Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 63: Photonics IV
Q 63.4: Vortrag
Freitag, 22. März 2013, 14:45–15:00, F 128
Effect of Domain Shape on Noncollinear Second-Harmonic Emission in Disordered Quadratic Media — •Markus Passlick1, Mousa Ayoub1, Philip Roedig1, Kaloian Koynov2, Jörg Imbrock1, and Cornelia Denz1 — 1Institut für Angewandte Physik Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany — 2Max Planck Institut für Polymerforschung, 55128 Mainz, Germany
Nonlinear parametric processes are known to depend critically on phase matching between the phase velocities of the interacting waves. Phase matching is mostly achieved using conventional methods like crystal birefringence in homogeneous nonlinear optical media, or quasi-phase matching technique in periodically poled media. Recently, randomly structured multi-domain media have attracted a lot of interest for frequency conversion, because they allow a tunable phase-matched second-harmonic generation (SHG) practically in the whole transparency range of the crystal. However, these applications require adapted methods of phase matching. In this contribution, we study the role of the individual ferroelectric domain shape in SH emission in strontium barium niobate (SBN). The noncollinearly emitted SH signal is scanned in the far-field at different incident angles for different domain size distributions. This offers a possibility to retrieve the distribution of the Fourier coefficients, corresponding to the spatial domain distribution and the domain shape. Based on microscopic images of domain structures in SBN, domain patterns are simulated, the SH intensities are calculated, and finally compared with the measurements.