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We demonstrate second harmonic generation from a single GaAs nanoneedle with a wurtzite crystal structure. The optical anisotropy of the polar crystal results in strong nonlinear optical conversion compared to normal zincblende GaAs.
By repeated optical breakdown with focused femtosecond pulses, we decrease the refractive index of fused silica by few percent. The subsequent micro-lens formation is associated with a reduction of multiphoton absorption in all dielectrics.
We report an experimental study of pulsed Raman gain in As2Se3 chalcogenide fiber, for pump pulses between 1470 nm and 1560 nm, achieving the highest Raman gain at the longest pump wavelength, where two-photon absorption is lowest.
We developed a new approach to fabricate high-quality single-crystalline high-index-contrast waveguiding micro- and nanostructures and demonstrated electro-optic modulation at 1.55 mum in waveguides grown from the melt of a recently developed organic material.
We propose spatiotemporal solitons that consist of trains of short pulses. The pulses are collectively trapped in the transversal directions by a slow nonlinearity and each pulse is self-trapped temporally by a fast nonlinearity.
Experiments and simulation demonstrate an instability of the intracavity pumped optical parametric oscillator against bidirectional operation. It is shown that nonlinear losses inside the signal cavity can stabilize the bidirectional operation.
A microscopic theory is applied to describe nonlinear terahertz excitations of optically-dark excitons in Cu2O. The theory is quantitatively compared to recent experiments. Signatures of Rabi flopping and ponderomotive contributions are discussed and disentangled.
Using a two stage, white-light seeded, collinear, femtosecond optical parametric amplifier based on BIBO crystal, sub-30-fs signal pulses with energies exceeding 200-muJ, corresponding to 5-fold pulse shortening and ~30% internal conversion efficiency, are generated.
We apply pulse-front matching to a near-IR non-collinear optical parametric amplifier based on a bulk KTiOPO4 crystal. Pulses as broad as ~32 THz at ~1200 nm with almost no angular dispersion could be produced.
We study theoretically and experimentally the strongly-coupled, nonlinear regime of a hot vapor of three-level atoms in an optical cavity. Interesting effects include lasing without inversion and polariton peak splittings.
We demonstrate robust and efficient routing of single photons using a microtoroidal cavity QED system. Single photons from a coherent input are sorted to one output of the fiber with excess photons redirected to the other.
We demonstrate a surface-normal modulator based on free-carrier effect in GaAs and phase-to-amplitude conversion coupling to a single mode fiber. Operation over 1200-2400 nm, modulation depth up to 43% and frequency up to 270 MHz is observed.
We demonstrate broadband spectral phase conjugation based on temporal imaging via four-wave mixing and show for the first time compensation of pulse distortions due to second- and third-order dispersion and self-phase modulation.
Structuring the core of a photonic crystal fiber is used to fulfill the phase-matching condition required for broadband intermodal four-wave mixing. Experimental data show efficient red generation on LP01 mode from 1064 nm pumping.
The THz generation efficiency in two new stilbazolium salts pumped by laser sources at telecommunication wavelengths is increased compared to DAST, the benchmark material for this application.
We review the basic principles of the femtosecond laser direct writing approach. This technology opens the possibility to specifically tune the light evolution in the linear as well as in the nonlinear regime.
Control of optical pulse at visible region is directly demonstrated using pulse trapping by soliton pulse in photonic crystal fibers. Wavelength of trapped pulse is continuously blue-shifted from 0.53 to 0.45 um by power control.
Second-harmonic generation is demonstrated in periodically intermixed GaAs/AlGaAs superlattice waveguides by Type-II phase matching. Second-harmonic powers of 2.0 muW were generated at fundamental phase matching wavelength of 1577.4 nm.
Three-dimensional icosahedral dielectric photonic quasicrystals previously revealed highly structured transmittance spectra and unusual photon transport properties. Using a periodic approximant approach, we show that all these findings are consistent with multiple scattering of light.
We present the theory and experimental realization of simultaneously localized and strongly coupled optical and mechanical modes in periodic nanostructures. The mechanical properties of localized phonons with Gigahertz frequencies and sub-picogram masses are studied via all-optical measurements.
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