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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.
Time-resolved mid-infrared pump-probe measurements in a quantum cascade laser operating above threshold reveal gain recovery dynamics to be two-fold: relaxation within a stage on a sub-picosecond scale and transport between stages on a picosecond scale.
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.
Time-resolved mid-infrared-pump, optical-probe differential transmission spectroscopy directly reveals electron dynamics in n-doped quantum dots infrared detector structure. Capturing and intradot relaxation time were measured. Nanosecond-scale dynamics in the n=1 state was also observed.
Ultrafast electron dynamics in quasi-one-dimensional NbSe3 conductors was investigated by means of two-color pump-probe reflectivity measurements. The results clearly demonstrate the resonant probing of the charge-density-wave phases with different transition properties.
The which-way information and interference visibility in a temporal version of double- and triple-slit experiments with attosecond electron wave packets generated by a soft X-ray pulse train can be controlled by a phase-stabilized laser pulse.
Sub-picosecond all-optical switching at telecommunication wavelengths has been demonstrated by utilizing an intersubband transition of II-VI-based MQW fabricated in high-mesa waveguide devices with separate confinement heterostructure, where (CdS/ZnSe)/BeMgTe QW is employed as active layer.
Optical-pump, terahertz-probe reflection spectroscopy was investigated for the study of femtosecond laser-induced ablation dynamics. The technique can directly measure the quasi-DC complex electrical conductivities of laser-heated solids using non-contact terahertz probe pulses.
The spin relaxation within the radiative doublet of the exciton ground state in InAs/GaAs quantum dots is studied via ultrafast spectral hole burning spectroscopy. A biexcitonic resonance emerges due to relaxation of the exciton spin.
We have demonstrated highly efficient phase conjugation of 1 mum pico-second Laguerre Gaussian modes for the first time. The angular momentum of phase conjugation was also investigated by an interferometric technique.
We use ultrafast THz spectroscopy to study coherent plasmon oscillations in InSb. The coherent plasmons can be manipulated by optical carrier injection and engineered structures that induce Landau damping.
We experimentally demonstrate a novel Kerr shutter functioned by the interaction of carbon nanotubes with the evanescent-field of propagating light in a D-shaped fiber. The scheme initiates applications of the nanotubes to ultrafast all-optical switches.
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