Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 40: Laserentwicklung: HL und nichtlineare Effekte

Q 40.3: Vortrag

Donnerstag, 15. März 2012, 11:00–11:15, V38.01

Widely tunable and compact optical parametric oscillator based on a whispering gallery mode resonatorMichael Förtsch1,2, Gerhard Schunk1,2, Florian Sedlmeir1,2, •Josef Fürst1,2, Christoffer Wittmann1,2, Dmitry Strekalov1,3, Harald G. L. Schwefel1,2, Christoph Marquardt1,2, and Gerd Leuchs1,21Max Planck Institute for the Science of Light, Erlangen, Germany — 2Institut für Optik, Information und Photonik, University of Erlangen-Nuremberg, Germany — 3Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA

We investigate a palm size and stable optical parametric oscillator (OPO) in a whispering gallery resonator (WGR), that simultaneously exhibits very low pump thresholds with versatile tunability. Offering small mode volume along with high quality factors, WGR are able to drastically enhance diverse nonlinear processes over the whole transparency range of the crystal material used. So far, we investigated a triply resonant, nondegenerate optical parametric oscillator in a crystalline WGR with its remarkable properties, one of them being the optical pump power threshold in the microwatts regime [1]. Along this line, we studied this OPO regarding its wavelength tunability. We observed a tunability of our naturally phasematched WGR of more than 100 nm, comparable to results from a periodically poled WGR [2]. Remarkably, we also witnessed mode-hop-free tuning of this triply resonant OPO within 200 MHz. [1] J. Fürst et al., PRL 105, 263904 (2010) [2] T. Beckmann et al., PRL 106, 143903 (2011)

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