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arXiv 1904.03330physics.opticsphysics.app-ph
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采用自探测方案的紧凑实时太赫兹双梳光谱

Towards Compact and Real-Time Terahertz Dual-Comb Spectroscopy Employing a Self-Detection Scheme

Hua Li, Ziping Li, Wenjian Wan, Kang Zhou, Xiaoyu Liao, Sijia Yang, Chenjie Wang, J. C. Cao, Heping Zeng

摘要:

由于其快速和高分辨率的特点,双梳光谱吸引了越来越多的兴趣,因为它的第一个演示。在太赫兹频率范围内,丰富的吸收线(指纹)的分子位于,多外差光谱,采用双梳技术显示出优势,在实时光谱检测比传统的傅里叶变换红外或时域光谱。在这里,我们展示了紧凑的太赫兹双梳光谱的量子级联激光器(QCL)的基础上。在我们的实验中,两个自由运行的QCL产生大约120 GHz宽的梳状波,中心频率为4.2 THz,重复频率略有不同。我们观察到,$\sim$ 490 nW太赫兹功率耦合的一个激光器到其他足以激光自检测的双梳状谱,由微波频谱分析仪注册。此外,我们展示了实际的太赫兹传输双梳光谱与我们的设备,通过在室温下实施短的空气路径。光谱显示的半导体样品和潮湿的空气,后者允许快速监测的相对湿度。我们的设备应该很容易扩展到执行成像,显微镜和近场显微镜在太赫兹制度。

英文摘要:

Due to its fast and high resolution characteristics, dual-comb spectroscopy has attracted an increasing amount of interest since its first demonstration. In the terahertz frequency range where abundant absorption lines (finger prints) of molecules are located, multiheterodyne spectroscopy that employs the dual-comb technique shows an advantage in real-time spectral detection over the traditional Fourier transform infrared or time domain spectroscopies. Here, we demonstrate compact terahertz dual-comb spectroscopy based on quantum cascade lasers (QCLs). In our experiment, two free-running QCLs generate approximately 120 GHz wide combs centered at 4.2 THz, with slightly different repetition frequencies. We observe that $\sim$490 nW terahertz power coupling of one laser into the other suffices for laser-self-detecting the dual-comb spectrum that is registered by a microwave spectrum analyzer. Furthermore, we demonstrate practical terahertz transmission dual-comb spectroscopy with our device, by implementing a short air path at room temperature. Spectra are shown of semiconductor samples and of moist air, the latter allowing rapid monitoring of the relative humidity. Our devices should be readily extendable to perform imaging, microscopy and near-field microscopy in the terahertz regime.

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