6 July 2001 Second-harmonic-generated hologram for information processing
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Abstract
A method of wavefronts' cross-correlation by means of Second Harmonic Generated Hologram (SHG hologram) is considered. According to this method, the interference pattern of an object and reference waves is recorded in a nonlinear light-sensitive material using its second order nonlinearity. The SHG hologram generates a wave that forms the reconstructed image of the object, the frequency of the reconstructed wave being doubled. An expression that describes the electrical field of the reconstructed wave is deduced. It is suggested to use the transforming properties of the SHG hologram for constructing the network of changeable interconnection lines which operates on the principle 'light is controlled by light'. The experiment has confirmed the ability of the SHG hologram of forming high quality images of arbitrary objects. The ways of overcoming the effect of doubling the frequency of the light after each act of a signal transformation are considered. The theory has shown that by using the effect of 'down-conversion' it is possible either to return the frequency of the signal to its initial value or to sustain the value of the frequency at the constant level.
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Yuri N. Denisyuk, Yuri N. Denisyuk, Alessandra Andreoni, Alessandra Andreoni, Maria Bondani, Maria Bondani, Marco A. C. Potenza, Marco A. C. Potenza, } "Second-harmonic-generated hologram for information processing", Proc. SPIE 4392, Optical Processing and Computing: A Tribute to Adolf Lohmann, (6 July 2001); doi: 10.1117/12.432797; https://doi.org/10.1117/12.432797
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