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(Color online) Schematics of the joint transform correlator geometry used for the implementation of the noncollinear THG correlator. The inset shows the ten THG beams generated when three noncollinear pulses coincide spatially and temporally in the NLO material along with the fundamental wave vector combinations that give rise to them.
Output images on three different positions of the output plane using the input 2D binary images indicated on the left of the table. The other figures demonstrate access to imaging through frequency conversion: , convolution: , and cross correlation: captured in the , and directions. MATLAB simulations of the operations indicated in each column performed on the 2D binary images used for the experiment are shown for comparison.
Correlator output in the direction, demonstrating image recognition: of a cross against some geometrical images and of an airplane for different orientations, demonstrating the expected sensitivity of the convolution operation to object rotations.
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