laser intensity self-focusing glass

Laser Beam Self-Focusing in Optical Fiber controlled through ...- laser intensity self-focusing glass ,A laser beam with a Gaussian shape is let to propagate through the core of the fiber with an intensity-dependent refractive index. In the center of the fiber, the refractive index will reach the highest value, focusing the beam. This property of the Gaussian beam to a specific intensity induces positive focusing is called self-focusing. Transverse and axial resolution of femtosecond laser ablationAn intensity above the absorption threshold produces strong nonlinear absorption, and energy transfers into the material . Together with the parameters for laser focusing, the ablation threshold sets a focal volume where the laser pulses can vaporize material and create damage.



Small-scale self-focusing effects in a high power glass laser ...

The U.S. Department of Energy' Office of Scientific and Technical Information

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Blast-wave diagnosis of self-focusing of an intense laser ...

As illustrated by Alexeev et al., this is an indication of interaction changes within the high intensity channel. If the self-focusing of the laser pulse.9 Because the beam diameter fraction of incident laser energy coupled into thermal energy becomes very small, the chord-integrated electron density is were to remain the same for each ...

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Self-Focusing Suppression in Ultrahigh-Intensity Lasers

We experimentally confirmed that free space run acts as a spatial filter and drastically suppresses small-scale self-focusing in laser beam with intensity order of TW/cm2. The measurements were done by two independent techniques.

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Relativistic self-focusing in the interaction of laser beam ...

Introduction. Self-focusing generally refers to a nonlinear phenomenon which is caused by the incident high-intensity laser under the action of an electric field, as the intensity of the light increases, and the refractive index of the plasma increases at the same time, thus causing the outer profile of the laser beam to deflect toward the center.

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Laser Pulse Filamentation - Stanford University

Shortly after the development of the ruby laser, scientists theorized about the self focusing of optical pulses under certain conditions. [2] Experimental evidence was provided in 1964 when a beam focused into glass produced a 1 cm track of permanent damage.

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Laser Filamentation - Beyond Self-focusing and Plasma Defocusing

Figure 1: Picture of a laser filament in the laboratory, taken with a standard DSLR camera. 1 Figure 2: Diagrams illustrating the basic principle behind (a) Kerr effect and self-focusing and (b) plasma defocusing. The first diagram in each set depicts the change in

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Ultra-high intensity lasers as tools for novel physics

Ultra-high intensity lasers can provide excellent tools for investigating novel physical phenomena due to extreme laser fields. The intensity of an ultra-high intensity laser exceeded 1023 W/cm2, and with this unprecedented intensity, the exploration of strong-field physics and laboratory astrophysics can be pursued. In this paper, we review the fundamentals and progress of chirped pulse ...

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A review on self focusing in laser plasma ... - ScienceDirect

Optical Kerr-effect is responsible for self focusing in media when an intense laser radiation interact with media and that cause variation in the refractive index Ƞ as given by following equation, η = η 0 + η 2 ( I) Where η 0 and η 2 are the linear and non-linear parts of the refractive index and I is the intensity of the laser.

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Filament propagation - Wikipedia

In nonlinear optics, filament propagation is propagation of a beam of light through a medium without diffraction. This is possible because the Kerr effect causes an index of refraction change in the medium, resulting in self-focusing of the beam. Filamentary damage tracks in glass caused by laser pulses were first observed by Michael Hercher in ...

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Tunable nonlinear optical properties in magnetic ...

In this paper, the intensity-dependent nonlinear optical absorption and nonlinear refraction behaviors of the Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles suspension exposed to the 1064 nm picosecond laser pulses (25 ps) were investigated by applying the Z-scan technique. A new type of saturation absorption curve of the magnetic fluids was obtained at lower excitation power levels. As the ...

