Self-focusing: Theory

Marburger, John H.

doi:10.1016/0079-6727(75)90003-8

Cited by 969 publications

(294 citation statements)

References 79 publications

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“…In order to study the influence of the mode structure of the incident Bessel-Gaussian beams on their propagation we experimentally investigate filament propagation dynamics in water of intense femtosecond pulses with Bessel-Gaussian beam profiles and different numbers of radial modal lobes under the condition of similar peak intensities, pulse durations, and diameters of the central peak of the beams. The choice of water as a nonlinear medium is dictated by its broad use and the fact that in liquids the Kerr nonlinearity is about three orders of magnitude larger than in gases, 29 therefore the nonlinear effects develop on a shorter distance and require less laser power, which fits well our experimental conditions.…”

Section: Introductionmentioning

confidence: 50%

Extension of filament propagation in water with Bessel-Gaussian beams

Kaya

Sayrac

et al. 2016

AIP Advances

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We experimentally studied intense femtosecond pulse filamentation and propagation in water for Bessel-Gaussian beams with different numbers of radial modal lobes. The transverse modes of the incident Bessel-Gaussian beam were created from a Gaussian beam of a Ti:sapphire laser system by using computer generated hologram techniques. We found that filament propagation length increased with increasing number of lobes under the conditions of the same peak intensity, pulse duration, and the size of the central peak of the incident beam, suggesting that the radial modal lobes may serve as an energy reservoir for the filaments formed by the central intensity peak.

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Section: Introductionmentioning

confidence: 50%

Extension of filament propagation in water with Bessel-Gaussian beams

Kaya

Sayrac

et al. 2016

AIP Advances

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“…For the Gaussian pulse adopted in our experiment, its collapse distance L c can be well estimated by the semiempirical self-focusing formula [27,28] :…”

Section: Resultsmentioning

confidence: 99%

Nitrogen fluorescence induced by the femtosecond intense laser pulses in air

et al. 2016

High Pow Laser Sci Eng

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Our experiments show that external focusing and initial laser energy strongly influences filament generated by the femtosecond Ti-sapphire laser in air. The experimental measurements show the filament length can be extended both by increasing the laser energy and focal length of focusing lens. On the other hand, the plasma fluorescence emission can be enhanced by increasing the laser energy with fixed focal length or decreasing the focal length. In addition, the collapse distance measured experimentally are larger than the calculated ones owing to the group-velocity-dispersion effect. In addition, we find that the line widths of the spectral lines from N 2 is independent of filament positions, laser energies and external focusing.

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“…However, for the first task, heavy numerical calculations are usually required. The reasons are the dynamics of self-focusing and filamentation [85,[127][128][129]. These phenomena always occur alongside ultrashort pulse REVIEW ARTICLE 715 induced modifications, since their threshold intensities are of the same order of magnitude [128,129].…”

Section: Focusing and Feature Sizementioning

confidence: 99%

Femtosecond pulse written fiber gratings: a new avenue to integrated fiber technology

Thomas

Voigtländer

Becker

et al. 2012

Laser & Photonics Reviews

160

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The use of ultrashort laser pulses for fiber grating inscription has many advantages in comparison to continuous wave and long pulse lasers. The most important one is that it allows inscription in nonphotosensitive fiber materials. In this paper the principal inscription techniques and the physical properties of femtosecond (fs) pulse written in-fiber gratings are reviewed. The role of focusing and order walk-off on the inscribed structures is emphasized. A fs pulse written fiber Bragg grating (FBG) also has a unique coupling behavior, due to a refractive index change that is independent from the fiber geometry. Selected applications of such gratings for sensing and fiber lasers are discussed.

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Self-focusing: Theory

Cited by 969 publications

References 79 publications

Extension of filament propagation in water with Bessel-Gaussian beams

Extension of filament propagation in water with Bessel-Gaussian beams

Nitrogen fluorescence induced by the femtosecond intense laser pulses in air

Femtosecond pulse written fiber gratings: a new avenue to integrated fiber technology

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