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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 1: Whispering Gallery Mode Resonators I

KFM 1.2: Hauptvortrag

Montag, 12. März 2018, 10:00–10:30, EMH 025

Whispering gallery optical parametric oscillators — •Ingo Breunig — Department of Microsystems Engineering - IMTEK, University of Freiburg, Georges-Köhler-Allee 102, 79110 Freiburg, Germany — Fraunhofer Institute for Physical Measurement Techniques IPM, Heidenhofstraße 8, 79110 Freiburg, Germany

Continuous-wave optical parametric oscillators (cw OPOs) combine narrow-linewidth emission with a large wavelength tuning range far beyond that of lasers. Conventionally, these devices are based on a nonlinear-optical crystal surrounded by a mirror cavity.

In whispering gallery optical parametric oscillators (WGR OPOs), light is guided by total internal reflection in a spheroidally-shaped millimeter-sized nonlinear-optical crystal. They provide oscillation thresholds in the (sub)-mW range. However, WGR OPOs are intrinsically triply-resonant. One might assume that wavelength tuning of is much more difficult to control here compared with that of conventional mirror-based singly-resonant systems.

Nevertheless, several experimental studies revealed that the output wavelengths of whispering gallery optical parametric oscillators can be tuned in well-defined steps over hundreds of nanometers by temperature variation and mode-hop-freely to MHz-wide resonances of alkali atoms. WGR OPOs are operated in a spectral range from wavelengths below 600 nm to ones beyond 8000 nm. Thus, these light sources - despite of their intrinsic triple resonance - might serve as compact and wavelength flexible devices for various applications.