Transverse effects in ultrabroadband multifrequency Raman generation

Syed, K.S.; McDonald, GS; New, G.H.C.

doi:10.1364/josab.17.001366

Cited by 14 publications

(7 citation statements)

References 19 publications

(33 reference statements)

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“…where XNL ls tne scalar third-order susceptibility of the neutral gas and the brackets ( ) ( Stimulated Raman scattering of laser pulses propagating through air has been studied extensively [28,[53][54][55][56][57][58][59][60][61][62][63]. For altitudes below 100 km, the dominant Raman process for long pulses ( ~ nsec) is due to scattering from N 2 molecules involving the S(8) rotational transition from the J=8 to J=6 rotational states, while the molecule remains in the vibrational ground state [55].…”

Section: A) Nonlinear Polarization Of Bound Electronsmentioning

confidence: 99%

Propagation of intense short laser pulses in the atmosphere

2002

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Approved for public release; distribution is unlimited. LUULUJUIJ U0"t REPORT DOCUMENTATION PAGEForm Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. ABSTRACT {Maximum 200 words)The propagation of short, intense laser pulses in the atmosphere may have applications in the areas of active and passive remote sensing, electronic countermeasures, and induced electric discharges. For example, localized ultraviolet radiation generated at a remote distance can provide a source for active fluorescence spectroscopy of biological and chemical agents in the atmosphere. The generated directed pulses of intense white light may find applications in the areas of hyperspectral imaging and differential absorption spectroscopy. The propagation of short, intense laser pulses through the atmosphere is investigated. A 3D, nonlinear propagation equation is derived which includes the effects of dispersion, nonlinear self-focusing due bound electrons, stimulated molecular Raman scattering, multiphoton and tunneling ionization, pulse energy depletion due to ionization, relativistic focusing and pondcromotively excited plasma wakefields. A method for generating a remote spark in the atmosphere is proposed. Examples involving beam focusing, compression, ionization, and white light generation are studied by numerically solving the full set of 3D, nonlinear propagation equations. Coupled equations for the spot size, plasma density and power, allowing for pulse energy depletion due to ionization are derived, demonstrating the absence of extended self-guided propagation.

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Section: A) Nonlinear Polarization Of Bound Electronsmentioning

confidence: 99%

Propagation of intense short laser pulses in the atmosphere

2002

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“…The two terms can then be straightforwardly summed, and since ω j = ω 0 + ω ′ j , from eqns. (15,16,17), we get…”

Section: Multi-field Raman Theorymentioning

confidence: 95%

“…The single-field Raman model can be converted into a traditional multi-field model as developed in e.g. HPB [10] or Syed, McDonald and New [15] by replacing the field envelope with a sum of multiple envelopes using carrier exponentials spaced at the Raman frequency. When doing this, we will only get the correct multi-field form if few-cycle (either SEWA or GFEA) corrections to the field evolution part of the theory are applied to the effective polarization caused by the Raman transition.…”

Section: Multi-field Raman Theorymentioning

confidence: 99%

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Wideband pulse propagation: Single-field and multifield approaches to Raman interactions

Kinsler

New

2005

Phys. Rev. A

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We model the process of ultra broadband light generation in which a pair of laser pulses separated by the Raman frequency drive a Raman transition. In contrast to the usual approach using separate field envelopes for the different frequency components, we treat the field as a single entity. This requires the inclusion of few-cycle corrections to the pulse propagation. Our single-field model makes fewer approximations and is mathematically (and hence computationally) simpler, although it does require greater computational resources to implement. The single-field theory reduces to the traditional multi-field one using appropriate approximations.

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“…Though the interplay between spatial and temporal dynamics in nonlinear media has recently become an active research topic, see, e.g. [9], it has failed so far to exploit many of the promising consequences of the strong spatio-temporal coupling seen in frequency conversion experiments using beams with non-zero OAM.…”

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confidence: 99%

Cascaded Generation of Multiply Charged Optical Vortices and Spatiotemporal Helical Beams in a Raman Medium

Gorbach

Skryabin

2007

Phys. Rev. Lett.

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Using an example of a Raman active medium we describe how a common nonlinear process of four-wave mixing can be used to induce strong coupling between the spatial and temporal degrees of freedom in optical waves. This coupling produces several unexpected effects. Amongst those are cascaded excitation of multiply charged optical vortices, spatial focusing in a nonlinearly defocusing medium, and generation of helically shaped spatiotemporal optical solitons.

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Transverse effects in ultrabroadband multifrequency Raman generation

Cited by 14 publications

References 19 publications

Propagation of intense short laser pulses in the atmosphere

Propagation of intense short laser pulses in the atmosphere

Wideband pulse propagation: Single-field and multifield approaches to Raman interactions

Cascaded Generation of Multiply Charged Optical Vortices and Spatiotemporal Helical Beams in a Raman Medium

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