All-fiber frequency comb at 2 µm providing 1.4-cycle pulses.
All-fiber frequency comb at 2 µm providing 1.4-cycle pulses.
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DOI：
10.1364/ol.391486
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发表时间：
2020-02
期刊：
影响因子：
3.6
通讯作者：
Sida Xing;A. Kowligy;D. Lesko;A. Lind;S. Diddams
中科院分区：
文献类型：
--
作者：
Sida Xing;A. Kowligy;D. Lesko;A. Lind;S. Diddams
我们报告了一种产生2 μ m亚2周脉冲的全光纤方法和相应的八倍频光频梳。我们的配置利用成熟的1.5 μ m铒光纤激光技术，为掺铥光纤放大器提供种子脉冲，以100 MHz的重复频率输出330 mW的平均功率。放大后，光纤中的非线性自压缩将脉冲持续时间降低到9.5 fs，即1.4光周期。超短脉冲的频谱范围从1到超过2.4 μ m，可以直接测量载波包络偏移频率。我们的方法仅采用市售的光纤组件，从而使设计易于在更大的社区中复制。因此，该系统可作为近红外的鲁棒频率梳源，或作为产生中红外频率梳的泵浦源。
We report an all-fiber approach to generating sub-2-cycle pulses at 2 µm and a corresponding octave-spanning optical frequency comb. Our configuration leverages mature erbium:fiber laser technology at 1.5 µm to provide a seed pulse for a thulium-doped fiber amplifier that outputs 330 mW average power at a 100 MHz repetition rate. Following amplification, nonlinear self-compression in fiber decreases the pulse duration to 9.5 fs, or 1.4 optical cycles. The spectrum of the ultrashort pulse spans from 1 to beyond 2.4 µm and enables direct measurement of the carrier-envelope offset frequency. Our approach employs only commercially available fiber components, resulting in a design that is easy to reproduce in the larger community. As such, this system should be useful as a robust frequency comb source in the near-infrared or as a pump source to generate mid-infrared frequency combs.