Increased damage thresholds due to laser pulse modulation

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Nonlinear self-focusing in laser glass imposes limits on the energy fluence that can be safely transmitted without risking damage. For this reason, it is desirable to strictly limit the peak to average spatial variations of fluence by smoothing schemes such as Smoothing by Spectral Dispersion (SSD). While spatial variations are problematic, the same is not necessarily true of temporal variations since normal group velocity dispersion tends to smooth out temporal peaks caused by spatial self-focusing. Earlier work indicated that increased bandwidth can delay the onset of self focusing. The present work re-examines the question of self focusing threshold increases due ... continued below

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8 p.

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Feit, M.D.; Musher, S.L.; Shapiro, E.G. & Rubenchik, A.M. May 30, 1995.

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  • Feit, M.D. Lawrence Livermore National Lab., Livermore, CA (United States)
  • Musher, S.L.
  • Shapiro, E.G. Inst. of Automation and Electrometry, Novosibirsk (Russian Federation)
  • Rubenchik, A.M. Inst. of Automation and Electrometry, Novosibirsk (Russian Federation)

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Description

Nonlinear self-focusing in laser glass imposes limits on the energy fluence that can be safely transmitted without risking damage. For this reason, it is desirable to strictly limit the peak to average spatial variations of fluence by smoothing schemes such as Smoothing by Spectral Dispersion (SSD). While spatial variations are problematic, the same is not necessarily true of temporal variations since normal group velocity dispersion tends to smooth out temporal peaks caused by spatial self-focusing. Earlier work indicated that increased bandwidth can delay the onset of self focusing. The present work re-examines the question of self focusing threshold increases due to high bandwidth by investigating another source of such increase in three dimensional beam breakup--the bending instability. For simplicity, the authors consider the behavior of a single space-time speckle. Normal dispersion can lead to splitting of the pulse and delay of self focusing for short enough pulses as noted above. In addition to the self focusing instability, the laser beam is also subject to the so-called bending (sausage like) instability which can spatially disperse the field maxima over time. Because the bending instability breaks an initial axial symmetry, a full three dimensional numerical simulation is required to study it accurately. Such calculations are possible, but costly. The authors have used a modified 2D nonlinear Schroedinger equation with a high power nonlinearity since this mimics the 3D behavior of the competition between self focusing and bending. This study is relevant for inertial confinement conditions.

Physical Description

8 p.

Notes

INIS; OSTI as DE95016607

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  • 1. annual solid-state lasers for application to inertial confinement fusion meeting, Monterey, CA (United States), 30 May - 2 Jun 1995

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  • Other: DE95016607
  • Report No.: UCRL-JC--121285
  • Report No.: CONF-9505264--5
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/102207 | External Link
  • Office of Scientific & Technical Information Report Number: 102207
  • Archival Resource Key: ark:/67531/metadc625805

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  • May 30, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • Feb. 16, 2016, 8:02 p.m.

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Feit, M.D.; Musher, S.L.; Shapiro, E.G. & Rubenchik, A.M. Increased damage thresholds due to laser pulse modulation, report, May 30, 1995; California. (digital.library.unt.edu/ark:/67531/metadc625805/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.