Abstract

We propose and experimentally demonstrate a colorful nonlinear Raman–Nath second-harmonic generation by engineering the quadratic nonlinearity χ(2) in an aperiodically poled lithium tantalite. The engineered nonlinear structure allows multicolored Raman–Nath second-harmonic signal outputs along a uniform direction, which cannot be achieved in a uniform nonlinear grating. The diffraction angles are independent of the beam waist and the position of incidence. This verifies that nonlinear Raman–Nath diffraction does not depend on the local superlattice structure where the fundamental frequency beam locates, but on the whole nonlinear χ(2) crystal.

© 2013 Optical Society of America

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