PARAMETRIC IMAGE CONVERSION .I.

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. © 1969 The American Institute of Physics.