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