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International Conference on Transparent Optical Networks

Optical parametric generation in purely nonlinear photonic crystals

Katia Gallo, Valdas Pašiškevičius, Fredrik Laurell

Published Jun 1, 2011• 0 citations
Publisher

Abstract

We demonstrate twin-beam parametric generation arising from the coherent locking of two resonances of a purely nonlinear lattice, implemented with hexagonally poled LiTaO3. The experiments provide a first example for the novel engineering capabilities affordable in frequency-downconversion with quadratic photonic crystals, to be exploited for novel parametric sources in classical and quantum optics.

DOI
10.1109/icton.2011.5971116

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We demonstrate twin-beam parametric generation arising from the coherent locking of two resonances of a purely nonlinear lattice, implemented with hexagonally poled LiTaO3. The experiments provide a first example for the novel engineering capabilities affordable in frequency-downconversion with quadratic photonic crystals, to be exploited for novel parametric sources in classical and quantum optics.
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Two-dimensional lattices of the optical nonlinearity implemented by periodic poling inχ(2)\chi^{(2)}χ(2)materials afford additional degrees of freedom for enhanced gains in optical parametric generation [1–2] and the generation of multipartite photon entanglement in compact device formats [3]. So far all investigations have considered single-frequency excitation of the crystals in classical or quantum parametric downconversion regimes. However, the effects underpinned by the coherent coupling of multiple nonlinear resonances unique to 2D lattices, may be expected to further enlarge the spectrum of possibilities also in suitably seeded coherent parametric amplification and difference frequency generation (DFG) processes.
nonlinear grating. A peculiar feature of this resonant configuration is that the two pumps simultaneously generate photon pairs over an entire branch of modes, via quasi-phase matching with both fundamental vectors of the reciprocal lattice of the nonlinearity. The parametric gain of these modes depends thus coherently on the sum of the two pump amplitudes and can be controlled by varying their relative intensities and phases. We find that a significant enhancement of the source conversion efficiency, comparable to that of one-dimensionally poled crystals, can be achieved by a dual symmetric pump. We also show how the four-mode coupling arising among shared modes at resonance can be tailored by changing the dual pump parameters.