Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 60: Laser Applications I
Q 60.4: Vortrag
Freitag, 4. März 2016, 11:45–12:00, a310
Absolute frequency measurement and phase-locking of a THz quantum cascade laser with 10 GHz Ti:sapphire frequency combs — •Oliver Kliebisch1, Dirk Heinecke1, Thomas Dekorsy1, Hua Li2, Carlo Sirtori2, Giorgio Santarelli3, and Stefano Barbieri2 — 1Center for Applied Photonics, University of Konstanz, Konstanz — 2Laboratoire Matériaux et Phénomènes Quantiques, Universite Paris Diderot, France — 3Laboratoire Photonique, Numérique et Nanosciences, Université Bordeaux, France
Terahertz quantum cascade lasers (QCLs) play an important role as THz sources for high resolution spectroscopy [1] and frequency metrology. The challenge is to determine the absolute frequency of the QCL. With a dual-comb sampling technique using high repetition rate femtosecond lasers this can be accomplished without using additional frequency references for calibration. The QCL operates at 2.5 THz [2] and is injection locked at 9.72 GHz repetition rate. The femtosecond laser used for electro-optic sampling of the THz QCL electric field is a stabilized 10 GHz repetition rate Ti:sapphire laser [3] which is also used for phase locking the QCL by drive current modulation. Dual-comb spectroscopy is employed by sampling the phase-locked QCL with a second Ti:sapphire laser which is offset locked to the first Ti:sapphire laser. The two down-converted QCL spectra allow the determination of the absolute QCL frequency only limited by the stability and measurement precision of the RF beat mode. [1] L. Consolino et. al.. Nat. Commun., 3, 1040 (2012). [2] S. Barbieri, et. al., App. Phys. Lett 85 1674 (2004). [3] A. Bartels, et. al., Science, 326, 681 (2009).