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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.
Sub-10-fs visible pulses allow real time detection of coherent phonons in single-walled carbon nanotubes. Nonlinear coupling between radial breathing (250 cm-1) and the carbon-stretching (1600 cm-1) modes is experimentally observed and theoretically modeled.
We demonstrate a muW-level broadly tunable THz source based on parametric down-conversion in orientation-patterned GaAs pumped by femtosecond pulses from a Tm-doped fiber laser. Generated THz powers should be scalable to mW-levels with this approach.
Spectral phase correction (TBP<1.005) of femtosecond regeneratively amplified pulses using a MIIPS-enabled pulse shaper positioned between the oscillator and amplifier is performed. Rigorous characterization of the shaped output pulses will be presented.
Using non-linear coupled-mode equations and a Bloch-wave approach, we show that the nonlinear propagation of femtosecond pulses and supercontinuum light inside fiber grating can be modeled by nonlinear Schrodinger equation with modified dispersion profile.
We describe measurements of the spectrogram of femtosecond pulses, propagating between 5-700 mm in distilled water. The observed pulse breakup is qualitatively related to points of stationary phase and related to possible precursor activity.
We study adiabatic soliton compression of femtosecond pulses in second harmonic generation by using chirped quasi-phase-matching gratings in the absence of group velocity mismatching. Two GV-matching schemes on collinear and non-collinear QPM are numerically investigated.
Reflective micro-optical components for shaping non-diffracting beam arrays were fabricated by proportional transfer of continuous resist profiles into silica and silicon via e-beam writing and gray-tone lithography. Low dispersion multiplexing of 10-fs pulses was demonstrated.
We report new nonlinear features observed in an adiabatically tapered photonic crystal fiber. When using femtosecond pulses, the soliton self-frequency shift and generation of nonsolitonic radiation result in a dasiashark-finpsila-shaped feature in the power-dependent spectrum.
A flexible image guide is excited by femtoseconde pulses. Precompensation of dispersion and nonlinear effects encountered in the waveguide allows the recording of two photon fluorescence endoscopic images of colon cells.
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