Accession Number : ADP006781
Title : Picosecond Nonlinear Optical Responses in Photorefractive Crystals,
Corporate Author : OKLAHOMA STATE UNIV STILLWATER CENTER FOR LASER RESEARCH
Personal Author(s) : Liu, H. ; Reeves, R. J. ; Powell, R. C.
Report Date : 22 MAY 1992
Pagination or Media Count : 4
Abstract : Picosecond-pulse laser excitation was used to establish and probe refractive index gratings in KNbO3, KTaO3, and mixed crystals. The purpose of this work was first to identify the physical processes contributing to fast nonlinear optical responses in these samples and second to determine how these processes evolve with time into the space-charge field photorefractive effect observed with continuous wave excitation. The techniques of pulse-probe degenerate four-wave mixing and nondegenerate four-wave mixing with a continuous wave probe laser were both employed to obtain information about the photorefractive processes that take place after fast pulse excitation.
Descriptors : *REFRACTIVE INDEX, *NONLINEAR OPTICS, *LIGHT PULSES, CONTINUOUS WAVES, CRYSTALS, EXCITATION, INDEXES, LASERS, MIXING, PROBES, PULSES, RESPONSE, SPACE CHARGE, POTASSIUM COMPOUNDS, GRATINGS(SPECTRA), REFRACTION, BEAMS(RADIATION), TANTALUM, SYMPOSIA, NIOBIUM.
Subject Categories : Optics
Distribution Statement : APPROVED FOR PUBLIC RELEASE