Journal ArticleDOI
Sub-20-fs pulses tunable across the visible from a blue-pumped single-pass noncollinear parametric converter.
TLDR
Femtosecond pulses with center wavelengths between 470 and 750 nm are generated in a single-stage type I BBO optical parametric amplifier pumped by a frequency-doubled 1-kHz Ti:sapphire amplifier.Abstract:
Femtosecond pulses with center wavelengths between 470 and 750 nm are generated in a single-stage type I BBO optical parametric amplifier pumped by a frequency-doubled 1-kHz Ti:sapphire amplifier. A high-quality white-light continuum is used as the seed. Pulse durations as short as 16 fs and pulse energies of as much as 11 microJ are observed. The quantum efficiency is ~25% for both 7- and 40-microJ pump pulses. This unique combination of ultrashort pulse duration and high conversion is made possible by noncollinear phase matching that permits a sufficiently large amplification bandwidth. Simultaneously the group velocities of the signal and the idler are effectively matched. As a result widely tunable sub-20-fs pulses can be generated in a nonlinear crystal as thick as 2 mm.read more
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Proceedings Article
Attosecond Physics
TL;DR: In this paper, an attosecond "oscilloscope" was used to visualize the oscillating electric field of visible light with an oscillator and probe multi-electron dynamics in atoms, molecules and solids.
Journal ArticleDOI
Ultrafast optical parametric amplifiers
TL;DR: In this paper, the authors summarized the recent progress in the development of ultrafast optical parametric amplifiers, giving the basic design principles for different frequency ranges and in addition presenting some advanced designs for the generation of ultrabroadband, few-optical-cycle pulses.
Journal ArticleDOI
Conical intersection dynamics of the primary photoisomerization event in vision
Dario Polli,Piero Altoè,Oliver Weingart,Katelyn M. Spillane,Cristian Manzoni,Daniele Brida,Gaia Tomasello,G. Orlandi,Philipp Kukura,Richard A. Mathies,Marco Garavelli,Giulio Cerullo +11 more
TL;DR: Ultrafast optical spectroscopy with sub-20-fs time resolution and spectral coverage from the visible to the near-infrared allows us to follow the dynamics leading to the conical intersection in rhodopsin isomerization and finds excellent agreement between the experimental observations and molecular dynamics calculations that involve a true electronic state crossing.
Journal ArticleDOI
Quantum control of energy flow in light harvesting.
Jennifer L. Herek,Jennifer L. Herek,Wendel Wohlleben,Richard J. Cogdell,Dirk Zeidler,Marcus Motzkus +5 more
TL;DR: In this article, a feedback-optimized coherent control over the energy-flow pathways in the light-harvesting antenna complex LH2 from Rhodopseudomonas acidophila, a photosynthetic purple bacterium, is presented.
Journal ArticleDOI
Femtosecond time-resolved photoelectron spectroscopy.
TL;DR: Femtosecond time-resolved or wave packet methods offer a view complementary to the usual spectroscopic approach and often yield a physically intuitive picture in discerning underlying dynamics.