Abstract
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 [1]. Recently, randomly structured multi-domain media have attracted a lot of interest for frequency conversion [2, 3]. In these media, the size of the domains is randomly distributed. This distribution, representing a set of reciprocal wave vectors [4], allows e.g. tunable phase-matched second-harmonic generation (SHG) practically in the whole transparency range of the crystal [2, 3]. Thus, when fundamental wave is propagating in such a medium, a noncollinear SH signal is expected everywhere in the plane of this disordered lattice. Hereon, different SH patterns in the far-field can be observed, if the domain size distribution is changed [5].
© 2013 IEEE
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