title: Wavelength-tunable ultrashort-pulse output of a photonic-crystal fiber designed to resolve ultrafast molecular dynamics.
abstract: Wavelength-tunable 100 fs pulses generated through the soliton self-frequency shift in a photonic-crystal fiber are employed to visualize femtosecond coherence and population relaxation dynamics in molecular aggregates by means of time-resolved sum-frequency generation. This technique reveals an ultrafast dephasing of coherent molecular excitations with a phase relaxation time of about 120 fs and resolves an ultrafast switching of the nonlinear-optical response of molecular aggregates.
authors.affiliation: Center of Photochemistry, Russian Academy of Sciences, Moscow, Russia.
authors.forename: Anatoly A
authors.initials: AA
authors.lastname: Ivanov
authors.forename: Mikhail V
authors.initials: MV
authors.lastname: Alfimov
authors.forename: Aleksei M
authors.initials: AM
authors.lastname: Zheltikov