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We demonstrate experimentally an optical event horizon in a waveguide structure akin to a hydrodynamic Laval nozzle. The event horizon which forms at the nozzle throat is suggested as a platform for analog gravity experiments.
The optical nonlinearities of the chalcogenide Ge28Sb12Se60 are studied using the z-scan technique with femtosecond and picosecond laser pulses at 1.0 μm. Results indicate this glass shows promise for nonlinear optical waveguide devices.
We demonstrate stable beam self-trapping in soft-matter systems with artificial saturable self-focusing nonlinearities. Our experiments reveal optical beam interactions that can vary from attractive to repulsive as well as an energy exchange.
We report room temperature spin-polarize polariton lasing characteristics and dynamics of a planar InGaAs/GaAs microcavity under non-reasonant circularly polarized picosecond optical excitation.
We optically create an enhanced ferroelectric polarization in ferroelectric/ferromagnet heterostructures that remains stable for over one day, as detected using second harmonic generation. This opens up the possibility of non-contact optically-controlled data storage.
We describe an intracavity doubled continuous wave singly resonant OPO (CW-SHG-SRO), exhibiting tunable operation between 585 and 678 nm. Its frequency is locked to better than 1 kHz over 1 s relatively to a cavity.
We design and demonstrate an efficient fourth-harmonic generation scheme for obtaining femtosecond pulses near 200 nm from the output of a moderately tunable Ti:sapphire ultrafast amplifier. Overall per pulse conversion efficiency of 1.8% is reported.
Super-luminescent jet light is produced via disrupted conical emission excited by focused millijoule 50 fs laser pulses in air. Phase-matching requirement of four-wave mixing at specific diffraction angles is responsible for the observed phenomenon.
Radially symmetric Airy optical beams exhibit a focus area that is strongly non-symmetric and abrupt. We use this unique feature to precisely deliver energy in the bulk of fused silica without affecting the preceding material.
Aqueous suspensions containing pure gold nanoparticles and silica-gold core-shells are shown to exhibit different polarizibilities, thus allowing self-trapping of long needles of light. The different nonlinear mechanisms behind these processes are investigated.
We report a new type of Kerr-like nonlinear media (m-cresol/nylon solutions) exhibiting a giant tunable self-defocusing nonlinearity. Their nonlinear response can be enhanced dramatically by increasing the nylon concentration and is verified to be isotropic.
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