Accession Number : ADA260592
Title : Second-Harmonic Generation in Optical Fibers and Glass.
Descriptive Note : Final rept. Aug 89-Aug 92,
Corporate Author : UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
Personal Author(s) : Dominic, Vincent G
Report Date : 30 Sep 1992
Pagination or Media Count : 35
Abstract : This is the final report for the JSEP fellowship awarded to Vincent G. Dominic. We report on our investigation into the unusual and unexpected effect of second-harmonic generation in optical fibers and optical fiber preforms. We make three important conclusions: Experimental investigations into this effect are simpler and more controllable if carried out in bulk glass samples (optical fiber preforms) rather than in the optical fibers themselves. The induced second-order nonlinearity arises from a DC electric field which is induced inside the glass by light beams containing a fundamental frequency (omega) and its second harmonic (2 omega). The light beams induce the DC electric field through a multiple-photon process. Specifically, we believe that the interference between several multi-photon ionization channels gives rise to anisotropic emission of photoelectrons. The ejected electrons create a photogalvanic current that builds the DC electric field.... Second - harmonic, Generation, Nonlinear optics, Optical fibers.
Descriptors : *OPTICS , *FIBERS , *GLASS , *SECOND HARMONIC GENERATION , FREQUENCY , BULK MATERIALS , ANISOTROPY , IONIZATION , EJECTION , PHOTOELECTRONS , CHANNELS , DIRECT CURRENT , PHOTONS , INTERFERENCE , ELECTRONS , NONLINEAR OPTICS , EMISSION , LIGHT , ELECTRIC FIELDS
Subject Categories : Refractory Fibers
Electricity and Magnetism
Distribution Statement : APPROVED FOR PUBLIC RELEASE