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: The use of DFWM as an ultrafast time gate for the detection of ballistic light in optical mammography appears to hold great promise for improving the current state of the art.
Abstract: Optical imaging through turbid media is demonstrated using a degenerate four-wave mixing correlation time gate. An apparatus and method for detecting ballistic and/or snake light while rejecting unwanted diffusive light for imaging structures within highly scattering media are described. Degenerate four-wave mixing (DFWM) of a doubled YAG laser in rhodamine 590 is used to provide an ultrafast correlation time gate to discriminate against light that has undergone multiple scattering and therefore has lost memory of the structures within the scattering medium. Images have been obtained of a test cross-hair pattern through highly turbid suspensions of whole milk in water that are opaque to the naked eye, which demonstrates the utility of DFWM for imaging through turbid media. Use of DFWM as an ultrafast time gate for the detection of ballistic and/or snake light in optical mammography is discussed.
65 citations
TL;DR: In this paper, the influence of inter-bit four-wave mixing on optical time division multiplexed transmission was investigated and it was shown that the effect is caused by pulse broadening due to fiber dispersion and four-waving mixing between overlapped pulses.
Abstract: The authors investigate the influence of inter-bit four-wave mixing on optical time division multiplexed transmission The effect is caused by pulse broadening due to fibre dispersion and four-wave mixing between overlapped pulses The authors also confirm this effect experimentally and show that there is an optimum pulsewidth to reduce both four-wave mixing and self-phase-modulation effects
65 citations
TL;DR: In this paper, the degenerate three-wave and four-wave phase conjugation was generalized to include signal-pump detuning and the theory is an extension of grating-dip spectroscopy.
Abstract: The formulations of degenerate three-wave and four-wave phase conjugation are generalized to include signal-pump detuning The theory is an extension of grating-dip spectroscopy The reflection bandpass is shown to be limited by the power-broadened bandwidth (∝1/T1) of the two-level population difference Unlike for running-wave saturation, the signal-absorption coefficient saturated by a standing wave shows virtually no gain regions
65 citations
TL;DR: In this paper, a nonlinear fiber with a gain that has symmetric lateral frequency bands is found to generate a stable train of bright or dark pulses with a well-defined repetition rate.
Abstract: A nonlinear fiber with a gain that has symmetric lateral frequency bands is found to generate a stable train of bright or dark pulses with a well-defined repetition rate. The pulse train is generated from noise; the pulses are unchirped, and their amplitude and repetition rate are determined by the parameters of the system. The underlying mechanism for this pulse formation is recognized as dissipative four-wave mixing in which only two frequencies are nonnegligible; one near the maximum gain transmits energy by wave mixing to its third harmonic, which is in the region of negative gain. An implicit analytical expression for the pulse train solution is derived. It is demonstrated that dissipative four-wave mixing can be employed to yield passive mode locking in a fiber ring laser consisting of only a filter and an active fiber. The resulting train of pulses is shown to have a high soliton content.
65 citations
TL;DR: In this paper, the authors studied the four-wave mixing effect in a coupled semiconductor quantum dot-spherical metal nanoparticle structure and found that there is a critical distance that changes the form of the spectrum.
Abstract: We study the four-wave mixing effect in a coupled semiconductor quantum dot-spherical metal nanoparticle structure. Depending on the values of the pump field intensity and frequency, we find that there is a critical distance that changes the form of the spectrum. Above this distance, the four-wave mixing spectrum shows an ordinary three-peaked form and the effect of controlling its magnitude by changing the interparticle distance can be obtained. Below this critical distance, the four-wave mixing spectrum becomes single-peaked; and as the interparticle distance decreases, the spectrum is strongly suppressed. The behavior of the system is explained using the effective Rabi frequency that creates plasmonic metaresonances in the hybrid structure. In addition, the behavior of the effective Rabi frequency is explained via an analytical solution of the density matrix equations.
65 citations