Multiorder nonlinear diffraction in frequency doubling processes

Solomon M. Saltiel, Dragomir N. Neshev, Wieslaw Krolikowski, Ady Arie, Ole Bang, Yuri S. Kivshar
2009 Optics Letters  
We analyze experimentally light scattering from ͑2͒ nonlinear gratings and observe two types of secondharmonic frequency-scattering processes. The first process is identified as Raman-Nath type nonlinear diffraction that is explained by applying only transverse phase-matching conditions. The angular position of this type of diffraction is defined by the ratio of the second-harmonic wavelength and the grating period. In contrast, the second type of nonlinear scattering process is explained by
more » ... is explained by the longitudinal phase matching only, being insensitive to the nonlinear grating period.
doi:10.1364/ol.34.000848 pmid:19282953 fatcat:fulnbyzs55b7nhb4oc2qhhmcmq