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Laser Filamentation - Beyond Self-focusing and Plasma Defocusing

Figure 1: Picture of a laser filament in the laboratory, taken with a standard DSLR camera. 1 Figure 2: Diagrams illustrating the basic principle behind (a) Kerr effect and self-focusing and (b) plasma defocusing. The first diagram in each set depicts the change in

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Self-Focusing Suppression in Ultrahigh-Intensity Lasers

Download Citation | Self-Focusing Suppression in Ultrahigh-Intensity Lasers | We experimentally confirmed that free space run acts as a spatial filter and drastically suppresses small-scale self ...

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Self-focusing - Wikipedia

Self-focusing can be induced by a permanent refractive index change resulting from a multi-pulse exposure. This effect has been observed in glasses which increase the refractive index during an exposure to ultraviolet laser radiation. Accumulated self-focusing develops as a wave guiding, rather than a lensing effect.

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non linear optics - Self-focusing of laser beam - Physics ...

If a short laser pulse has equal or more power than so called critical focusing power, sooner or later beam will self-focus, but the distance of beam travel, until it self-focuses, can be very huge, and this distance is strongly beam size dependent. If we expand our beam waist radius w 0, the so called non-linear focal length z n f increases:

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Visible laser self-focusing in hybrid glass planar waveguides.

1. Opt Lett. 2002 Aug 1;27(15):1342-4. Visible laser self-focusing in hybrid glass planar waveguides. Saravanamuttu K, Andrews MP. We report that self-focusing occurs with simultaneous self-inscription of a cylindrical waveguide when 514.5-nm light from a cw argon-ion laser propagates i

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Self-Focusing of Gaussian Laser Beam in an Axially Magnetized ...

In the present theoretical investigation, the phenomenon of relativistic self-focusing of finite Airy-Gaussian (AiG) laser beams in cold quantum plasma has been explored under standard Wentzel ...

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Visible laser self-focusing in hybrid glass planar waveguides.

1. Opt Lett. 2002 Aug 1;27(15):1342-4. Visible laser self-focusing in hybrid glass planar waveguides. Saravanamuttu K, Andrews MP. We report that self-focusing occurs with simultaneous self-inscription of a cylindrical waveguide when 514.5-nm light from a cw argon-ion laser propagates i

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Enhanced laser intensity and ion acceleration due to self ...

View presentations details for Enhanced laser intensity and ion acceleration due to self-focusing in expanding ultrathin foils at SPIE Optics + Optoelectronics

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Self-focusing, explained by RP Photonics Encyclopedia; limit ...

Due to a Kerr lens, an intense light pulse propagating in a nonlinear medium can experience nonlinear self-focusing (or self-focussing): the beam radius is decreased compared with that of a weak pulse. The physical mechanism is based on a Kerr nonlinearity with positive χ(3) .

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Energy shedding during nonlinear self-focusing of laser pulses

With the development of lasers, self-trapping and self-focusing of intense light due to the intensity-dependent change in the refractive index of certain media was predicted [1]. For a medium with a sufficiently large, negative Kerr coefficient (n <inf >2 </inf >), self-focusing of the incident light takes place when the power exceeds a critical value [2]. For cw and short pulse ...

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A simple technique to overcome self-focusing, filamentation ...

The Dual-Beam laser processing scheme: (a) focusing two parallel laser beams formed with a spatially filtered Gaussian beam, using two holes in a metal plate.(b) The Dual-Beam (DB) method tightens ...

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Self-Focusing of Gaussian Laser Beam in an Axially Magnetized ...

In the present theoretical investigation, the phenomenon of relativistic self-focusing of finite Airy-Gaussian (AiG) laser beams in cold quantum plasma has been explored under standard Wentzel ...

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From self-focusing light beams to femtosecond laser pulse ...

Abstract. 2012 marked the 50th anniversary of the first published prediction of the self-focusing phenomenon in light beams. The recent revived interest in the subject is due to advances in high-power femtosecond laser technology and due to the possibility they provided of creating extended filaments of high light field intensity in gases and ...

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Small-scale self-focusing effects in a high power glass laser ...

The U.S. Department of Energy' Office of Scientific and Technical Information

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