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Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 55: Poster II

Q 55.76: Poster

Thursday, March 11, 2010, 16:00–19:00, Lichthof

Effects of counter-directional mode coupling in a cw PP LN SRO with ring resonatorSergey Vasilyev1, Stephan Schiller1, •Hans-Emanuel Gollnick1, Alexander Nevsky1, Arnaud Grisard2, and Juan Jiménez31Heinrich-Heine Universität, Düsseldorf, Germany — 2Thales Research and Technology, Palaiseau Cedex, France — 3Universidad de Valladolid, Valladolid, Spain

The effects of coupling between clockwise and counterclockwise modes in a ring resonator with QPM nonlinear crystals are observed and investigated. We consider back reflection from the QPM grating as an important cause of the counter-directional mode coupling. We used computer simulation to demonstrate that the non-phase-matched back reflection from the QPM grating can be considerably enhanced due to grating imperfections. We developed an analytical model and evaluated parameters of the SRO in presence of the coupling. This is a parasitic effect, and results in increase of the SRO threshold. On the other hand, the asymmetry of coupled clockwise and counterclockwise modes can be used for active stabilization of the cavity. Described effects were observed experimentally. Measured properties are in good agreement with our analysis.

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