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Q: Fachverband Quantenoptik und Photonik
Q 43: Poster II
Q 43.20: Poster
Mittwoch, 20. März 2013, 16:00–18:30, Empore Lichthof
Robust, frequency-stable and accurate mid-IR laser spectrometer in the 5 − 12 µ m spectral range based on combining QCLs and optical frequency metrology using upconversion in orientation-patterned GaAs — •Michael Hansen1, Ingo Ernsting1, Stephan Schiller1, Sergey Vasilyev1, and Arnaud Grisard2 — 1Heinrich-Heine-Universität Düsseldorf, Institut für Experimentalphysik, Universitätsstr. 1, 40225 Düsseldorf — 2Thales Research and Technology, France
We demonstrate a robust and simple method for measurement, stabilization and tuning of the frequency of cw mid-infrared (MIR) lasers, in particular of quantum cascade lasers, allowing implementation of flexible and "turn-key" spectrometers for a range of high-resolution spectroscopic tasks. The MIR laser wave is upconverted by sum-frequency generation in an orientation-patterned GaAs crystal with the output of a standard high-power cw 1.5 µ m fiber laser, subsequent amplification of the sum-frequency wave, Continuous measurements of this wave’s and the fiber laser’s frequency by a standard Er:fiber frequency comb provide signals allowing frequency control of the MIR laser. The proof of principle is performed with a quantum cascade laser at 5.4 µ m, which is upconverted to 1.2 µ m. The absolute QCL frequency is determined with 100 kHz-level inaccuracy relative to an atomic frequency reference. Frequency stabilization to sub-10 kHz level, controlled frequency tuning and long-term stability are demonstrated.