Alfvén wave mixing and non-JWKB waves in stellar winds
Wave mixing equations for Alfvén waves in the solar wind were developed in a series of papers on non-JWKB Alfvén waves and wave driven winds (e.g. Heinemann and Olbert 1980, Barkhudarov 1991, Hollweg 1996, Velli 1993, MacGregor and Charbonneau 1994).A formalism for locally incompressible turbulence in the solar wind, using similar …
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Frontiers | Spatial Manipulation via Four-Wave …
In a recent publication [S. Gan, Laser Phys. 31, 055401 (2021)], a scheme for controlling the vortex four-wave mixing (FWM) in a five-level atomic system has been put forward. Based on this work, we …
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Data-driven model discovery of ideal four-wave mixing in …
Four-wave mixing is a central process in nonlinear fibre optics, but its observation in isolation has been problematic because the wave mixing processes cascade with distance to generate multiple ...
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Four-Wave Mixing
Four-wave mixing is a major source of nonlinear crosstalk for WDM systems [67–74]. The physical origin of FWM-induced crosstalk, and the resulting system degradation, ... The forward pump beam interferes with the probe beam to produce a grating in the photorefractive material. The backward pump beam is then diffracted to produce a beam …
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Four-wave mixing, explained by RP; FWM, optical …
Four-wave mixing (FWM) involves the interaction between three input light beams with different wavelengths that are overlapping in time to produce a fourth wavelength. The …
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Continuous wideband microwave-to-optical converter based …
Continuous-wave conversion of a 13.9 GHz field to a near-infrared optical signal is demonstrated by using Rydberg atoms at room temperature. The conversion bandwidth is 16 MHz and the conversion ...
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Distributed analysis of nonlinear wave mixing in fiber due to forward
Forward stimulated Brillouin scattering (F-SBS) is a third-order nonlinear-optical mechanism that couples between two co-propagating optical fields and a guided acoustic mode in a common medium. F-SBS gives rise to nonlinear wave mixing along optical fibers, which adds up with four-wave mixing induced by the Kerr effect. In this …
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Frequency-shift free optical phase conjugation using counter
A third forward propagating pump, together with one of the initial pumps, signal and idler interact via FWM process to generate phase conjugation. In [11, 12], frequency-shift free phase conjugated wave was co-propagated with signal and shift of polarization in conjugated wave assisted the filtering of conjugate. However in our …
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Forward four-wave mixing with defocusing …
We experimentally demonstrate degenerate, forward four-wave mixing effects in a self-defocusing photore-fractive medium, in both one and two transverse dimensions. We …
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Dressed Gain from the Parametrically Amplified Four-Wave Mixing …
With a forward cone emitting from the strong pump laser in a thermal rubidium atomic vapor, we investigate the non-degenerate parametrically amplified four-wave mixing (PA-FWM) process with ...
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Degenerate Four Wave Mixing
Degenerate Four Wave Mixing. 418 1,064nm DFWM studies on PMMA films containing (158) show that an increase in n2 is offset by an increase in the linear absorption coefficient α1, leading to a lower figure of merit W compared with the solution (W=Δnsat/α1λ, where Δnsat is the maximum change in refractive index, which is the product of n2 and the …
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Intensity correlations in the forward four-wave mixing …
Intensity correlations in the forward four-wave mixing driven by a ...
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Squeezed-state generation via forward degenerate four-wave mixing
On the other hand, the nominally copropagating beam geometry of forward degenerate four-wave mixing is shown to alleviate the absolute probe-conjugate loss limit on squeezing. AB - Degenerate four-wave mixing has been suggested as a possible generation scheme for squeezed-state light. A recent analysis of the quantum effects of …
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Observation of nonlinear optical phenomenon in vacuum by four waves mixing
Abstract. In the present paper, we studied possibility of observation and detection of nonlinear optical effects in free space. We studied four wave mixing process in which signal is generated opposite to the direction of probe beam. We observed that large number of photons are generated in signal beam, which should be detectable.
