Kerr-driven nonlinear refractive index of air at 800 and 400 nm measured through femtosecond laser pulse filamentation

Geints, Yu. É.; Kabanov, A. M.; Zemlyanov, A. A.; Bykova, E. E.; Букин, О. А.; Golik, S. S.

doi:10.1063/1.3657774

Cited by 37 publications

(15 citation statements)

References 14 publications

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“…(2-6) with the relevant pulse duration and energies, and with a fit of B xxxx = 2.36 × 10 −7 cm 3 /erg • s, B ′ xxxx = 2.58 × 10 −7 cm 3 /erg • s and τ n = 14.2 ps. The third-order nonlinear susceptibility χ (3) can be estimated by χ (3) ≈ 3B xxxx τ n = 1.006 × 10 −17 cm 3 /erg, and then the delayed nonlinear refractive index coefficient n 2,d = 12π 2 χ (3) /n 2 0 c = 3.97 × 10 −19 cm 2 /W , which is close to the reported value of ∼ 3.01 × 10 −19 cm 2 /W in literature 20,21 . The fit in Fig.…”

Section: Fig 2 (Color Online)supporting

confidence: 87%

Energy Exchange between Femtosecond Laser Filaments in Air

et al. 2010

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We experimentally demonstrate energy exchange between a delay-tuned femtosecond beam and two delayfixed ones as they spatiotemporally overlapped and experienced filamentation in air. The energy exchange process in the relative time delay is dramatically elongated up to 40 ps in the presence of plasma grating, indicating that filamentary beams coupling may be an effective method for filament control.

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Section: Fig 2 (Color Online)supporting

confidence: 87%

Energy Exchange between Femtosecond Laser Filaments in Air

et al. 2010

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“…The multiphoton photoionization rate I W is calculated using the Perelomov-Popov-Terent'ev model [46], which is applied to a gas mixture simulating atmospheric air (20%O 2 +80%N 2 ) at the total neutral molecule concentration of 2.5•10 19 cm -3 . The critical self-focusing power c P of laser radiation at the wavelength of 800 nm in air is set as 3.2 GW [47].…”

Section: Fundingmentioning

confidence: 99%

Dynamics of femtosecond synthesized coronary profile laser beam filamentation in air

Geints

Zemlyanov

2021

J. Opt.

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Multiple filamentation in air of high-power ultrashort laser radiation with transverse intensity profile resembling a "corona" composed by incoherent combining of several annularly distributed independent top-hat sub-beams is theoretically studied. Through the numerical solution of timeaveraged nonlinear Schrodinger equation, we study the spatio-angular dynamics of synthesized near-infrared "corona-beam" (CB) along the optical path by varying the number and power of the beamlets (corona-spikes). For the first time to our knowledge, the evident advances in the multiplefilamentation region manipulating of synthesized CB are demonstrated. Particularly, by adjusting the number and aperture of the constituting sub-beams it makes possible to significantly delay the CB filamentation onset distance and increase the filamentation length in air. In addition, at the postfilamentation stage of femtosecond pulse propagation under certain conditions the synthesized corona-beams exhibit significantly lower angular divergence of its most intense part (postfilamentation light channel) compared to the beams with regular unimodal intensity profiles (Gaussian, plateau-like) that provides enhancing of laser power delivered to the receiver over the atmospheric links.

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“…depending on the propagation direction. The calculation shows that the nonlinear refractive index of vacuum (n 2,vac = 1.36 × 10 −29 cm 2 /W for n 2,vac = 4κ/c 0 ) is 3 × 10 10 times lower than that of air (n 2,air = 4 × 10 −19 cm 2 /W) at 800 nm wavelength [52] and 10 19 times lower than that of water [53].…”

Section: A Nonlinear Birefringent Vacuum Induced By the Transverse Magnetic Mode Fieldmentioning

confidence: 92%

Photon scattering by a 4π -spherically-focused ultrastrong electromagnetic wave

et al. 2020

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The scattering of high-power probe laser pulses by tightly focused ultrastrong laser pulses has been investigated through a semiclassical approach using a perturbative method based on the Born approximation. Under a 4π-spherically-focused ultrastrong light field, the electric permittivity and magnetic permeability tensors for vacuum are calculated from the Euler-Heisenberg Lagrangian to show the nonlinear birefringent property of vacuum. And, from permittivity and permeability tensors, the scattering potential is derived for the Born approximation. The first-order solution of the Born approximation is taken as an electric field scattered from the 4π-spherically-focused laser pulse when a probe laser pulse propagates through the focused laser field. The differential cross section of the nonlinear birefringent vacuum is derived, and the number of photons scattered from the nonlinear birefringent vacuum is analyzed in the laser power range of 10-1000 PW.

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Kerr-driven nonlinear refractive index of air at 800 and 400 nm measured through femtosecond laser pulse filamentation

Cited by 37 publications

References 14 publications

Energy Exchange between Femtosecond Laser Filaments in Air

Energy Exchange between Femtosecond Laser Filaments in Air

Dynamics of femtosecond synthesized coronary profile laser beam filamentation in air

Photon scattering by a 4π -spherically-focused ultrastrong electromagnetic wave

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