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Showing papers on "Parametric Image published in 1969"


Journal ArticleDOI
TL;DR: In this article, the authors considered frequency doubling image conversion of a brilliant object by self-interaction of its radiation within a nonlinear material and developed a theory of this type of image conversion which uses the formalism of Fourier optics.
Abstract: We consider frequency‐doubling image conversion of a brilliant object by self‐interaction of its radiation within a nonlinear material. We have demonstrated that by placing the nonlinear material in the image plane of a lens, high‐resolution, three‐dimensional image conversion can be achieved, whereas for other positions of the nonlinear material crosstalk noise can be so severe as to make the resultant image unrecognizable. We have developed a theory of this type of image conversion which uses the formalism of Fourier optics. This theory is applied to a case which is very similar to more general image converters and this case is experimentally demonstrated.

20 citations


Journal ArticleDOI
TL;DR: In this article, it was shown that image upconversion using optically nonlinear materials is equivalent to a conventional hologram constructed at the signal wavelength and readout at the upconverted wavelength.
Abstract: It is shown that image upconversion using optically nonlinear materials is equivalent to a conventional hologram constructed at the signal wavelength and readout at the upconverted wavelength. As such, it should be a truly three‐dimensional, high‐resolution process. For the particular case of equal signal and pump wavelengths, the upconverted image will have only half the angular extent of the original object wave. The image's transverse dimensions remain unchanged while its location relative to the frequency doubler and its longitudinal dimensions double in size. It is also shown how the phase matching condition follows from the vector condition for the reconstruction of a thick hologram.

15 citations


Journal ArticleDOI
01 Aug 1969
TL;DR: In this paper, it was shown that the image upconverter can operate with point source pump-beams as well as the commonly used planar pump source, and that the major effect of the pump beam divergence is not to degrade the resolution but is to change the transverse and longitudinal magnification of the image.
Abstract: It is shown that the image upconverter can operate with point source pump-beams as well as the commonly used planar pump source. The major effect of the pump beam divergence is not to degrade the resolution but is to change the transverse and longitudinal magnification of the image. We demonstrate by a paraxial ray-tracing analysis that these changes in image dimensions and location obey relations quite similar to thin-lens formulae.

4 citations