Observation of Nonlinear Optical Phenomenon in Vacuum by Four Waves Mixing

Mapping Intimacies ◽

10.21203/rs.3.rs-437077/v1 ◽

2021 ◽

Author(s):

Pramila Shukla ◽

Ranjana Prakash

Keyword(s):

Probe Beam ◽

Nonlinear Optical ◽

Four Wave Mixing ◽

Signal Beam ◽

Wave Mixing ◽

Mixing Process ◽

Optical Phenomenon ◽

Optical Effects ◽

Nonlinear Optical Effects ◽

Nonlinear Optical Phenomenon

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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Monochromatic Conical IR Emission from Decaying KrF Laser Filaments in Xenon as Coherent Stimulated Four-Wave Mixing Process

Photonics ◽

10.3390/photonics8020047 ◽

2021 ◽

Vol 8 (2) ◽

pp. 47

Author(s):

Igor V. Smetanin ◽

Alexey V. Shutov ◽

Nikolay N. Ustinovskii ◽

Vladimir D. Zvorykin ◽

Anna V. Bogatskaya ◽

...

Keyword(s):

Transverse Relaxation Time ◽

Four Wave Mixing ◽

Theoretical Background ◽

Wave Mixing ◽

Mixing Process ◽

Optical Phenomenon ◽

Coherent Interaction ◽

Conical Emission ◽

Krf Laser ◽

Ir Emission

We develop theoretical background for the new nonlinear optical phenomenon of narrowly directed monochromatic IR conical emission which has been recently observed when 248-nm UV filaments propagate in xenon (V. D. Zvorykin, et al., Laser Phys. Lett. 13, 125404 (2016)). We treat it as coherent stimulated four-wave mixing process in which two pump KrF laser photons are converted into the coupled pair of resonance IR(828 nm) and VUV (147 nm) photons through 5p5(2P3/2)6p[1/2]0→5p5(2P3/2)6s[3/2]1o and 5p5(2P3/2)6s[3/2]1o→1S0 transitions. We explore the coherent interaction regime which proceeds at a time scale shorter than transverse relaxation time T2. The momentum and energy conservation laws determine the characteristic angle of conical emission. We find that the threshold of this coherent process is determined by the KrF laser pump pulse area.

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Subwavelength Localization of Optical Modes in Fractals

MRS Proceedings ◽

10.1557/proc-351-449 ◽

1994 ◽

Vol 351 ◽

Author(s):

Vladimir Shalaev ◽

R. Botet ◽

M. Moskovits

Keyword(s):

Nonlinear Optical ◽

Optical Excitation ◽

Four Wave Mixing ◽

Local Fields ◽

Wave Mixing ◽

Fractal Clusters ◽

Raman Light Scattering ◽

Optical Effects ◽

Optical Modes ◽

Very High

ABSTRACTResonant optical excitation of fractal clusters generates dipolar eigenmodes which are extremely localized within areas much smaller than the wavelength. The localization occurs due to the fractal morphology and accounts for the very high local fields leading to the huge enhancement of various optical effects. In particular, Rayleigh and Raman light scattering and, especially, nonlinear optical processes, such as 2-photon photoemission and degenerate four-wave mixing, are strongly enhanced in fractal clusters. The spatial distribution of the modes shows the frequency and polarization selectivity.

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Nonlinear Optical Effects in Polymeric Azoesters

Chemistry & Chemical Technology ◽

10.23939/chcht04.03.185 ◽

2010 ◽

Vol 4 (3) ◽

pp. 185-190

Author(s):

Oksana Nadtoka ◽

Keyword(s):

Nonlinear Optical ◽

Electronic Effect ◽

Wave Mixing ◽

Third Order ◽

The Third ◽

Nlo Property ◽

Optical Effects ◽

Nonlinear Optical Effects ◽

Chromophore Concentration ◽

Photochromic Polymers

The new photochromic polymers based on methacrylic azoesters were synthesized. The azobenzene side chains of obtained polymers contain different groups of both acceptor and donor nature as well as flexible alkyl spacer. The third order nonlinear optical susceptibilities (3) of the studied solutions were measured by degenerating four wave mixing (DFWM) method. As a result, the enhancement of the molecular conjugation and the high NLO chromophore concentration in the molecular chain contribute much to heightening the third-order NLO effect. The electronic effect of the substituent on the azobenzol group and the push–pull electronic structure contributes much to enhancing the NLO property

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Effects of three-body interactions on the instabilities and self-oscillations of the four-wave mixing in Bose–Einstein condensates

International Journal of Modern Physics B ◽

10.1142/s0217979217501508 ◽

2017 ◽

Vol 31 (21) ◽

pp. 1750150 ◽

Cited By ~ 1

Author(s):

G. J. Ngounga Makoundit ◽

T. B. Ekogo ◽

A. B. Moubissi ◽

G. H. Ben-Bolie ◽

T. C. Kofane

Keyword(s):

Probe Beam ◽

Mean Field ◽

Field Approximation ◽

Four Wave Mixing ◽

Signal Beam ◽

Mean Field Approximation ◽

Pitaevskii Equation ◽

Wave Mixing ◽

Three Body ◽

Bose Einstein

In this paper, we analyze and discuss instabilities and self-oscillations of four-wave mixing in two-component Bose–Einstein condensates with two- and three-body interatomic interactions. The model is very accurately described in the mean-field approximation by the cubic–quintic Gross–Pitaevskii equation. The relation between the input and output field intensities is multivalued and the effects of the quintic nonlinearity on the self-oscillations of the system are studied. We have also found that the magnitude of the signal beam increases with the increase of the intensity of the probe beam, up to a saturated value, then it decreases with the increase of the intensity of the probe beam. We have shown that the three-body interatomic interactions enhance this saturated value.

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