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Leveraging nonlinear wave mixing in rough contacts-based …
Wave mixing, however, ... For certain cases, the transmitted wave in the forward and backward directions contain the same frequencies but different energy. These cases correspond to (1) when one of the input frequencies is in the pass band, while the other input frequency and all nonlinearly-generated frequencies are in band gaps, and (2) …
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Wavefront shaping with nonlinear four-wave mixing
Wavefront shaping with nonlinear four-wave mixing. Dongyi Shen, Jianjun Cao & Wenjie Wan. Scientific Reports 13, Article number: 2750 ( 2023 ) Cite this article. …
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(PDF) Dressed Gain from the Parametrically Amplified Four-Wave Mixing
Abstract and Figures. With a forward cone emitting from the strong pump laser in a thermal rubidium atomic vapor, we investigate the non-degenerate parametrically amplified four-wave mixing (PA ...
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arXiv:2104.11649v1 [physics.optics] 23 Apr 2021
four-wave mixing processes including, e.g., third-harmonic generation, and features various models for the Raman response. The propagation equations are solved on a periodic …
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Study on the asymptotic behavior of the interplay of …
We theoretically study stimulated Brillouin scattering (SBS) in a standard single-mode fiber (SMF), taking Brillouin-enhanced four-wave-mixing (BEFWM) effects into account. In particular, we investigate the case when there is non-negligible back-reflection of the forward-pump field at the rear fiber end although such reflection is typically weak and …
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Time-reversed wave mixing in nonlinear optics
The wave-mixing behavior of SHG process in the first nonlinear medium is time-reversed in the second (outlined in dashed box). The condition for time-reversal symmetry is obtained by adding a π ...
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(PDF) Exceptional Points of Degeneracy with Indirect
Exceptional Points of Degeneracy with Indirect Bandgap Induced By Mixing Forward and Backward Propagating Waves. May 2022; ... Two coupled Si layers where the top one supports a forward wave (in ...
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Distributed analysis of nonlinear wave mixing in fiber …
Forward stimulated Brillouin scattering (F-SBS) is a third-order nonlinear-optical mechanism that couples between two co-propagating optical fields and a guided …
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Intensity correlation in four-wave mixing
We consider the generation of four-wave-mixing signals by an ensemble of two-level atoms interacting with broadband, correlated, pump and probe fields in the forward geometry. We show how the calculation of the four-wave-mixing signal reduces to the solution of six coupled Langevin equations that are numerically integrated using Monte Carlo ...
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Invited Article: Distributed analysis of nonlinear wave mixing …
Forward stimulated Brillouin scattering (F-SBS) is a third-order nonlinear-optical mechanism that couples between two co-propagating optical fields and a guided …
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Exceptional Points of Degeneracy with Indirect Bandgap …
wave is a forward and the other one is backward [13]. The mixing of the two waves constitutes what is called the guiding system's eigenmode (some call it "supermode") which is a weighted sum of the individual guided waves. The eigenmode propagation constant is determined by solving the characteristic equation of the coupled system in (2 ...
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Phys. Rev. A 107, 012214 (2023)
Figure 1 (a) Coupling between two electromagnetic waves whose complex amplitudes are A and B.Conditions that lead to EPDs are obtained by introducing proper coupling between (b) two waveguides with PT symmetry where the two media have gain and loss supporting exponentially growing and attenuating waves and (c) two waveguides …
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High-efficiency backward four-wave mixing by quantum interference …
Abstract. Electromagnetically-induced-transparency-based four-wave mixing (FWM) in a resonant four-level double-Λ system has a maximum conversion efficiency (CE) of 25% due to spontaneous ...
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Photonics | Free Full-Text | Dispersion-Oriented Inverse …
In this paper, we demonstrate the application of a deep learning neural network (DNN) in the dispersion-oriented inverse design of photonic-crystal fiber (PCF) for the fine-tuning of four-wave mixing (FWM). The empirical formula of PCF dispersion is applied instead of numerical simulation to generate a large dataset of phase-matching …
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Time-reversed wave mixing in nonlinear optics | Scientific …
The result demonstrates two operating states of a wave-mixing process in its forward and time-reversed direction. Nevertheless, in our experiment, the gain depletion regime is never reached.
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Wave Mixing Process in an Atomic Vapor
SCIENTIFIC REPORTS 5:15058 DOI: 10.1038srep15058 1 Dressed Gain from the Parametrically Amplified Four-Wave Mixing Process in an Atomic Vapor ZhaoyangZhang1, Feng Wen1, Junling Che1, DanZhang1, Changbiao Li1, Yanpeng Zhang 1 & Min Xiao2 With a forward cone emitting …
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