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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 article, a 1.5μm tensile-strained quantum-well optical amplifier has been studied by highly nondegenerate four-wave mixing at detuning frequencies up to 1.7 THz, and frequency response data indicate the presence of two ultrafast physical processes with characteristic relaxation lifetimes of 650 fs and <100 fs.
Abstract: Ultrafast dynamics in a 1.5‐μm tensile‐strained quantum‐well optical amplifier has been studied by highly nondegenerate four‐wave mixing at detuning frequencies up to 1.7 THz. Frequency response data indicate the presence of two ultrafast physical processes with characteristic relaxation lifetimes of 650 fs and <100 fs. The longer time constant is believed to be associated with the dynamic carrier heating effect. This is in agreement with previous time‐domain pump‐probe measurements using ultrashort optical pulses.
87 citations
TL;DR: In this paper, the authors measured the third order susceptibility for doubly vibrationally enhanced four wave mixing in the model system, acetonitrile, and showed that two resonances multiplicatively increase the mixing efficiency if there is mode coupling and provide an additional spectral dimension for vibrational spectroscopy.
Abstract: We report the measurement of the third order susceptibility ${\ensuremath{\chi}}^{(3)}$ for doubly vibrationally enhanced four wave mixing in the model system, acetonitrile. Two resonances multiplicatively increase the mixing efficiency if there is mode coupling and provide an additional spectral dimension for vibrational spectroscopy that greatly improves its resolution. Such methods promise to have important applications for vibrational spectroscopy of complex materials.
87 citations
TL;DR: In this article, the authors examined the generation of correlated photons using χ(3) parametric processes in optical fibres and showed that using such processes provides a simple and inexpensive correlated photon source readily compatible with communications technologies.
Abstract: Correlated photons have been used in quantum optics for the generation of squeezed light, demonstration of quantum interference effects, quantum cryptography, Einstein-Podolsky-Rosen experiments and most recently, quantum teleportation. Usually, they are generated using χ(2) parametric processes to take advantage of large χ(2) nonlinearities and to wavelength separate the correlated photons from the pump photons. Here, we examine the generation of correlated photons using χ(3) parametric processes in optical fibres. We show that using such processes provides a simple and inexpensive correlated photon source readily compatible with communications technologies.
86 citations
TL;DR: In this article, the authors use acetonitrile in different mixtures as a model system to demonstrate the spectral selectivity that allows DOVE methods to remove the spectral congestion from vibrational spectra of complex mixtures and to discriminate against a strong water background.
Abstract: A new form of vibrational spectroscopy has recently been demonstrated using three coherent sources to generate nonlinear four wave mixing (FWM). It is an optical analogue of 2D NMR. The four transitions that occur in FWM include combinations of infrared absorption and Raman transitions and result in doubly vibrationally enhanced (DOVE) four wave mixing (FWM). In this paper, we use acetonitrile in different mixtures as a model system to demonstrate the spectral selectivity that allows DOVE methods to remove the spectral congestion from vibrational spectra of complex mixtures and to discriminate against a strong water background. The selectivity results from two multiplicative vibrational enhancements and the intra- and intermolecular interactions that cause mode coupling. Since DOVE features cannot occur in the absence of mode coupling, these methods isolate the spectral features that are associated with interactions. This method promises to have important applications for probing complex biological, chemi...
86 citations
TL;DR: In this article, the transmission of a 4 × 10 Gbit/s OTDM data sequence is demonstrated for the first time over 406 km of non-dispersion shifted fibre.
Abstract: The transmission of a 4 × 10 Gbit/s OTDM data sequence is demonstrated for the first time over 406 km of non-dispersion shifted fibre. Four wave mixing in a 2 mm long semiconductor optical amplifier was used to compensate for dispersion via mid-span spectral inversion. A record 45 dB signal-to-noise ratio in a 0.1 nm bandwidth was obtained for the spectrally inverted signal.
86 citations