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We experimentally demonstrate group velocity control of 40-fs, 1400-nm pulses through chi(2)-cascaded interactions under large group velocity mismatch. Group delay shifts up to 50 fs are achieved by propagation in a 25-mm-long PPSLT crystal.
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.
Coherent control of two-photon induced birefringence in azoaromatic polymers was achieved by shaping the phase of the spectral components of ultrashort pulses. The signal dependence on chirp and phase mask were studied and modeled.
The noncentrosymmetric molecular structures responsible for the second order nonlinear effects of collagen fibrils are identified by sum frequency vibrational spectroscopy. CH2 and C=O functional groups dominate the achiral and chiral spectra, respectively.
Tomography of high harmonic generation in a cluster jet was achieved by using laser machining. The growth curves help explain the optimal backing pressure, which is ascribed to the change in phase matching condition.
We observed the interference spectrum that depends on the carrier-envelope phase using a few-cycle laser pulse. The phenomenon is based on the interference between the second and third harmonics generated from a ZnO thin film.
Dramatic enhancement of second and third harmonic generation near the photonic band edge was observed simultaneously in a one-dimensional ZnS/YF3 photonic crystal structure. The theoretical simulations are in good agreement with the experimental results.
We investigated third harmonic generation and triple photon generation properties of TiO2 rutile single crystal, including phase-matching and figure of merit. We demonstrated that TiO2 is more efficient than KTiOPO4.
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.
A nonlinear index guiding silica PCF is optimized for efficient second harmonic generation through dispersion calculations zero group velocity mismatch is possible for any pump wavelength above 80 nm. Very high conversion efficiencies and bandwidths are found.
A planar-waveguide quasi-phase matched second-harmonic generation device, which consists of a Y-cut periodically poled MgO-doped LiNbO3 core and SiO2 claddings, provides 1-W green light with 30-% conversion efficiency at room temperature.
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.
We demonstrate a 120-mW hand-held ultraviolet laser at 0.355 mum by attaching a monolithic wavelength converter at the output end of an optical fiber which is delivering a near-infrared laser light at 1.064 mum.
Ex vivo and in vivo oral cancer diagnoses are demonstrated using noninvasive third-harmonic-generation biopsy. Through its superior spatial resolution on nucleus, oral cancer cells in hamster oral cavities are successfully identified without any exogenous markers.
A novel approach is used to enhance by nearly two orders of magnitude the conversion efficiency of a 125 nm-coherent source, based on four-wave mixing in room-temperature mercury vapor. Saturation issues are observed and discussed.
We demonstrate a quasi-phase matched Type II parametric down converter with adhered ridge waveguide for quantum information technology. The SHG normalized conversion efficiency was 250 %/W at 1.53848 mum for QPM period of 8.0 mum.
We realized, for the first time, NOLM-type all optical switching with carbon nanotubes loaded planar waveguide. ~20% splitting ratio contrast has been achieved using just 1 cm-long carbon nanotubes loaded planar waveguide.
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.
We determine the relative phase between bulk and surface contributions to second-harmonic generation (SHG) from Si(001) by exploiting the difference between right- and left-handed q-polarization, and by frequency-domain interferometric SHG.
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