论文标题
1-GHz中红外频率梳子跨度为3至13μm
1-GHz mid-infrared frequency comb spanning 3 to 13 μm
论文作者
论文摘要
中红外（miR）光谱仪是用于分子指纹和超光谱成像的宝贵工具。在可用的光谱方法中，GHz miR双弯曲吸收光谱仪具有同时结合高速，高光谱分辨率和宽阔的光学带宽，以准确研究化学，燃烧和显微镜和显微镜的复杂，瞬态事件所需的宽光带宽。但是，由于缺乏宽阔和全光谱覆盖的GHz miR频率梳子，因此尚未证明这样的光谱仪。在这里，我们以1 GHz的重复速率介绍了第一个宽带mir频率梳激光平台，该平台可实现3至13μm的光谱覆盖率。该频率梳子基于\ c {hi}（2）非线性晶体中几个循环脉冲的市售1.56μm模式锁定激光，强大的全纤维ER放大器和脉冲差的频率产生（IP-DFG）。当用于双梳光谱（DCS）配置中时，此源将同时使用μs时间分辨率，1 GHz（0.03 cm-1）的光谱点间距进行测量，并且在mir大气大气窗口内的任何地方的任何地方的频谱间距和完整的带宽> 5 thz（> 166 cm-1）。这代表了一种独特的光谱资源，用于表征当前与其他来源无法访问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 \c{hi}(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.
