Grating-based broadband third-harmonic generation and focusing system for the Laser Megajoule

Boscheron, A.; Journot, Eric; Dulac, A.; Adolf, Alain

doi:10.1109/cleo.1998.676269

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Calculations Of Velocities and Hot Spot Lifetime1

A Principles1

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1999

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“…given by Eq. (17). We find that the transverse velocities v x and v y are always null, and the expression of the longitudinal velocity…”

Section: Calculations Of Velocities and Hot Spot Lifetimementioning

confidence: 72%

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Motion of hot spots in smoothed beams

1999

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We develop a statistical model that describes the motion of a hot spot created by smoothing techniques. We define clearly the transverse and longitudinal instantaneous velocities of a hot spot and quantify its lifetime. This relevant parameter is found to be longer than the laser coherence time defined as the inverse of the spectrum bandwidth. We apply this model to the most usual smoothing techniques, using a sinusoidal phase modulation or a random spectrum. We give asymptotic results for hot spot velocities and lifetime for the cases of one-dimensional smoothing by spectral dispersion, smoothing by longitudinal spectral dispersion, and smoothing by optical fiber.

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“…given by Eq. (17). We find that the transverse velocities v x and v y are always null, and the expression of the longitudinal velocity…”

Section: Calculations Of Velocities and Hot Spot Lifetimementioning

confidence: 72%

“…The grating is tailored so that more than 90% of the energy is focused in the central spot. 17 The grating is then equivalent to a chromatic lens, and its transmission function 19,20 T is in the paraxial approximation:…”

Section: A Principlesmentioning

confidence: 99%