Phase conjugation

About: Phase conjugation is a research topic. Over the lifetime, 3694 publications have been published within this topic receiving 49099 citations.

Efficient Phase Conjugation Wave Generation from a GaAs Single Quantum Well in a Microcavity

Abstract: We propose a scheme of efficient phase conjugation wave generation with a semiconductor microcavity. We show experimental results for a GaAs single quantum well (SQW) in a planar AlGaAs microcavity at 13 K. A single pump beam directed normally to the planar cavity produces counterpropagating pump fields in the QW region. Using the quantum confined Stark effect, we tune the exciton resonance energy around the fixed cavity resonance. Large enhancement of the signal occurs when the exciton resonance coincides with the cavity resonance.

Phase conjugation by self-pumped Brillouin-induced four-wave mixing.

Abstract: We report the first observation to our knowledge of self-pumped Brillouin-induced four-wave mixing in a manner analogous to self-pumped four-wave mixing in BaTiO3. Using carbon disulfide as a scattering medium, we have observed both double and treble Brillouin-shifted conjugate beams.

Studies on formation mechanisms of self-pumped phase conjugation in BaTiO 3 :Ce crystals at wavelengths from 570 to 680 nm

Abstract: Formation mechanisms of self-pumped phase conjugation (SPPC) in two BaTiO3:Ce crystals with different doping concentrations have been experimentally studied. The pump beam was from dye lasers, with an overall tunable wavelength region lying between 570 and 680 nm. Variations of the optical beam path patterns as well as reflectivity of the phase conjugators with respect to the incident angle, the incident position, and the wavelength of the pump were investigated in two configurations. One configuration corresponds to that in which the pump enters an a face of the crystal; the other to that in which the pump enters the +c face of the crystal. It was found that SPPC is sometimes established in a way similar to that of a cat phase conjugator, but usually without the formation of a clear beam path loop. Sometimes SPPC is established by a stimulated photorefractive backscattering and four-wave mixing mechanism. In these cases, however, the crystal corners as well as the scattering centers on the crystal faces usually play an important role by seeding the stimulated photorefractive backscattering processes. In other cases SPPC is established by both the cat and the stimulated photorefractive backscattering and four-wave mixing mechanisms.

Dynamic multiple-beam counter-propagating optical traps using optical phase-conjugation.

Abstract: Counter-propagating optical traps are widely used where long working distances, axially symmetric trapping potentials, or standing light waves are required. We demonstrate that optical phase-conjugation can automatically provide a counter-propagating replica of a wide range of incident light fields in an optical trapping configuration. The resulting counter-propagating traps are self-adjusting and adapt dynamically to changes of the input light field. It is shown that not only single counter-propagating traps can be implemented by phase-conjugation, but also structured light fields can be used. This step towards more complex traps enables advanced state-of-the-art applications where multiple traps or other elaborated trapping scenarios are required. The resulting traps cannot only be used statically, but they can be rearranged in real-time and allow for interactive dynamic manipulation.