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Pump-probe reflectivity measurements have shown that the multiple shots of low-fluence femtosecond laser pulses on silicon accumulate non-thermal bonding structure change to decrease ablation threshold and subsequently excite surface plasmon polaritons for periodic nanoscale ablation.
Self-organized periodic nanostructures much smaller than the laser wavelength are often produced on solid surfaces in femtosecond (fs) laser ablation [1]. It is well known that the nanostructure formation is sensitive to the experimental conditions, and superimposed multiple shots of low-fluence fs laser pulses are especially effective for the nanostructuring. However, the role of multiple shots of...
In this paper we report the results of angle-dependent HHG from aligned molecules that have been observed at a low Trot of N2 and O2, which lead to a possible imaging of the characteristic molecular structure and dynamics.
High-order harmonic generation from field-free aligned molecules has been measured as a function of the angle between polarization directions of femtosecond pump and probe pulses. The results are compared with the recent theoretical prediction for N2, O2 and CO2 molecules.
This paper reports an experimental study to understand nanostructuring process in femtosecond laser ablation of diamond-like carbon film. We found that the structure starts to be formed on the submicrometer stripes patterned on the surface, demonstrating that the nanometer-scale ablation is induced with local fields generated on the surface.
This paper discusses rotational coherence created in wave packets of N2, O2 and CO2 with intense ultrashort laser pulses and observed with high-order harmonic generation. We identify the origin of several sets of frequency component included in the time-dependent harmonic signal and its effect on the revival structure.
We developed a multilevel spiral phase plate that generates a Laguerre-Gaussian beam by applying the wave surface of a spiral structure directly to a Gaussian beam for high intensity laser pulses
We have developed a unique polarization converter based on optical rotatory of liquid crystal to generate the radial polarization from the linear. Intense longitudinal electric field near the focus was experimentally observed for the first time by using a two-dimensional optical Kerr shutter camera.
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