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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Signal expressions and initial design for a 3D ORAM radiation dosimeter reader

Joel Mobley, James S. Bogard, Marko Moscovitch, Tuan Vo-Dinh

Published Feb 10, 1999• 4 citations
Publisher

Abstract

Three-dimensional optical memories which utilize two-photon processes have been proposed for use as a radiation dosimeter. The 'bits' stored by the optical memory are altered by the passage of radiation and can yield information about the dose and energy. In this work, the 'write' process of a two-photon optical memory is examined. This process uses a crossed-beam excitation scheme. By considering the spatial and temporal properties of the excitation sources used to drive the two- photon transitions, conditions are derived under which the number of absorption events due to the crossed-beams acting together outnumber the background events.

DOI
10.1117/12.339034

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Three-dimensional optical memories which utilize two-photon processes have been proposed for use as a radiation dosimeter. The 'bits' stored by the optical memory are altered by the passage of radiation and can yield information about the dose and energy. In this work, the 'write' process of a two-photon optical memory is examined. This process uses a crossed-beam excitation scheme. By considering the spatial and temporal properties of the excitation sources used to drive the two- photon transitions, conditions are derived under which the number of absorption events due to the crossed-beams acting together outnumber the background events.
Two-photon absorption 3-D optical memories have the potential for simple media fabrication, parallel access for high data transfer rates, high volumetric storage density, and low raw bit error rates (BER).1-2 The writing or erasure takes place at the intersection of two orthogonally propagating beams where a unique physical location is allocated to each stored bit. The data can be stored and retrieved in several formats in a single operation. By using either orthogonal-propagating beams or counter-propagating beams, it is possible to control the region of overlap of the two beams to be a single point, a line, or a plane. We will refer to those data formats as bit, vector, and image (or page) storage.
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A new variant of realization of quantum memory based on the use of a photon echo in an optically dense three-level gaseous medium is proposed. The use of a long-lived highly excited optical level as a storage of quantum information is the characteristic feature of the scheme proposed. This scheme of quantum memory is distinguished by reduced optical noises owing to the possibility of realizing temporal, spectral, and spatial selection of weak quantum radiation relative to the accompanying laser pulsed fields.