Transient-grating frequency-resolved optical gating

Sweetser, John N.; Fittinghoff, D. N.; Trebino, Rick

doi:10.1364/ol.22.000519

Cited by 124 publications

(64 citation statements)

References 5 publications

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“…The pulses were nearly chirp-free, as established by transientgrating frequency resolved optical gating measurements (TG-FROG) in the self-diffraction configuration. 62 A TG-FROG trace for the pulses centered at 12650 cm -1 is shown in Figure 2.…”

Section: Methodsmentioning

confidence: 99%

Exciton Delocalization and Initial Dephasing Dynamics of Purple Bacterial LH2

et al. 2000

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Ultrafast four-wave mixing spectroscopies are employed to study exciton dynamics associated with the B800 and B850 transitions of LH2 from Rhodobacter sphaeroides. Bacteriochlorophyll a , the constituent chromophore of the B800 and B850 aggregates, is studied as a monomer in solution for comparison. Frequency-resolved pump-probe spectra measured across the B800 and B850 bands establish that at zero delay the transition dipole moment of B850 is substantially larger than that of B800, indicating an initial coherence size of ∼13 chromophores in the (18-member) B850 aggregate. Novel frequency-resolved stimulated photon echo measurements show that intermolecular interactions in the B850 ring reduce the coupling of this band's electronic transition to nuclear motion. In contrast, linear electron-nuclear coupling is comparable in the bacteriochlorophyll a monomer and B800, where exciton coupling is weak. Photon echo peak shift data are consistent with these observations. The initial localization dynamics of the B850 exciton are resolved with transient grating and pump-probe magic angle measurements. These data show that the enhanced transition dipole moment of B850 at the moment of excitation contracts significantly with a time constant of ∼50 fs (for transient grating) due to exciton dephasing resulting in localization. Pump-probe anisotropy measurements reveal substantial transition dipole moment orientational relaxation with nearly the same time constant. These experimental data will be useful for the development of a rigorous theoretical picture of ultrafast exciton dynamics in LH2. B850's large transition dipole moment for absorption may play an important role in the biological function of LH2, as it would enhance the energy transfer rate between B800 and B850.

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Section: Methodsmentioning

confidence: 99%

Exciton Delocalization and Initial Dephasing Dynamics of Purple Bacterial LH2

et al. 2000

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“…The third FROG type which we set up to characterize our light pulses is a transientgrating FROG (TG-FROG) [119]. In contrast to the FROG types presented before, it exploits the third-order nonlinearity of a medium for the gating process.…”

Section: Transient-grating Frogmentioning

confidence: 99%

Generation and Parametric Amplification of Few‐Cycle Light Pulses at Relativistic Intensities

Kessel

2018

Springer Theses

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“…15 Following compensation for positive group velocity dispersion (GVD), which originates from the amplified CD-TS system and several beam-splitters and waveplates, the pulse train is split into three beams of approximately equal intensity for measurements such as photon echo or transient grating. The three beams, with momentum vectors k 1 , k 2 , and k 3 are sent through variable delay lines and focussed into the sample using an all-reflective Cassegrain telescope (M1 = 40 cm, M2 = -100 cm) to a spot of less than 200 microns diameter at a crossing angle of less than two degrees.…”

Section: Pulse Characterizationmentioning

confidence: 99%

“…15 In this case, three excitation beams in a boxcars geometry were allowed to interact in the non-linear medium of fused silica. The pulses generated by the CD-TS laser described here have substantially less energy than the pulses used by Trebino and co-workers, and so the signal level benefits from having a medium with larger non-linearity to generate an easily measurable TG-FROG type signal.…”

Section: Pulse Characterizationmentioning

confidence: 99%

<title>Novel laser system for ultrafast spectroscopy</title>

1998

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The design and performance of a cavity-dumped Ti:sapphire (CD-TS) oscillator and short pulse-pumped amplifier system is presented. Dumped pulses as short as 12 fs duration and 60 nJ in energy, with 70%-80% dumping efficiency are made possible by a stretched dumper-arm configuration. The oscillator yields stable, reliable, and reproducible pulses. Pulse duration and phase structure are analyzed via wavelength-resolved nonresonant (solvent) scattering (WRNS). Single and multi-pass amplification schemes and performance results are described. The optical continuum generated using single-pass amplified pulses is characterized by frequency-resolved cross-correlations.

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Transient-grating frequency-resolved optical gating

Cited by 124 publications

References 5 publications

Exciton Delocalization and Initial Dephasing Dynamics of Purple Bacterial LH2

Exciton Delocalization and Initial Dephasing Dynamics of Purple Bacterial LH2

Generation and Parametric Amplification of Few‐Cycle Light Pulses at Relativistic Intensities

<title>Novel laser system for ultrafast spectroscopy</title>

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