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We consider, theoretically and experimentally, the tunneling of a plane wave through a refractive index barrier in a self-defocusing medium. We demonstrate nonlinear modifications to the transmission rate and observe distinctive, kinetic-energy-dependent hysteresis effects.
We experimentally observe a spatial optical shock with negative pressure/self-focusing nonlinearity on a partially-spatially-incoherent light. We examine its basic nonlinear properties and observe statistical wave damping.
The holographic reconstruction of objects typically assumes that the object is axially thin. Here, we demonstrate a simple approach that works for axially-thick potentials which evolve dynamically. Results are verified by reconstructing linear scattering experiments.
We study nonlinear beam propagation in a fractal waveguide array, created by optically-inducing nested periodic arrays in a self-defocusing photorefractive crystal. Nonlinear mode coupling and energy transport between the folded bands is demonstrated.
We observe the propagation of 1D Airy beams through an unbiased photorefractive crystal. For ordinary polarization, the beam diffracts, while for extraordinary polarization it experiences nonlinearity through charge diffusion and has its diffraction suppressed.
Nonlinear self-filtering and amplification of noisy, low-level images is demonstrated in a self-focusing photorefractive medium. Signal recovery depends sensitively on the parameters of the system and represents a new dynamical type of stochastic resonance.
We demonstrate, theoretically and experimentally, an all-optical Rayleigh-Taylor instability. Observations of the characteristic spatial period as a function of intensity difference, nonlinearity, and refractive index gradient show excellent agreement with analytical calculations from perturbation theory.
We consider the propagation of a partially-coherent spatial beam in both self-focusing and self-defocusing nonlinear media. Measurements of beam widths for both nonlinearities confirm theoretical predictions based on a nonlinear Gaussian-Schell model.
We study, theoretically and experimentally, beam dynamics and interaction in a self-defocusing medium with spatial nonlocality. By varying the beam separation and distance to boundaries, we demonstrate an effective method of controlling beam trajectories.
We extend the technique of digital holography to the case of propagation through nonlinear media. We experimentally verify the technique by reconstructing nonlinear wave dynamics within a self-defocusing medium and nonlinearly imaging through it.
We study, experimentally and theoretically, the modulation instability of a mixture of coherent and spatially-incoherent beams. In contrast with incoherent-MI, which requires a threshold nonlinearity, we show that any amount of coherent component triggers instability.
We experimentally and theoretically study nonlinear propagation in a rotating waveguide array, created by propagating a self-rotating vortex lattice inside a self-defocusing photorefractive crystal. Non-inertial effects on discrete diffraction and soliton formation are observed.
We experimentally study dispersive optical shock waves on a partially-spatially-incoherent background. We observe statistical wave damping and demonstrate shock waves using both self-defocusing and self-focusing nonlinearities, corresponding to positive and negative optical fluid pressures.
We demonstrate a spatial, all-optical version of steganography in a nonlinear medium. After hiding a coherent image in spatially-incoherent noise, we recover the signal by seeding modulation instability in a self-focusing photorefractive crystal.
We experimentally demonstrate degenerate four-wave mixing effects in a defocusing nonlinear photorefractive medium, in both one and two transverse dimensions.
We present the first observation of defect dynamics in 2D nonlinearly interacting photonic quasicrystals. In addition, we present experiments showing linear ldquodiscreterdquo diffraction from various lattice sites and lattice solitons in photonic quasicrystals.
We report the first experimental observation of gap random-phase lattice solitons. We observe their self-trapping conformed to the lattice periodicity in real space, as well as their multi-humped power spectrum in k-space.
We experimentally demonstrate superfluid-like optical spatial shock waves. We examine their basic nonlinear properties in both 1D and 2D and demonstrate collisions between two such shocks.
We report on the observation of a 1D and 2D dark notch in an unpoled SBN:75 crystal using the quadratic electro-optic effect. Both the 1D and 2D dark notches are observed to be fixed in the crystal
We introduce a novel experimental technique: imaging the Fourier power spectra of beams propagating in nonlinear photonic lattices. As applications, we present Brillouin zone spectroscopy and a direct observation of nonlinear energy transfer in k-space
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