Hannover 2010 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 55: Poster II

Q 55.76: Poster

Donnerstag, 11. März 2010, 16:00–19:00, Lichthof

Effects of counter-directional mode coupling in a cw PP LN SRO with ring resonator — Sergey Vasilyev¹, Stephan Schiller¹, •Hans-Emanuel Gollnick¹, Alexander Nevsky¹, Arnaud Grisard², and Juan Jiménez³ — ¹Heinrich-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.