Mid-infrared optical frequency comb in the 2.7-4.0 μm range via difference frequency generation from a compact laser system
Mid-infrared optical frequency comb in the 2.7-4.0 μm range via difference frequency generation from a compact laser system
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通过紧凑型激光系统产生差频，实现 2.7-4.0 μm 范围内的中红外光学频率梳
DOI：
10.1017/hpl.2020.32
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发表时间：
2020
影响因子：
4.8
通讯作者：
Wenxue Li
中科院分区：
文献类型：
--
作者：
Lian Zhou;Yang Liu;Gehui Xie;Chenglin Gu;Zejiang Deng;Zhiwei Zhu;Cheng Ouyang;Zhong Zuo;Daping Luo;Bin Wu;Kunfeng Chen;Wenxue Li
报道了一种在2.7-4.0 μm波段可调谐的中红外频率梳，其最大平均输出功率为250 mW。该方法是基于单级差频产生（DFG）从一个紧凑的掺镱光纤激光器系统。近红外（NIR）梳的重复频率锁定在75 MHz。对无偏置中红外梳状系统重复频率的相位噪声进行了测量和分析。除了近红外梳齿的本征噪声外，低频环境噪声、放大链的高频量子噪声和非线性光谱展宽是导致梳齿线宽展宽的主要噪声源，限制了中红外双梳光谱的精度。
We report on the generation of a mid-infrared (mid-IR) frequency comb with a maximum average output power of 250 mW and tunability in the 2.7–4.0 μm region. The approach is based on a single-stage difference frequency generation (DFG) starting from a compact Yb-doped fiber laser system. The repetition rate of the near-infrared (NIR) comb is locked at 75 MHz. The phase noise of the repetition rate in the offset-free mid-IR comb system is measured and analyzed. Except for the intrinsic of NIR comb, environmental noise at low frequency and quantum noise at high frequency from the amplifier chain and nonlinear spectral broadening are the main noise sources of broadening the linewidth of comb teeth, which limits the precision of mid-IR dual-comb spectroscopy.