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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 1: Whispering Gallery Mode Resonators I
KFM 1.5: Vortrag
Montag, 12. März 2018, 11:30–11:50, EMH 025
Mid-infrared whispering gallery optical parametric oscillators — •Yuechen Jia1, Kevin Hanka1, Karsten Buse1,2, and Ingo Breunig1,2 — 1Laboratory for Optical Systems, Department of Microsystems Engineering - IMTEK, University of Freiburg, Georges-Köhler-Allee 102, 79110 Freiburg, Germany — 2Fraunhofer Institute for Physical Measurement Techniques IPM, Heidenhofstraße 8, 79110 Freiburg, Germany
The mid-infrared (mid-IR) spectral window is of great interest because it allows for high-resolution spectroscopy of nearly all gas molecules. Whispering-gallery-resonator (WGR)-based continuous-wave optical parametric oscillators (CW OPOs), which combine high miniaturization and large wavelength tunability, are emerging as efficient frequency-conversion devices for applications in the mid-IR. Based on traditional nonlinear optical materials such as LiNbO3 or KTP, however, CW OPOs are limited to output wavelengths shorter than 5 μm due to the onset of multi-phonon absorption. In this contribution, we report about the fabrication of high-quality-factor whispering gallery resonators made out of AgGaSe2, CdSiP2 and orientation-patterned GaP crystals, which exhibit the highest nonlinear coefficients and broadest infrared transparency ranges among all practical nonlinear optical crystals. With these WGRs, additionally, CW OPOs with low oscillation thresholds and wide tunability in the mid-IR spectral range of 2-8 μm are realized.