H
Hugo L. Fragnito
Researcher at State University of Campinas
Publications - 174
Citations - 3049
Hugo L. Fragnito is an academic researcher from State University of Campinas. The author has contributed to research in topics: Optical fiber & Optical amplifier. The author has an hindex of 24, co-authored 169 publications receiving 2943 citations. Previous affiliations of Hugo L. Fragnito include University of California, Berkeley & Bell Labs.
Papers
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Journal ArticleDOI
Femtosecond photon echoes from band-to-band transitions in GaAs.
P. C. Becker,Hugo L. Fragnito,C. H. Brito Cruz,Richard L. Fork,J. E. Cunningham,Jaymie Henry,C. V. Shank +6 more
TL;DR: The observed functional dependence of the dephasing rate on the carrier density has yielded previously unavailable information on Coulomb screening in a nonequilibrium carrier distribution.
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Stimulated Brillouin scattering from multi-GHz-guided acoustic phonons in nanostructured photonic crystal fibres
Paulo Dainese,Paulo Dainese,P. St. J. Russell,Nicolas Joly,Jonathan Knight,Gustavo S. Wiederhecker,Hugo L. Fragnito,Vincent Laude,Abdelkrim Khelif +8 more
TL;DR: In this paper, the authors explore stimulated Brillouin scattering in photonic crystal fibres with subwavelength-scale solid silica glass cores and show that the spontaneous BrillouIN signal develops a highly unusual multi-peaked spectrum with Stokes frequency shifts in the 10 GHz range.
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Evolution of the vibronic absorption spectrum in a molecule following impulsive excitation with a 6 fs optical pulse
TL;DR: In this article, a 6 fs optical pulse was used to impulsively excited the entire manifold of Franck-Condon-connected vibronic levels for the S 0 to S 1 transition in an organic dye in solution.
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Field enhancement within an optical fibre with a subwavelength air core
Gustavo S. Wiederhecker,Gustavo S. Wiederhecker,Cristiano M. B. Cordeiro,Cristiano M. B. Cordeiro,Francois Couny,Fetah Benabid,Stefan A. Maier,Jonathan Knight,Carlos Henrique de Brito Cruz,Hugo L. Fragnito +9 more
TL;DR: In this article, the authors demonstrate the concentration of optical energy within a subwavelength-scale air hole running down the length of a PCF core, which resembles a submicrometre-diameter tube with a bore diameter of 200nm or less.
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Femtosecond photon echoes from molecules in solution.
TL;DR: In this paper, two pulse photon echoes were observed in organic dye molecules in solution using 6-fs optical pulses, and the results show an initial rapid dephasing of the echo due to level multiplicity followed by quantum beaks.