Berlin 2005 – wissenschaftliches Programm
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Q: Quantenoptik und Photonik
Q 68: Laserspektroskopie II
Q 68.2: Vortrag
Mittwoch, 9. März 2005, 11:15–11:30, HU 2014a
A Room-Temperature Distributed-Feedback cw Quantum Cascade Laser for Nitric Monoxide sensing — •Markus Horstjann1, Sven Thelen1, Dmitri Yarekha2, Jerome Faist2, Peter Hering1, and Manfred Mürtz1 — 1Institut für Lasermedizin, Universität Düsseldorf, www.ilm.uni-duesseldorf.de/tracegas. — 2University of Neuchatel, Ch-2000 Neuchatel, Switzerland.
Since the first successful demonstration of quantum cascade lasers (QCLs) in 1994, much work has been done in order to reduce the cooling requirement down to peltier-cooled operation. First cw, room-temperature operation of a λ = 9 µm QCL was shown from Beck et al in 2002, and one year later QCLs at λ = 5 µm with these properties became available [1]. This wavelength region can be used for high sensitive detection of nitric monoxide (NO), e.g. by using Faraday Modulation Spectroscopy (FAMOS). Utilizing the magnetic moment of NO, this method is free from any cross interferences, which enables the detection of NO released from liquids without any gas-pretreatment. This is especially interesting for biomedical and immunobiology purposes [2]. We present first experimental results achieved with a new λ = 5,4 µm distributed-feedback (DFB) cw QCL which can be operated up to 20∘C.
[1] D.A. Yarekha, M. Beck, S. Blaser, T. Aellen, E. Gini, D. Hofstetter, and J. Faist: Continuous-wave operation of quantum cascade laser emitting near 5.6 µm, Electronics Letters 39, 1123-1125 (2003).
[2] H. Ganser, M. Horstjann, C.V. Suschek, P. Hering, and M. Mürtz: Online monitoring of biogenic nitric oxide with a QC laser-based Faraday modulation technique, Appl. Phys. B 8, 513-517 (2004).