Print Email Facebook Twitter High-resolution heterodyne spectroscopy using a tunable quantum cascade laser around 3.5 THz Title High-resolution heterodyne spectroscopy using a tunable quantum cascade laser around 3.5 THz Author Ren, Y. Hovenier, J.N. Higgins, R. Gao, J.R. Klapwijk, T.M. Shi, S.C. Klein, B. Kao, T.Y. Hu, Q. Reno, J.L. Faculty Applied Sciences Department QN/Quantum Nanoscience Date 2011-06-09 Abstract A frequency tunable terahertz heterodyne spectrometer, based on a third-order distributed feedback quantum cascade laser as a local oscillator, has been demonstrated by measuring molecular spectral lines of methanol (CH3OH) gas at 3.5 THz. By varying the bias voltage of the laser, we achieved a tuning range of ? 1?GHz of the lasing frequency, within which the molecular spectral lines were recorded. The measured spectra show excellent agreement with modeled ones. By fitting we derived the lasing frequency for each bias voltage accurately. The ultimate performance of the receiver including the resolution of noise temperature and frequency is also addressed. Subject measurement by laser beamquantum cascade lasersspectrochemical analysisterahertz spectroscopy To reference this document use: http://resolver.tudelft.nl/uuid:211ffd18-8a1b-4072-b8b7-6ffeb0435ee7 DOI https://doi.org/10.1063/1.3599518 Publisher American Institute of Physics ISSN 0003-6951 Source http://link.aip.org/link/doi/10.1063/1.3599518 Source Applied Physics Letters, 98 (23), 2011 Part of collection Institutional Repository Document type journal article Rights © 2011 The Author(s)American Institute of Physics Files PDF Ren_2011.pdf 432.92 KB Close viewer /islandora/object/uuid:211ffd18-8a1b-4072-b8b7-6ffeb0435ee7/datastream/OBJ/view