Topic
Four-wave mixing
About: Four-wave mixing is a research topic. Over the lifetime, 7530 publications have been published within this topic receiving 112702 citations.
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TL;DR: In this paper, backward coherent emission (DFWM) from 2D excitons comparable in efficiency to that in forward direction was observed, which is extremely advantageous and useful in exploring optically thin semiconductor layers.
Abstract: Time‐resolved degenerate four‐wave mixing (DFWM) on two‐dimensional (2D) excitons in GaAs single quantum wells is studied. We observe backward coherent emission (DFWM signal) from the 2D excitons comparable in efficiency to that in forward direction. This reflection or backward DFWM configuration is extremely advantageous and useful in exploring optically thin semiconductor layers.
51 citations
TL;DR: The experiments demonstrate how photodiffractive behavior using the large resonant nonlinearities of quantum-confined excitons yields highly sensitive material for optical image processing.
Abstract: We have performed photodiffractive four-wave mixing in semi-insulating multiple GaAs/AlGaAs quantum wells at a wavelength of 0.83 μm. The quantum wells were made semi-insulating by proton implantation, which introduces defects that are available to trap and store charge during holographic recording. The experiments demonstrate how photodiffractive behavior using the large resonant nonlinearities of quantum-confined excitons yields highly sensitive material for optical image processing. When pump powers of 1 mW/cm2 are used, the measured sensitivity is 2 orders of magnitude greater than that of bulk, nonresonant photorefractive semiconductors.
51 citations
TL;DR: In this paper, a design theory of the four-wave mixing (FWM) devices using optical fibers is presented, and it is shown that the signal-to-idler conversion process in the zero-dispersion wavelength region yields the widest conversion bandwidth, and the conversion efficiency can be maximized by choosing the optimum fiber length.
Abstract: A design theory of the four-wave mixing (FWM) devices using optical fibers is presented. We find that the signal-to-idler conversion process in the zero-dispersion wavelength region yields the widest conversion bandwidth, and the conversion efficiency can be maximized by choosing the optimum fiber length. The maximum conversion efficiency thus obtained is proportional to the square of the input pump power, but is limited by the stimulated Brillouin scattering (SBS) process in the fiber. We show experimentally the improvement of the conversion efficiency by the SBS suppression and the validation of the proposed theory. >
51 citations
Patent•
08 Dec 2000
TL;DR: In this article, the dispersion shifted medium is designed to produce a set of discrete wavelengths, by such means as four wave mixing, whose frequencies are related to the wavelength of the pulsed laser sources and the repetition frequency of the resonant cavity.
Abstract: This invention provides a means for generating multiple wavelengths in an integrated manner using a resonant cavity containing dispersion shifted medium and coupled to at least one pulsed laser source. The laser sources emit radiation at a particular wavelength and are pulsed in a manner synchronously related to the round trip time of the resonant cavity. The dispersion shifted medium is designed to produce a set of discrete wavelengths, by such means as four wave mixing, whose frequencies are related to the wavelength of the pulsed laser sources and the repetition frequency of the resonant cavity. The reflective elements of the resonant cavity are designed to contain the radiation of the laser sources within the resonant cavity and to transmit an equal amount of each of the generated set of wavelengths.
51 citations
TL;DR: The generation of the time-reversed replica of an incident monochromatic image-bearing optical beam that is nonuniformly polarized is demonstrated and sources of distortion in the vector replica are discussed using standard theory of nonlinear beam interaction.
Abstract: We demonstrate the generation of the time-reversed replica of an incident monochromatic image-bearing optical beam that is nonuniformly polarized. A form cf degenerate four-wave mixing in liquid CS2 of beams at 532 nm is employed. We discuss sources of distortion in the vector replica using standard theory of nonlinear beam interaction.
51 citations