Possible up-conversion of an image with the aid of stimulated parametric scattering in isotropic media

An image of an object (circular aperture), illuminated with radiation of λ = 1060 nm wavelength, was converted to the λ = 700–400 nm range. The conversion was performed in a sample of the K-8 optical glass pumped with picosecond pulses produced by a neodymium-glass laser. The object was placed at the focus of a lens where a Fourier transform of the object was located, and the converted image was reconstructed using radiation scattered from a large number of self-focusing filaments. The reconstruction was possible because of retention of spatial coherence in the scattered radiation.