Accession Number : ADA293195

Title :   Picosecond Phase Conjugation: New Applications, Devices, and Materials.

Descriptive Note : Final rept. 1 Oct 91-31 Dec 94,

Corporate Author : UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES

Personal Author(s) : Feinberg, Jack

PDF Url : ADA293195

Report Date : 31 DEC 1994

Pagination or Media Count : 65

Abstract : In this project we investigated four main areas: (1) Temporal shaping of picosecond laser pulses using beam coupling in a photorefractive crystal. We showed both theoretically and experimentally that one can add or subtract picosecond light pulses onto existing light pulses to create arbitrary temporal waveforms. (2) The physics of the photorefractive effect in barium titanate crystals. We showed that photovaltaic currents play an important role in the formation of photorefractive gratings in barium titanate. We also derived a theory to explain the curved beam paths observed in photorefractive phase conjugators. (3)Frequency doubling in infrared light in glass. We proved decisively that second harmonic generation in optically prepared glass is caused by a dc electric field imprisoned in the glass. We mapped the spatial profile of this dc field to a resolution of one micron. (4)Injecting diode laser arrays using phase conjugation. We demonstrated that injecting broad-area diode laser with light causes the laser array to emit a spatially and spectrally narrow output beam. We use a double phase conjugator to guide light from an injecting laser into the lasing regions of the laser array. jg

Descriptors :   *CRYSTALS, *LASER BEAMS, *LIGHT PULSES, *BARIUM TITANATES, COUPLING(INTERACTION), DIODES, FREQUENCY, OUTPUT, SPATIAL DISTRIBUTION, INJECTION, OPTICS, SECOND HARMONIC GENERATION, PATHS, ARRAYS, SEMICONDUCTOR LASERS, ELECTRIC FIELDS, SEMICONDUCTOR DIODES, GLASS, SPECTRA, CURVATURE, PROFILES, PHYSICS, INFRARED RADIATION, DIRECT CURRENT, NARROW BEAMS(RADIATION).

Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Lasers and Masers
      Laminates and Composite Materials
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE