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Optica Publishing Group
  • CLEO/Europe and EQEC 2009 Conference Digest
  • (Optica Publishing Group, 2009),
  • paper CD_P17

Degenerate multi-wave mixing inside the 4f coherent imaging system

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Abstract

We introduce a new contribution in the domain of experimental methods related to the nonlinear refraction characterization. By using different objects composed of different numbers of circular apertures at the entry of a 4f coherent imaging system [1] and matched field stops (blocking geometrical image of the object) at the output, we can obtain diffracted beams beyond the stop areas (Fig. 1 a, b, c, d, e) [2,3]. Presence of these beams is related to the intensity distribution pattern creating a combination of circular and sinusoidal gratings in the nonlinear material placed near the focal plane of focusing lens. The self-diffracted spectrum on this induced pattern generates diffracted beams appearing in the image plane. The three wave mixing process (three circular apertures at the entry) was combined with Z-scan technique [3] (see images shown in Fig. lc and Fig. le).

© 2009 IEEE

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