Abstract

In this Letter, we studied the near-field effect of the nonlinear Raman–Nath diffraction experimentally in a 1D periodically poled ${\mathrm{LiTaO}}_3$ crystal and established a theoretical relationship between the nonlinear effect in the near field and the corresponding effect in the far field. The interference of far-field spots in the near field constitutes the nonlinear Talbot self-imaging effect. Our results not only enhance our understanding of the nonlinear Talbot effect, but they also indicate potential applications of this effect in domain inspection and domain design.

© 2018 Optical Society of America

Nonlinear Raman–Nath diffraction of femtosecond laser pulses in a 2D nonlinear photonic crystal

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