Noncollinear six-wave mixing of femtosecond laser pulses in air

Vaičaitis, V.; Jarutis, Vygandas; Steponkevičius, K.; Stabinis, A.

doi:10.1103/physreva.87.063825

Cited by 19 publications

(16 citation statements)

References 21 publications

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“…This result answers one of the questions posed above: Under strongly non-paraxial conditions, frequency-tripled photons are not generated by a simple FWM process. In the paraxial regime, dependences of the frequency-tripled photon number on the pump power with orders ranging from 3.5 to 5 have been reported [17][18][19][20][21][22][23][24]. Possible explanations for this fifth-order dependence include a SWM process [18,23,24] and FWM with phase matching achieved by by a Kerr effect [17,20,22].…”

Section: B Experimental Resultsmentioning

confidence: 99%

Nonlinear optics with full three-dimensional illumination

Penjweini

Weber

Sondermann

et al. 2019

Optica

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We investigate the nonlinear optical process of third-harmonic generation in the thus far unexplored regime of focusing the pump light from a full solid angle, where the nonlinear process is dominantly driven by a standing dipole-wave. We elucidate the influence of the focal volume and the pump intensity on the number of frequency-tripled photons by varying the solid angle from which the pump light is focused, finding good agreement between the experiments and numerical calculations. As a consequence of focusing the pump light to volumes much smaller than a wavelength cubed the Gouy phase does not limit the yield of frequency-converted photons. This is in stark contrast to the paraxial regime. We believe that our findings are generic to many other nonlinear optical processes when the pump light is focused from a full solid angle. arXiv:1809.10988v2 [physics.optics]

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Section: B Experimental Resultsmentioning

confidence: 99%

Nonlinear optics with full three-dimensional illumination

Penjweini

Weber

Sondermann

et al. 2019

Optica

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“…and other transverse NL effects [7,8]. Interferences between third-and fifth-order processes have been reported for different systems [9].…”

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confidence: 92%

“…HON are still under investigation from the fundamental point of view [4] and there is large interest in phenomena such as liquid light condensates [5], soliton formation [6,7] and other transverse NL effects [7,8]. Interferences between third-and fifth-order processes have been reported for different systems [9].…”

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confidence: 99%

“…The silver colloid was prepared as described in [13,20]: 90 mg of AgNO 3 were diluted in 500 ml of water at 100°C; 10 ml of solution of 1% sodium citrate was added for reducing the Ag + ions, and later was boiled and strongly stirred for 1 h. Subsequently, photofragmentation of the NPs [21] was performed by placing a cuvette containing the pristine colloid in front of the second harmonic beam from a Q-switched Nd: YAG laser (10 Hz,8 ns, 85 mJ/pulse) for 1 h while the suspension was slowly stirred. A homogeneous distribution of spherical NPs (average diameter: 9.0 2.2 ± nm) was obtained.…”

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confidence: 99%

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Nonlinearity management of photonic composites and observation of spatial-modulation instability due to quintic nonlinearity

Reyna

Araújo

2014

Phys. Rev. A

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We present a procedure for nonlinearity management of metal-dielectric composites.Varying the volume fraction occupied by silver nanoparticles suspended in acetone we could cancel the refractive index related to the third-order susceptibility, (3) eff χ , and the nonlinear refraction behavior was due to the fifth-order susceptibility, (5) eff χ . Hence, in a cross-phase modulation experiment, we demonstrated for the first time the effect of spatialmodulation-instability due to (5) eff χ . The results are corroborated with numerical calculations based on a generalized Maxwell-Garnet model. PACS numbers: 42.65.An, 42.65.Jx, 78.67.Bf 2The nonlinear (NL) response of matter to optical fields can be described expressing the induced polarization by a power series of the field with NL susceptibilities, ( ) N χ , 2, 3, N = K , as coefficients of the series [1]. Since all even-order susceptibilities are null in systems with inversion symmetry, the lowest order NL response is generally due to the third-order susceptibility, (3) χ , which contributes for generation of fields that depend on the cubic power of the incident field. Therefore, most of the NL studies are related to (3) χ that is responsible for two-photon absorption, third-harmonic generation, and coherent Raman scattering, among other effects. Cascade processes of (3) χ behave analogously to high-order nonlinearities (HON) and were reported for gases and condensed matter systems [2]. Nevertheless, experiments based on HON, related to direct (not cascade) processes, have been reported for a large variety of systems [3]. HON are still under investigation from the fundamental point of view [4] and there is large interest in phenomena such as liquid light condensates [5], soliton formation [6, 7]and other transverse NL effects [7,8]. Interferences between third-and fifth-order processes have been reported for different systems [9]. It is also of interest the exploitation of HON in quantum information [10], quantum memories [11] and for improvement of high-precision measurements [12].The interest in novel effects related to quintic and cubic-quintic nonlinearities lead several authors to propose experiments with metal-dielectric nanocomposites (MDNC) [7].From the basic point of view MDNC are interesting systems because their NL response can be controlled by changing the nanoparticles (NPs) volume fraction, f (the ratio between the volume occupied by the NPs and the host). Indeed, the interest in the NL properties of MDNC is large in nanoscience and nanotechnology [13][14][15][16][17][18].

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“…However, in a noncollinear geometry we must consider the projection of the driving laser wave vectors along the direction of the harmonic emission due to the angular differences between them (Fig. 1e-f) [28,43,[48][49][50]. This projection results in a modified phase-matching equation:…”

Section: Introductionmentioning

confidence: 99%