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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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Journal ArticleDOI
TL;DR: The first observation of stimulated Brillouin scattering (SBS) with BrillouIn lasing, and Brillou in-coupled four-wave-mixing (FWM) in an ultra-high-Q silica microbottle resonator is reported.
Abstract: We report the first observation of stimulated Brillouin scattering (SBS) with Brillouin lasing, and Brillouin-coupled four-wave-mixing (FWM) in an ultra-high-Q silica microbottle resonator. The Brillouin lasing was observed at the frequency of ΩB = 2π × 10.4 GHz with a threshold power of 0.45 mW. Coupling between Brillouin and FWM was observed in both backward and forward scattering directions with separations of 2ΩB. At a pump power of 10 mW, FWM spacing reached to 7th and 9th order anti-Stokes and Stokes, respectively.

36 citations

Journal ArticleDOI
TL;DR: In this article, the authors report experimental observations of spatial shift and splitting of four-wave mixing (FWM) signal beams induced by additional dressing laser beams, which are caused by the enhanced cross-Kerr nonlinearity due to atomic coherence in a two-level atomic system.
Abstract: We report our experimental observations of spatial shift and splitting of four-wave mixing (FWM) signal beams induced by additional dressing laser beams. These effects are caused by the enhanced cross-Kerr nonlinearity due to atomic coherence in a two-level atomic system. The spatial separation and number of the split FWM beams can both be controlled by the intensity of the dressing beam, the Kerr nonlinearity, and atomic density. Theoretical results agree quite well with the observations. Studies of such controlled beam splitting can be very useful in understanding spatial soliton formation and interactions, and in applications for spatial signal processing.

36 citations

Journal ArticleDOI
TL;DR: In this paper, the authors demonstrate the high-efficiency reflection of a probe field in three-level atoms of cesium vapor driven by two counterpropagating coupling fields and show that more than 60$%$ of reflection efficiency is observed at the phase-matching angle.
Abstract: We experimentally demonstrate the high-efficiency reflection of a probe field in \ensuremath{\Lambda}-type three-level atoms of cesium vapor driven by two counterpropagating coupling fields. More than 60$%$ of reflection efficiency is observed at the phase-matching angle. The underlying mechanism theoretically is investigated as the four-wave mixing is enhanced by the electromagnetically-induced transparency. Both of the two Doppler-free two-photon resonances (one for the probe and co-propagating fields, the other for the reflected and the counterpropagation fields) play an important role in satisfying the phase matching in the reflection direction. The phase compensation due to the anomalous dispersion and the decrease of effective absorption length in the atomic system allow the efficient reflection to be observed in a wide range of incident angles of the probe field and detunings of the coupling field.

36 citations

Journal ArticleDOI
TL;DR: In this article, the dispersion-free point associated with a pair of adjacent doublet transitions in atomic and molecular systems is used to observe enormous pulse amplification of a phase-conjugated wavefront and intense visible oscillation without mirror feedback in the degenerate four-wave parametric mixing in sodium vapor doublet at the characteristic wavelength of 5894 A.
Abstract: This paper presents theoretical and experimental descriptions of a novel application of the dispersion-free point associated with a pair of adjacent doublet transitions in atomic and molecular systems. At this point it is possible to observe enormous pulse amplification of a phase-conjugated wavefront and intense visible oscillation without mirror feedback in the degenerate four-wave parametric mixing in sodium vapor doublet at the characteristic wavelength of 5894 A. At the dispersion-free point one also observes an ac Stark-free condition which permits the generation of a new type of coherent optical radiation called "cooperative phased-array radiation" (COPAR) from a phased-array system of coherently excited atoms in the medium at the wavelength.

36 citations

Journal ArticleDOI
TL;DR: In this paper, the resonant nonlinear optical properties of both chemically prepared and electrochemically prepared poly(3-dodecylthiophene) samples using femtosecond degenerate four-wave mixing were investigated.
Abstract: We have investigated the resonant nonlinear optical properties of both chemically prepared and electrochemically prepared poly(3‐dodecylthiophene) samples using femtosecond degenerate four‐wave mixing. The measured χ(3) values for the two polymers are 3×10− 1 0 and 5×10−10 esu at 602 nm. The value of χ(3) at 705 nm is an order of magnitude less. The nonlinearity shows a subpicosecond response. The power dependence of the conjugate reflectivity shows saturation at high input powers. The origin of this saturation is discussed in terms of the saturable absorber behavior. It is concluded that the saturation is consistent with the predictions of simple kinetic models. The origin of the phase conjugate response is discussed in terms of two models: (i) phase space filling model involving unrelaxed excitons and (ii) rapid conformational deformation leading to shift of oscillator strength to photogenerated polaronic states. The analysis of our results favors the mechanism involving unrelaxed excitons as the source of the observed third‐order optical nonlinearity.

36 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202371
2022174
2021158
2020209
2019217
2018246