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Humboldt-Universität zu Berlin - Faculty of Mathematics and Natural Sciences - Optical Systems

Humboldt-Universität zu Berlin | Faculty of Mathematics and Natural Sciences | Department of Physics | Optical Systems | Publications | Terahertz gas spectroscopy through self-mixing in a quantum-cascade laser

Till Hagelschuer, Martin Wienold, Heiko Richter, Schrottke Lutz, Klaus Biermann, Holger T Grahn, and Heinz-Wilhelm Hübers (2016)

Terahertz gas spectroscopy through self-mixing in a quantum-cascade laser

Applied Physics Letters.

We demonstrate the feasibility of high-resolution terahertz gas spectroscopy based on the external optical feedback effect in a quantum-cascade laser. Tuning the frequency of the quantum-cascade laser across a molecular absorption line of CH3OH leads to a reduction of the optical feedback, which can be detected by monitoring the voltage across the quantum-cascade laser. This method provides a high spectral resolution and a sensitivity comparable to that obtained with a cryogenically cooled Ge:Ga photoconductive detector.

Quantum Cascade Laser, Spectroscopy, Terahertz
Veröffentlichung im Rahmen der Helmholtz Research School on Security Technologies (HRSST)