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Stimulated THz emission from intra-excitonic 3p to 2s transitions in Cu2O is directly observed by ultrafast opto-electronics. The process occurs at a photon energy of 6.6 meV, with a cross section of ~10-14 cm2.
We have measured an optical Stark effect in semiconducting single-walled carbon nanotubes. Upon application of a non-resonant pump beam, we observe an instantaneous blue shift in the optical resonances that scales linearly with pump intensity.
We observed nutation in the time-resolved photoluminescence signals from resonantly coupled ZnO double-quantum-well structures via optical near-field energy transfer, in which the period of the nutation was determined to be 550 ps.
We report the observation of coherent phonon oscillations of radial breathing modes in insolated single-wall carbon nanotubes in suspension. Resonantly-excited radial breathing modes are analyzed to give us a new tool for chirality assignments, complimentary to photoluminescence and CW Raman spectroscopies.
We show theoretically how electrical and pure spin AC currents can be optically injected in semiconductors via excitation of continuum carriers. The electrical current should be observable by detecting its THz radiation.
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.
Localized and propagating surface plasmon dynamics in Ag films are imaged by time-resolved photoemission electron microscopy with <10 fs time and d~40 nm spatial resolution. Movies of plasmon dephasing are recorded with 330 as/frame rate.
This paper deals with the microstructure of the generated crystals in borate glass by femtosecond laser irradiation, Raman spectroscopy was used to study the distribution of the two phases of barium metaborate crystals produced.
We present a contrast filter reaching 12 orders of magnitude from micro to milliJoule input pulse with 24% efficiency. It solves contrast issue for Petawatt class lasers in microjoule seeded CPA or double CPA scheme.
We have generated squeezed vacuum in optical telecommunication band by a single-pass parametric amplification in periodically poled lithium niobate. The measured noise reduction was 3.1 dB below the shot-noise level.
We investigate the fabrication of dielectric components for surface plasmon polariton (SPP) processing by two-photon polymerization of photosensitive materials on metal surfaces. SPP guiding and focussing will be demonstrated using near- and far-field optical microscopy.
We have investigated the behavior of dissociative ionization of ethanol molecules under irradiation of 400 nm and 800 nm femtosecond laser pulses. When changing the time delay and intensity ratio between these two pulses, fragmentation significantly changes.
Results on the inscription of Type IIA Bragg gratings in B-germanosilicate fibres using 248 nm, 500 fs laser radiation are presented. The gratings recorded exhibit index changes Deltan ap 10-3, while they remain intact for temperatures up to 650degC.
The conditions for high fidelity parametric transfer of the pulse shape of a near-infrared pump pulse to a mid-infrared idler pulse of a synchronously pumped optical parametric oscillator are investigated theoretically and experimentally.
A channel waveguide exhibiting internal gain under pumping is fabricated inside erbium doped oxyfluoride-silicate glass using a femtosecond laser. The waveguide cross section and refractive index contrast is controlled using a multi-scan technique.
Independent, absolute measurements of the pump, signal and idler carrier-envelope phase slip frequencies in a Ti:sapphire-pumped femtosecond optical parametric oscillator are demonstrated by characterisation against a common super-continuum reference derived from a photonic crystal fibre.
The magnetic field orientation dependence of the terahertz radiation intensity from GaAs/AlGaAs modulation-doped structures with varying spacer thickness was investigated. Results are analyzed in the context of junction electric field, carrier mobility, and interface roughness.
Tunable few-cycle laser pulses in the visible spectrum are efficiently generated by four wave mixing process during the filamentation in air. The mode quality and energy stability were exceptional.
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