ISSTT Proceedings

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Frequency Stabilization of a THz Quantum-Cascade Laser to a Molecular Absorption Line

Authors:
H. Richter, S. G. Pavlov, A. D. Semenov, L. Mahler, A. Tredicucci, H. E. Beere, D. A. Ritchie, H.-W. Hübers
Abstract:
The terahertz (THz) portion of the electromagnetic spectrum bears an amazing scientific potential in astronomy. High resolution spectroscopy in particular heterodyne spectroscopy of molecular rotational lines and fine structure lines of atoms or ions is a powerful tool, which allows obtaining valuable information about the observed object such as temperature and dynamical processes as well as density and distribution of particular species. One example is the OI fine structure line at 4.7 THz. This is a main target to be observed with GREAT, the German Receiver for Astronomy at Terahertz Frequencies, which will be operated on board of SOFIA. A major challenge for a heterodyne receivers operating at this frequency is the local oscillator (LO). THz quantum-cascade lasers (QCLs) have the potential to replace the presently used gas laser LO. A major issue is the frequency stabilization of the QCL, because its free-running linewidth is several MHz.
Categories:
Sources, Poster Session
Year:
2010
Session:
P9
Full-text:
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Page Number(s):
452