2. Advanced materials for photorefractive and electro-optical devices.

Accomplishments in this category include demonstration of efficient photosensitization and high optical gain in a quantum-dot sensitized hybrid photorefractive nanocomposite at the telecommunication wavelength of 1.34 μm; design of new organically-modified-silica precursor material systems for electro- optical devices; and demonstration of photoconductivity and photorefractivity at infrared wavelengths in hybrid nanocomposites.

3. Novel organic dyes for multiphoton-pumped frequency-up-conversion lasing.

Two-, three-, and four-photon-pumped stimulated emission (cavityless lasing) properties of ten stibazolium dyes in solution were studied comprehensively.

4. A new type of stimulated Rayleigh-Bragg scattering generated in a novel two-photonabsorbing- dye solution.

This scattering is, more specifically, a two-photon-excitation-enhanced backward stimulated Rayleigh scattering. This stimulated scattering shows no frequency shift, and therefore, is different from most other known stimulated scattering processes. The principle of this effect can be highly useful for optical phase conjugation and optical-power limiting.

This work was done by Paras N. Prasad and Guang S. He of the University of Buffalo for the Air Force Research Laboratory.

AFRL-0044

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