Accession Number : ADA308961
Title : AASERT: Optical Characterization of Diamond Films for Superconducting.
Descriptive Note : Final rept. 1 Aug 92-31 Jul 95,
Corporate Author : ARKANSAS UNIV FAYETTEVILLE BOARD OF TRUSTEES
Personal Author(s) : Xiao, Min
PDF Url : ADA308961
Report Date : 24 MAY 1996
Pagination or Media Count : 13
Abstract : We have discovered and have characterized a new nonlinear optical effect. The effect is studied in a strontium barium niobate substrate material but should be observable in diamond photorefractive substrates as well. We show that a quasi-steady-state photorefractive spatial soliton forms a waveguide structure in the bulk of a photorefractive material. Although the optically induced waveguide is formed by a very low power (microwatts) soliton beam, it can guide a powerful (watt) beam of a longer wavelength at which the medium is nonphotosensitive. Furthermore, the waveguide survives, either in the dark or when guiding the longer wavelength beam, for a long time after the soliton beam is turned off. We take advantage of the solitons' property of evolution from a relatively broad input beam into a narrow channel and show that the soliton induces a tapered waveguide (an optical funnel) that improves the coupling efficiency of light into the waveguiding structure.
Descriptors : *OPTICAL WAVEGUIDES, *PHOTOREFRACTIVE MATERIALS, COUPLING(INTERACTION), LOW POWER, FILMS, EFFICIENCY, DIAMONDS, TAPER, HIGH TEMPERATURE SUPERCONDUCTORS, SOLITONS.
Subject Categories : Optics
Electrooptical and Optoelectronic Devices
Distribution Statement : APPROVED FOR PUBLIC RELEASE