We discuss the possibility of observing atomic phase conjugation from Bose condensates, and using it as a diagnostic tool to access the spatial coherence properties and to measure the lifetime of the condensate. We argue that since phase conjugation results from the scattering of a partial matter wave off the spatial grating produced by two other waves, it offers a natural way to directly measu...

We examine experimentally the time-reversal properties of Berry's geometrical phase in one of its optical manifestations, Pancharatnam's phase, through the use of optical phase conjugation. The time-reversal symmetry of the total optical system is broken by a nonreciprocal element, a Faraday rotator. Nevertheless, we find that the geometrical part of the phase acquired by an optical wave in pas...

The ability of nonlinear optical phase-conjugate mirrors (PCM's) to correct for linear refractive-index inhomogeneities has been demonstrated both theoretically1'2 and experimentally.2 Propagation media often possess intensity-dependent indices of refraction that cause severe propagation distortion, such as thermal blooming and self-focusing. These distortions are often manifested in high-inten...

Over the last three decades, optical phase conjugation (OPC) has been one of the major research subjects in the field of nonlinear optics and quantum electronics. OPC defines usually a special relationship between two coherent optical beams propagating in opposite directions with reversed wave front and identical transverse amplitude distributions. The unique feature of a pair of phase-conjugat...

Isotropic optical focusing - the focusing of light with axial confinement that matches its lateral confinement, is important for a broad range of applications. Conventionally, such focusing is achieved by overlapping the focused beams from a pair of opposite-facing microscope objective lenses. However the exacting requirements for the alignment of the objective lenses and the method's relative ...

A phase conjugation array (time-reversal mirror) time reverses the incident signal and precisely returns it to its original source location. A high frequency (~3.5 kHz) phase conjugation array (HFPCA) has been designed, fabricated, and deployed at sea in two experiments (July 1999 and May/June 2000) conducted jointly with the NATO SACLANT Undersea Research Centre. The HFPCA consists of 29 sourc...

A method for sustaining multiply exposed photorefractive holograms, in a phase-locked fashion, by using a pair of phase-conjugating mirrors is described. It is shown that a steady state exists where the overall diffraction efficiency is independent of the number of holographic exposures and the tlnal holograms are exactly in phase.with the initial ones. Both analytical and experimental results ...

Probabilistic constellation shaping is studied and developed for optical phase conjugation (OPC)-based nonlinearity compensation of Kerr nonlinearities in fiber links. The mid-link OPC scenario considered dispersion compensated systems. It demonstrated simulations experimentally that transmission strategies optimal classical additive white Gaussian noise (AWGN) channels can be sub-optimal these...