Polarization rotation due to femtosecond filamentation in an atomic gas

Kosareva, O.G.; Panov, N. A.; Makarov, Vladimir; Perezhogin, I. A.; Marceau, Claude; Chen, Yanping; Yuan, Shuai; Wang, Zhihui; Zeng, Heping; Savel’ev, A. B.; Chin, See Leang

doi:10.1364/ol.35.002904

Cited by 41 publications

(41 citation statements)

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“…It was experimentally registered and theoretically justified that the maximum second harmonic signal after the crossed analyzer is reached for the angle of 45°between ω-2ω initial polarization directions [25]. However, if we consider the yield of the second harmonic signal integrated over all polarization directions in the filament core, it maximizes for the parallel initial orientation of 800 nm and 400 nm polarization directions.…”

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confidence: 93%

“…A theoretical analysis of the filament-induced THz generation requires the inclusion of the full spatiotemporal dynamics of both the 1st and the 2nd harmonic pulses [25]. Our vectorial model is a straightforward extension of the scalar version used in the previous studies of filamentation [19,26], where the ultrashort 800 nm pump pulse is affected by material dispersion, diffraction, Kerr nonlinearity and self-produced plasma.…”

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confidence: 99%

“…It is much easier to detect the 400 nm second harmonic propagating in the forward direction by blocking the pump with 800 nm mirror. Four-wave mixing in the filament leads to the appearance of the second harmonic signal polarized perpendicularly to its original polarization direction [25]. The detection of this signal can be performed by inserting the crossed analyzer after the 800 nm mirror.…”

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confidence: 99%

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Analysis of Dual Frequency Interaction in the Filament with the Purpose of Efficiency Control of THz Pulse Generation

Kosareva

Panov

Volkov

et al. 2011

J Infrared Milli Terahz Waves

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Cross-guiding of the 400 nm second harmonic of the Ti:Sapphire laser in the femtosecond filament produced by an 800 nm pump in argon leads to the efficient terahertz generation along the longitudinally extended high intensity region. Based on the vectorial model of the dual pulse co-propagation we found that terahertz yield due to four-wave mixing in the filament maximizes for the same temporal delay between 400 nm and 800 nm pulses as the 400 nm signal after the analyzer crossed to its initially linear polarization direction. This optimum delay goes up with increasing geometrical focusing distance and leads to the maximum terahertz yield if the initial 800 nm pump and the second harmonic polarization directions are parallel to each other.Keywords Terahertz (THz) generation . Femtosecond filament . Four-wave mixing (FWM)The possibility of low frequency (10 12 -10 13 Hz) electromagnetic pulse generation from femtosecond light filaments in gases has been proposed in [1,2] and demonstrated experimentally in [3,4]. Femtosecond plasma channels can be localized at a desired distance [5,6], producing a remote source of low frequency radiation including the THz range. If the pump pulse at the fundamental 800 nm frequency (ω) of Ti:Sapphire laser amplification system co-propagates together with its second harmonic (2ω) in air or noble gases, the energy of the nonlinearly generated low frequency component might be enhanced

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confidence: 93%

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confidence: 99%

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confidence: 99%

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Analysis of Dual Frequency Interaction in the Filament with the Purpose of Efficiency Control of THz Pulse Generation

Kosareva

Panov

Volkov

et al. 2011

J Infrared Milli Terahz Waves

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“…When a femtosecond laser pulse with power above the critical for self-focusing propagates in air, a number of new physical effects have been observed, such as long-range self-channeling [1,2], coherent and incoherent GHz and THz emission [3,4], asymmetric pulse shaping, super-broad spectra [5,6], self-compression [8], polarization rotation [7] and others. A remarkable effect is also that some of the light pulses propagate over distances of several kilometers in vertical traces, preserving their spectrum and shapes [2].…”

Section: Introductionmentioning

confidence: 99%

The light filament as vector solitary wave

Kovachev¹

2014

AIP Conference Proceedings

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We present an analytical approach to the theory of nonlinear propagation of femtosecond optical pulses with broad-band spectrum in gases. The vector character of the nonlinear third-order polarization is investigated in details, taking into account the carrier to envelope phase. The corresponding system of vector amplitude equations is written by using left-hand and right-hand circular components of the electrical field. We found that this system nonlinear equations admits 3D + 1 vector soliton solution with Lorentz shape. The solution presents relatively stable propagation and rotation with GHz frequency of the vector of the electrical field in plane, orthogonal to the direction of propagation. The evolution of the intensity profile demonstrate weak self-compression and week spherical wave in the first milliseconds of propagation.

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“…Because of the cross focusing phenomenon [15,25] signal and seed pulses propagates together with intense pump pulse, which one is their energy source. If the seed pulse has the central wavelength λ1 in the range 420 -490 nm, the signal pulse, according to (1), will be generated in infrared spectral range with the period of 7 -28 fs (wavelength of 2.2 -8.4 μm).…”

Section: Introductionmentioning

confidence: 99%