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Optics Letters

Polarization-based optical logic using laser-excited gratings

G. Ravindra Kumar, Bhanu Pratap Singh, K. Divakar Rao, K. K. Sharma

Published Feb 15, 1990• 16 citations
Publisher

Abstract

We present a novel way of performing optical logic. The proposed logic device is based on the polarization switching observed in the first-order diffraction from a laser-excited grating in a dye-doped solid.
DOI
10.1364/ol.15.000245

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Experimental and theoretical (using a two-level approximation) investigations were made of the properties of resonance holograms (excited-state gratings) created by monochromatic linearly polarized radiation from a cw dye laser in a beam of sodium atoms as a result of the 32P3/2– 32S1/2(F=2) transition. A good qualitative agreement was observed between the theory and experimental results. It was established that the maximum diffraction efficiency was attained when the intensity of the radiation used to form the hologram was of the order of the intensity needed to saturate the transition and the optical thickness of the beam was ~1.1. The sensitivity of the medium was ~1 nJ/cm2 for 1% diffraction efficiency.
Four-wave mixing spectroscopy is presented as a convenient and effective optical method for the study of excited-state optical storage properties and nonlinear mechanisms in a dye-doped polymer film. The dynamic processes of optical storage properties and the efficiency of the diffraction grating are discussed. Backward-scattering four-wave mixing and forward-scattering four-wave mixing optical configurations are presented. A simple energy-level model is used to explain the excited-state optical storage mechanism, resulting from photo-induced excited-state population grating and trans-cis isomer grating.