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Conference on Lasers and Electro-Optics

Terahertz bit-rate optical processing by femtosecond two-pulse photon echo

Olavi Ollikainen, Jürgen Gallus, Cecilia Nilsson, Daniel Erni, Alexander Rebane

Published Jan 1, 1998• 0 citations
Publisher

Abstract

Summary form only given. We apply low-temperature polymer film doped with a near IR-absorbing naphthalocyanine-type dye molecules with 10 THz-broad inhomogeneous absorption band to demonstrate multiplication of two 8-bit binary vectors in less than 10 ps by two-pulse photon echo.
DOI
10.1109/cleo.1998.676151

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•Jan 1, 1999•0 citations
The possibility to mechanize at room temperature a logical function of bit-to-bit parallel multiplication for optical echo-processor based on the third-order nonlinear optical response of a resonant medium is experimentally studied. The polyvinilbutural film doped with phthalocyanine dye was used as an operating medium in our experiments. The time needed to realize the logical operation, the result of which is presented in the spectrum of the nonlinear optical response of the medium after action of the two spectrally coded pumping pulses, is less than 1 ps. The values of a homogeneous broadening of S 0 – S 1 line Γ hom = 89 cm -1 and Γ hom = 44 cm -1 are established at T = 300 K and T = 77 K respectively. The laser excitation parameters needed for effective operating of optical processor are defined. The maximum word length achievable under current experimental conditions is estimated.
The signals of primary and stimulated femtosecond photon echo in polymer films doped with dye (phthalocyanine) molecules have been experimentally investigated at room temperature. A femtosecond echo spectrometer for these echo experiments is described. The decay curves of echo signals with increasing time intervals between excitation femtosecond pulses are obtained and blue shifts of the spectra of femtosecond echo signals with respect to the spectrum of excitation pulses are revealed. The possibilities of using the studied doped polymer films as recording media for high-temperature echo processors and coolants in optical refrigerators are analyzed.