学等应用或作为种子源进一步深入中红外通过相干非线性过程。在这里,我们报告了基于光纤的 50-nJ 能量、90 fs 持续时间脉冲源的设计,该脉冲高达 2950 nm,对应于 500 kW 峰值功率。为了获得这种峰值功率水平,我们利用大模式面积光纤中的多孤子裂变和孤子自频移,这些光纤由兆赫重复率光纤激光器以 2 µm 发射的皮秒脉冲激发。我们利用成熟的硅基光纤技术,最大可达 2.4 µm,并将氟化物光纤的使用限制在最后的频移阶段。本信函中实现的瞬时功率水平和超短持续时间水平为在中红外中生成超宽带相干连续谱的全光纤格式铺平了道路,对高分辨率分子光谱和成像等应用具有深远意义。
更新日期:2021-12-02
中文翻译:
基于光纤的 500 kW 中红外孤子源
由于电信级光纤和组件的广泛可用性,目前正在近红外光谱范围内开发以高重复率提供高能量少周期脉冲的基于光纤的光源。然而,中波红外 (mid-IR) 光谱域中的类似源很少,尽管此类源对于高精度频率计量学和分子光谱学等应用或作为种子源进一步深入中红外通过相干非线性过程。在这里,我们报告了基于光纤的 50-nJ 能量、90 fs 持续时间脉冲源的设计,该脉冲高达 2950 nm,对应于 500 kW 峰值功率。为了获得这种峰值功率水平,我们利用大模式面积光纤中的多孤子裂变和孤子自频移,这些光纤由兆赫重复率光纤激光器以 2 µm 发射的皮秒脉冲激发。我们利用成熟的硅基光纤技术,最大可达 2.4 µm,并将氟化物光纤的使用限制在最后的频移阶段。本信函中实现的瞬时功率水平和超短持续时间水平为在中红外中生成超宽带相干连续谱的全光纤格式铺平了道路,对高分辨率分子光谱和成像等应用具有深远意义。