Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster: Quantum Optics and Photonics III

Q 62.102: Poster

Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer

Frequency comb referenced narrow-linewidth mid-IR laser spectrometer for high-resolution molecular spectroscopy — •Michael Hansen, Evangelos Magoulakis, Qun-Feng Chen, Ingo Ernsting, and Stephan Schiller — Heinrich-Heine-Universität Düsseldorf

We demonstrate a novel source for high-resolution molecular spectroscopy, a continous-wave quantum cascade laser (QCL) stabilized to a ULE cavity and referenced to an optical frequency comb. The MIR laser wave (5.4 µm) is upconverted to 1.2 µm by sum-frequency generation in an orientation-patterned GaAs crystal with the output of a standard high-power cw 1.5 µm fiber laser and subsequent amplification of the sum-frequency wave. The 1.5 µm laser is phase-locked to a standard Er:fiber based frequency comb. The upconverted light at 1.2 µm is stabilized to a high-finesse ULE cavity by feed-back control of the QCL’s frequency.

Both the 1.5 µm and the 1.2 µm frequencies are simultaneously measured, and thus the frequency of the QCL can be calculated. Its frequency can be tuned by frequency tuning of the 1.5 µm wave.

Stabilization of the QCL to the ULE cavity results in sub-kHz linewidth and frequency determination with sub-kHz-level inaccuracy relative to an atomic frequency reference, in this case a hydrogen maser.