The common approach for quasi phase matching, using one dimensionally periodically poled or quasi periodically poled crystals, is to collinearly phase match the nonlinear interactions. In the collinear case, periodically poled crystals are usually used for phase matching one interaction while quasi periodically poled crystals can be used for phase matching several interactions. The possibilities in using non-collinear interactions with these structures have not been explored yet.

The objectives of my research work are to explore the possibilities of the non-collinear interactions for quasi phase matching. I am especially interested in application of non-collinear interactions for cascading of nonlinear interactions, optical parametric oscillators, all optical effects and ultra-short pulses.

We have already demonstrated the ability to generate simultaneous second harmonic and third harmonic of the pump wave in a one dimensionally periodically poled crystal1 (Fig 1a). In another experiment we have generated simultaneous cross polarized second harmonics of the pump wave (Fig 1b).

1. T. Ellenbogen, A. Arie, and S. M. Saltiel, “Noncollinear double quasi phase matching in one-dimensional poled crystals”, Opt. Lett. Vol. 32, No. 3, pp. 262-264 (2007). (pdf File)
2. T. Ellenbogen and A. Arie, “Applications of non-collinear second harmonic generation in one dimensional periodically poled crystal”, Optics Communications 277, 423-426 (2007) (pdf file)