Title :
High-frequency modulation spectroscopy with a THz quantum-cascade laser
Author :
Eichholz, R. ; Richter, H. ; Wienold, M. ; Schrottke, L. ; Grahn, H.T. ; Hubers, Heinz-Wilhelm
Author_Institution :
German Aerosp. Center (DLR), Berlin, Germany
Abstract :
A terahertz absorption spectrometer with a quantum-cascade laser (QCL) for high-resolution molecular spectroscopy is realized. The spectrometer is based on high-frequency (up to 50 MHz) modulation of the QCL frequency. This allows for the determination of the absorption coefficient and dispersion of the absorbing medium along with a very precise measurement of the line shape of the absorption feature. The design and performance of the spectrometer are presented, and its sensitivity and frequency calibration are discussed.
Keywords :
measurement by laser beam; quantum cascade lasers; terahertz spectroscopy; absorbing media; high frequency modulation spectroscopy; high resolution molecular spectroscopy; terahertz absorption spectrometer; terahertz quantum cascade laser; Absorption; Frequency measurement; Frequency modulation; Measurement by laser beam; Quantum cascade lasers; Spectroscopy;
Conference_Titel :
Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2013 38th International Conference on
Conference_Location :
Mainz
DOI :
10.1109/IRMMW-THz.2013.6665539
