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Femtosecond pulses coupled to hollow-pyramid near-field probes allow achieving sufficient peak power to perform near-field nonlinear optics. We present second-harmonic generation images of nanostructured metal surfaces with spatial resolution better than 100 nm.
As one of the first observations of intra-molecular dynamics using high-order harmonic generation, we impulsively excite vibrations in SF6 and observe oscillations in the intensity of high-order harmonic emission from these molecules.
Two-dimensional multicolored arrays of quadratic spatial solitons and up-converted parametric amplifications are observed through cascaded non-collinear quadratic processes in quadratic media, which can be switched by phase-insensitive weak beam control with second harmonic seeding pulses.
Two experimental geometries are introduced to selectively image transverse and longitudinal components of the optical near-field in plasmonic nanostructures. Our experimental results are in excellent agreement with theoretical predictions.
High-order stimulated Raman scattering was used to generate coherent radiation from 1.49 mum to 330 nm. A probe pulse injected after the pump scattered into 15 intense sidebands with a FWHM from 476 nm to 350 nm.
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