Laser-beam propagation in a long solenoid

Mani, S. A.; Eninger, J.E.; Wallace, James

doi:10.1088/0029-5515/15/3/002

Cited by 19 publications

(5 citation statements)

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“…The profile is characteristic of a strong shock wave [15] with an axial density minimum increasing to a sharp maximum at the channel walls. This represents a refractive index profile that is capable of confining an intense laser [5][6][7][8]. A simple but instructive estimate of the largest ray angle confined by the uniform part of the channel can be obtained from Snell's law applied to the density profile.…”

Section: Interaction Of Intense Laser Pulses With Preformed Density Cmentioning

confidence: 99%

“…At extremely high laser irradiance ͑.10 18 W cm 22 ͒ self channeling due to relativistic and ponderomotive effects can greatly enhance the propagation length [4]. However, the interaction length can still be increased for applications requiring lower laser irradiance by focusing a low energy prepulse to form a plasma waveguide or channel [5][6][7][8]. To date most experiments using this scheme have been carried out at low densities where the length of the guiding channel is limited by the depth of focus of the preforming laser.…”

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Interaction of Intense Laser Pulses with Preformed Density Channels

et al. 1998

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The interaction of a high-intensity laser pulse with a plasma density channel preformed in a gas jet target has been studied. At neutral densities below 3.0 3 10 19 cm 23 a strong interaction between the pulse and the channel walls was observed, there was clear evidence of pulse confinement, and the laser irradiance was significantly increased compared to an interaction with neutral gas. At higher gas densities, however, the radial uniformity and length of the channel were both found to be adversely affected by refractive defocusing of the prepulse used to generate the channel.[S0031-9007(98)06338-8] PACS numbers: 52.40.Nk, 52.35.Tc, 52.50.Jm The propagation of intense laser pulses through preformed plasmas is an important area of study for many topical applications of laser produced plasmas, such as the laser particle accelerator [1], x-ray lasers [2], high harmonic generation, and the fast ignitor scheme [3]. These applications generally require an ultrashort high power laser pulse to interact with a neutral gas or plasma at high density (with n e . 0.01n c where n e and n c are the electron and critical density, respectively) and high irradiance ͑10 14 10 19 W cm 22 ͒ over distances ranging from a few mm to several cm. At extremely high laser irradiance ͑.10 18 W cm 22 ͒ self channeling due to relativistic and ponderomotive effects can greatly enhance the propagation length [4]. However, the interaction length can still be increased for applications requiring lower laser irradiance by focusing a low energy prepulse to form a plasma waveguide or channel [5][6][7][8]. To date most experiments using this scheme have been carried out at low densities where the length of the guiding channel is limited by the depth of focus of the preforming laser. In fact, guiding over 203 the diffraction limited focal depth has been observed by using an axicon to maximize the length of the plasma channel [6]. Applying this result to higher plasma densities is problematic for short (1-10 ps) prepulses because as the density increases the length of the channel will be limited by ionization defocusing of the preforming pulse [9,10] not diffraction. There is presently little or no information on the effect of ionization defocusing on the formation of preformed density channels using short prepulses. In addition there are very few direct measurements of how the second pulse interacts with and modifies the channel.This Letter describes the first experimental studies of the interaction of intense laser pulses with plasma channels in the strongly refractive density regime where ionization defocusing influences both the formation of the channel itself and the subsequent propagation of intense pulses through it. In these experiments a 1 mm, 3 ps, laser pulse was focused onto the edge of a neon gas jet with atomic density .1 3 10 19 cm 23 at a vacuum intensity of 1 3 10 18 W cm 22 . Quantitative measurements of the electron density profiles produced by focusing the laser pulse either into the neutral gas or preformed density channel were ...

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Section: Interaction Of Intense Laser Pulses With Preformed Density Cmentioning

confidence: 99%

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confidence: 99%

Interaction of Intense Laser Pulses with Preformed Density Channels

et al. 1998

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“…A periodic focusing-defocusing of the beam as it propagates along the column has been predicted [28] however. If this periodicity coincides with the length of axial density perturbations then this can lead to unstable growth of the laser beam radius [29].…”

Section: Laser Beam Self-focusing Filamentation and Stabilitymentioning

confidence: 99%

“…Mani et al [28] carried out a normal mode analysis of beam propagation in a plasma with a preformed parabolic radial density profile. They calculate the axial distance which the normal modes can propagate before tunnelling through the refractive barrier and find that all modes in finite plasmas can easily propagate distances of the order of 1 km.…”

Section: Laser Beam Propagationmentioning

confidence: 99%

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Laser heating of magnetized plasmas

Kristiansen¹,

Hagler²

1976

Nucl. Fusion

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Current research on long-wavelength laser interaction with magnetized plasmas is summarized. Special attention is given to laser beam guiding in plasma density minima, to plasma heating and to investigations of laser-produced plasmas in strong magnetic fields. The basic theoretical and experimental background aad research are discussed. Reactor studies based on lassr heated plasma systems are reviewed. Some areas of possible future research are mentioned.

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Multiparabolic approximation for ray tracing in linear plasma columns

McMullin

Capjack

1987

Computer Physics Communications

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Laser-beam propagation in a long solenoid

Cited by 19 publications

References 6 publications

Interaction of Intense Laser Pulses with Preformed Density Channels

Interaction of Intense Laser Pulses with Preformed Density Channels

Laser heating of magnetized plasmas

Multiparabolic approximation for ray tracing in linear plasma columns

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