THIS: a tuneable heterodyne infrared spectrometer |
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| Authors: | Wirtz Daniel Sonnabend Guido Schieder Rudolf T |
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| Institution: | 1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China;2. Department of Materials Science, Fudan University, Shanghai 200433, China;1. Institute of Laser Physics SB RAS, Laboratory of IR Laser Systems, 15B, Ac. Lavrentieva Ave., Novosibirsk 630090, Russia;2. Institute of Laser Physics SB RAS, Laboratory of Laser Electronic Systems, 15B, Ac. Lavrentieva Ave., Novosibirsk 630090, Russia;1. Major in Materials Science, Graduate School of Science and Engineering, Ibaraki University, Hitachi, Ibaraki 316-8511, Japan;2. Nano ICT Laboratory, Advanced ICT Research Institute, NICT, Kobe, Hyogo 651-2492, Japan;3. Department of Mechanical Engineering, Graduate School of Engineering, Shizuoka University, Hamamatsu, Shizuoka 432-8011, Japan;1. Electronics and Electrical Communications Engineering Department, Faculty of Electronic Engineering, Menoufia University, Menouf 32951, Egypt;2. Department of Computer and Information Science (DCIS), Faculty of Science and Information Technology (FSIT), Universiti Teknologi Petronas (UTP), 32610 Seri Iskandar, Malaysia;3. Computational Optics Research Group, Advanced Institute of Materials Science, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;4. Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;1. Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, PR China;2. State Key Laboratory of Electronic Thin Film and Integrated Devices, School of Microelectronics and Solid-State Electronics, University of Electronic Science and Technology of China, Chengdu 610054, PR China;3. Department of Electronic and Electrical Engineering, University College London, Torrington Place, London WC1E 7JE, United Kingdom;4. Department of Electrical & Computer Engineering, University of Houston, Houston, TX 77204, USA |
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| Abstract: | With the Cologne Tuneable Heterodyne Infrared Spectrometer (THIS) we present a newly developed setup of a transportable heterodyne receiver. Competitiveness with regard to sensitivity, was reached for the first time with a semiconductor laser pumped system. Frequency tuneability of the local oscillator (LO) laser over a wide range of wavelengths is thus provided. This allows a variety of molecules, e.g. O3, NH3, CH4, N2O,.... in the earth's atmosphere, in planetary atmospheres or even in interstellar space to be observed with very high frequency resolution either from aboard the Stratospheric Observatory For Infrared Astronomy (SOFIA) or other ground based telescopes. Besides the good results with tuneable lead salt laser (TDL) operation there's room to improve: the power provided by such devices is not sufficient for a sensitivity close to the quantum limit. Therefore, first tests with recently developed high power quantum-cascade lasers (QCL) were carried out and further substantial improvement of the system noise temperature seems to be in reach. |
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