Broadband 1-GHz mid-infrared frequency comb.
Broadband 1-GHz mid-infrared frequency comb.
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DOI：
10.1038/s41377-022-00947-w
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发表时间：
2022-09-07
影响因子：
19.4
通讯作者：
Diddams, Scott
中科院分区：
文献类型：
--
作者：
Hoghooghi, Nazanin;Xing, Sida;Chang, Peter;Lesko, Daniel;Lind, Alexander;Rieker, Greg;Diddams, Scott
中红外（MIR）光谱仪是分子指纹和超光谱成像的宝贵工具。在现有的光谱方法中，GHz MIR双梳吸收光谱仪具有同时联合收割机结合高速、高光谱分辨率和宽光学带宽的潜力，这些特性是准确研究化学、燃烧和显微镜中复杂瞬态事件所需的。然而，这样的光谱仪还没有被证明，由于缺乏GHz的MIR频率梳与广泛和完整的频谱覆盖。在这里，我们介绍了第一个宽带MIR频率梳状激光器平台，重复频率为1 GHz，光谱覆盖范围为3至13 µm。该频率梳基于市售的1.56 µm锁模激光器、鲁棒的全光纤Er放大器和在χ（2）非线性晶体中产生几个周期脉冲的脉冲内差频（IP-DFG）。当用于双梳状光谱（DCS）配置时，该源将同时实现μs时间分辨率、1 GHz（0.03 cm−1）谱点间距和MIR大气窗口内任何位置>5 THz（>166 cm−1）全带宽的测量。这代表了一种独特的光谱资源，用于表征目前无法用其他来源获得的快速和非重复事件。
Mid-infrared (MIR) spectrometers are invaluable tools for molecular fingerprinting and hyper-spectral imaging. Among the available spectroscopic approaches, GHz MIR dual-comb absorption spectrometers have the potential to simultaneously combine the high-speed, high spectral resolution, and broad optical bandwidth needed to accurately study complex, transient events in chemistry, combustion, and microscopy. However, such a spectrometer has not yet been demonstrated due to the lack of GHz MIR frequency combs with broad and full spectral coverage. Here, we introduce the first broadband MIR frequency comb laser platform at 1 GHz repetition rate that achieves spectral coverage from 3 to 13 µm. This frequency comb is based on a commercially available 1.56 µm mode-locked laser, robust all-fiber Er amplifiers and intra-pulse difference frequency generation (IP-DFG) of few-cycle pulses in χ(2) nonlinear crystals. When used in a dual comb spectroscopy (DCS) configuration, this source will simultaneously enable measurements with μs time resolution, 1 GHz (0.03 cm−1) spectral point spacing and a full bandwidth of >5 THz (>166 cm−1) anywhere within the MIR atmospheric windows. This represents a unique spectroscopic resource for characterizing fast and non-repetitive events that are currently inaccessible with other sources.
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影响因子：
4.6
作者：
Abbas, Muhammad A.;Pan, Qing;Khodabakhsh, Amir
通讯作者：
Khodabakhsh, Amir
影响因子：
3.8
作者：
Draper, Anthony D.;Cole, Ryan K.;Rieker, Gregory B.
通讯作者：
Rieker, Gregory B.
影响因子：
3.4
作者：
Makowiecki, Amanda S.;Herman, Daniel, I;Rieker, Gregory B.
通讯作者：
Rieker, Gregory B.
影响因子：
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作者：
Nicholson, JW;Yan, MF;Veng, T
通讯作者：
Veng, T
影响因子：
35
作者：
Lesko, Daniel M. B.;Timmers, Henry;Diddams, Scott A.
通讯作者：
Diddams, Scott A.