Toward Compact and Real-Time Terahertz Dual-Comb Spectroscopy Employing a Self-Detection Scheme
- Hua Li*Hua Li*E-mail: [email protected]Key Laboratory of Terahertz Solid State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, ChinaCenter of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, ChinaMore by Hua Li,
- Ziping LiZiping LiKey Laboratory of Terahertz Solid State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, ChinaCenter of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, ChinaMore by Ziping Li,
- Wenjian WanWenjian WanKey Laboratory of Terahertz Solid State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, ChinaMore by Wenjian Wan,
- Kang ZhouKang ZhouKey Laboratory of Terahertz Solid State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, ChinaCenter of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, ChinaMore by Kang Zhou,
- Xiaoyu LiaoXiaoyu LiaoKey Laboratory of Terahertz Solid State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, ChinaCenter of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, ChinaMore by Xiaoyu Liao,
- Sijia YangSijia YangKey Laboratory of Terahertz Solid State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, ChinaCenter of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, ChinaMore by Sijia Yang,
- Chenjie WangChenjie WangKey Laboratory of Terahertz Solid State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, ChinaCenter of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, ChinaMore by Chenjie Wang,
- J. C. CaoJ. C. CaoKey Laboratory of Terahertz Solid State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, ChinaCenter of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, ChinaMore by J. C. Cao, and
- Heping ZengHeping ZengState Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, ChinaMore by Heping Zeng
Abstract
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 (fingerprints) 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 ∼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.
Cited By
This article is cited by 4 publications.
- Lukasz A. Sterczewski, Jonas Westberg, Yang Yang, David Burghoff, John Reno, Qing Hu, Gerard Wysocki. Terahertz Spectroscopy of Gas Mixtures with Dual Quantum Cascade Laser Frequency Combs. ACS Photonics 2020, 7 (5) , 1082-1087. https://doi.org/10.1021/acsphotonics.9b01758
- Andres Forrer, Martin Franckié, David Stark, Tudor Olariu, Mattias Beck, Jérôme Faist, Giacomo Scalari. Photon-Driven Broadband Emission and Frequency Comb RF Injection Locking in THz Quantum Cascade Lasers. ACS Photonics 2020, 7 (3) , 784-791. https://doi.org/10.1021/acsphotonics.9b01629
- Luigi Consolino, Malik Nafa, Michele De Regis, Francesco Cappelli, Katia Garrasi, Francesco P. Mezzapesa, Lianhe Li, A. Giles Davies, Edmund H. Linfield, Miriam S. Vitiello, Saverio Bartalini, Paolo De Natale. Quantum cascade laser based hybrid dual comb spectrometer. Communications Physics 2020, 3 (1) https://doi.org/10.1038/s42005-020-0344-0
- L. A. Sterczewski, M. Bagheri, C. Frez, C. L. Canedy, I. Vurgaftman, J. R. Meyer. Mid-infrared dual-comb spectroscopy with room-temperature bi-functional interband cascade lasers and detectors. Applied Physics Letters 2020, 116 (14) , 141102. https://doi.org/10.1063/1.5143954