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Q: Fachverband Quantenoptik und Photonik

Q 28: Laser Development I

Q 28.4: Vortrag

Mittwoch, 2. März 2016, 11:45–12:00, a310

High-repetition rate, high-power femtosecond difference frequency generation behind an OPO for the mid-infrared fingerprint region — •Joachim Krauth, Tobias Steinle, Andy Steinmann, and Harald Gießen — 4th Physics Institute and Research Center SCoPE

We demonstrate a high power, femtosecond optical parametric oscillator (OPO) based on periodically poled lithium niobate crystal used for pumping a subsequent difference frequency generation (DFG) setup based on an AgGaSe₂ crystal. The linear cavity OPO generates up to 1.33 W (signal) and 1.63 W (idler) output power while it is synchronously pumped by a Yb:KGW oscillator that provides up to 7 W output power with 440 fs pulses at 41 MHz repetition rate at 1033 nm. The generated signal and idler are mixed in the DFG setup to generate as much as 150 mW in the mid-infrared (mid-IR) fingerprint region, with a tuning range between 4.9 and 7.3 µm. This stable, high power setup is useful for various applications including mid-IR spectroscopy. A complete characterization of the OPO and DFG stage along with power scaling, stability and mid-IR DFG spectral measurements will be presented.