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Coherent dynamics of vibrational modes in gold nanoshells is studied by means of ultrafast pump-probe spectroscopy. A theoretical model is developed that provides a good agreement with experimental data.
Long-range periodic nanoplane gratings written inside fused silica using a focused femtosecond laser beam can be erased and replaced with new gratings whose orientation is determined by the polarization of the femtosecond laser overwrite beam.
We present a novel setup for characterizing DUV femtosecond pulses and investigating ultrafast phenomena. This allows us to directly utilize femtosecond pulses for spectroscopic applications without changing an optical alignment.
One-step femtosecond laser writing is used to make nanoporous capillaries inside fused silica. Laser-induced dye fluorescence shows penetration over millimeters. Fluid flow can be controlled through the porosity dependence on the laser writing parameters.
We describe a high repetition rate laser driven X-ray source and the optimization of the X-ray generation at low energy level. This source was used in time resolved X-ray diffraction to study the coherent acoustic phonon.
We have successfully determined the anharmonic decay time of coherent longitudinal-acoustic-phonons in GaN. The temperature dependent anharmonic decay behavior is found to agree well with the Herringpsilas theory even up to the sub-THz frequency regime.
The height, position, and even spacing of peaks in stepwise and direct multiphoton ionization spectra can be coherently controlled through the time delay or relative phase of two ultrashort laser pulses.
We present a quantitative analysis of self-arranged sub-wavelength structures created by femtosecond laser micromachining in silica. From the spatial correlation we calculate the periods of the structures versus laser energy and wavelength, and translation speed.
The role of polarons in the quantum kinetics of carrier-phonon interaction is emphasized. Scattering processes involving polarons allow ultrafast relaxation even if the phonon energy is not resonant with the electronic transitions.
It is observed that writing by femtosecond laser from left to right can be different from writing in the opposite direction. Structures with broken mirror symmetry in chalcogenide glass are discovered. Chiral patterns are demonstrated.
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