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Abstract.An experimental device to show in a single display all the di raction patterns generated by a 1D fractal structure is proposed. It is found that in addition to being the optimum display to see the evolution of the di racted eld through free space, some interesting features, such as continuous evaluation of self-similarity from the object to the far eld, can be obtained experimentally.

An experimental device to show in a single display all the di rac-tion patterns generated by a 1D fractal structure is proposed. It is found that in addition to being the optimum display to see the evolution of the di racted eld through free space, some interesting features, such as continuous evaluation of self-similarity from the object to the far eld, can be obtained experimentally.

The analysis of light propagation in a tapered gradient-index (GRIN) medium when the input signal is a binary function is considered with the Walsh-Hadamard analysis. The study of the evolution of the sequency spectrum through the GRIN medium by the Walsh-Hadamard transform confirms the self-imaging effect.

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