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The application of femtosecond transition-state spectroscopy (FTS) to molecular iodine is reported. The real-time motion of wave packets prepared coherently in the bound B state is observed. In addition, the motion is probed near and above the dissociation limit for the reaction: I 2 →I ( 2 P 3/2 )+I ∗ ( 2 P 1/2 ). FTS measurements of the dynamics on...
Coherent anti-Stokes Raman scattering (CARS) typically involves the interaction of the material with three (pump, Stokes, and probe) laser beams. Recently developed by the Silberberg group [1], single-beam CARS takes all pump-Stokes-probe fields from one ultra-broad bandwidth laser source and removes the complexities involved when using several laser pulses and has become increasingly popular in biomedical...
Self phase modulation in hollow waveguide filled with noble gases have been successfully used to produce ultra-broad bandwidths. The intense spectral phase distortions produced by self phase modulation have previously been compensated by prism pairs and adaptive pulse shaping. Here we demonstrate the generation of 4.8 fs, 200 muJ intense laser pulses by multiphoton intrapulse interference phase scan...
We characterize the behavior of optical pulse propagation in surfaces covered with silver metal nanoparticles and quantify the dispersion introduced as the pulse propagates.
Spectral phase comb shaping is shown to be a powerful concept for phase-only generation and in-situ characterization of arbitrary optical pulse sequences, where the temporal shape of every pulse in the train is controlled independently.
Transform limited ultrashort pulses are used in a laser-scanning two-photon microscope for imaging of various biological specimens, demonstrating the importance of dispersion-free imaging system. Pulse characterization, qualitative and quantitative data are presented.
We report design parameters to eliminate or minimize the spatial distortion for shaped femtosecond pulses after a Fourier-transform pulse shaper, theoretically and experimentally. We conclude that all distortions are avoided with correct pulse shaper setup.
We introduce an improved method for standoff chemical detection of films and residues on solid targets which scatter or reflect the incident light using single-beam Coherent anti-Stokes Raman Scattering.
Ultrashort shaped pulses are becoming available and their use for biomedical imaging will permit signal enhancements, allow selective excitation, and reduced photobleaching. These pulses are also enabling new imaging modalities which provide greater chemical information.
The ability of multiphoton intrapulse interference to direct the fragmentation pathway of protonated gas phase fluorescein ions is explored and monitored via ion trap mass spectrometry.
Binary phase shaping is applied to single-beam CARS spectroscopy of gas mixtures, such as ambient air, and is shown to provide mode-selectivity and enhanced non-resonant background suppression capability when compared with the original technique.
We present a novel imaging mass spectrometry technique using femtosecond laser pulses to ionize the sample at atmospheric pressure and without the need of a laser-absorbing matrix. A 10 mum-resolution image of biological tissue is demonstrated.
We report a method for generation of ultra-broad bandwidth laser spectrum using self-phase modulation in the argon-filled hollow waveguide and pulse compression with multiphoton intrapulse interference phase scan technique.
We present a direct measurement method of the spectral phase of ultrafast laser pulses. The second-derivative of the unknown spectral phase can be directly envisioned and extracted from the experimental 2D-contour plot without mathematical manipulation.
We report a new method for standoff chemical detection based on single ultrafast pulse excitation for remote coherent anti-Stokes Raman spectroscopy. Mode-selective and background-free excitations were achieved through optimal binary phase pulse shaping.
We demonstrate the use of spectral phase modulation as a mechanism for control over surface-plasmon-mediated two-photon-induced luminescence at distances tens of microns from the focal spot of a femtosecond laser.
We introduce a method for remote chemical detection that utilizes Single Ultrafast Pulse Excitation for remote coherent anti-Stokes Raman spectroscopy (SUPER-CARS).
Breakthrough technology in remote femtosecond pulse characterization and accurate delivery of ultrashort shaped pulses to distances greater than 30 meters is being used to develop remote detection of explosives as well as biological warfare agents.
Shaped dispersion-compensated ultrashort laser pulses are used to produce selective excitation for biological imaging. Matrix diagonalization is used to optimize contrast making it possible to image subcellular components.
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