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Title: High Laser Beam Energy and Fluence Produced with a Plasma Beam Combiner at NIF

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1366946
Report Number(s):
LLNL-PROC-730382
DOE Contract Number:
AC52-07NA27344
Resource Type:
Conference
Resource Relation:
Conference: Presented at: Anomalous Absorption Conference, Florence, OR, United States, Jun 11 - Jun 16, 2017
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 70 PLASMA PHYSICS AND FUSION

Citation Formats

Kirkwood, R K, Turnbull, D P, Chapman, T, Wilks, S C, Rosen, M D, London, R A, Pickworth, L A, Dunlop, W H, Moody, J D, Berger, R L, Strozzi, D J, Michel, P A, Divol, L, Landen, O L, MacGowan, B J, Fournier, K B, and Blue, B. High Laser Beam Energy and Fluence Produced with a Plasma Beam Combiner at NIF. United States: N. p., 2017. Web.
Kirkwood, R K, Turnbull, D P, Chapman, T, Wilks, S C, Rosen, M D, London, R A, Pickworth, L A, Dunlop, W H, Moody, J D, Berger, R L, Strozzi, D J, Michel, P A, Divol, L, Landen, O L, MacGowan, B J, Fournier, K B, & Blue, B. High Laser Beam Energy and Fluence Produced with a Plasma Beam Combiner at NIF. United States.
Kirkwood, R K, Turnbull, D P, Chapman, T, Wilks, S C, Rosen, M D, London, R A, Pickworth, L A, Dunlop, W H, Moody, J D, Berger, R L, Strozzi, D J, Michel, P A, Divol, L, Landen, O L, MacGowan, B J, Fournier, K B, and Blue, B. Fri . "High Laser Beam Energy and Fluence Produced with a Plasma Beam Combiner at NIF". United States. doi:. https://www.osti.gov/servlets/purl/1366946.
@article{osti_1366946,
title = {High Laser Beam Energy and Fluence Produced with a Plasma Beam Combiner at NIF},
author = {Kirkwood, R K and Turnbull, D P and Chapman, T and Wilks, S C and Rosen, M D and London, R A and Pickworth, L A and Dunlop, W H and Moody, J D and Berger, R L and Strozzi, D J and Michel, P A and Divol, L and Landen, O L and MacGowan, B J and Fournier, K B and Blue, B},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Apr 21 00:00:00 EDT 2017},
month = {Fri Apr 21 00:00:00 EDT 2017}
}

Conference:
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  • Extreme optical fluences, much beyond the damage threshold of conventional optics, are of interest for a range of high-energy-density physics applications. Nonlinear interactions of multiple beams in plasmas have the potential to produce optics that operate at much higher intensity and fluence than is possible in solids. In inertial confinement fusion experiments indirectly driven with lasers, many beams overlap in the plasma inside a hohlraum, and cross-beam energy transfer by Brillouin scattering has been employed to redistribute energy between laser beams within the target. Here in this paper, we show that in a hot, under-dense plasma the energy of manymore » input beams can be combined into a single well-collimated beam. The emerging beam has an energy of 4 kJ (over 1 ns) that is more than triple that of any incident beam, and a fluence that is more than double. Because the optic produced is plasma, and is diffractive, it is inherently capable of generating higher fluences in a single beam than solid-state refractive or reflective optics.« less
  • Customized spatial light modulators have been designed and fabricated for use as precision beam shaping devices in fusion class laser systems. By inserting this device in a low-fluence relay plane upstream of the amplifier chain, 'blocker' obscurations can be programmed into the beam profile to shadow small isolated flaws on downstream optical components that might otherwise limit the system operating energy. In this two stage system, 1920 x 1080 bitmap images are first imprinted on incoherent, 470 nm address beams via pixilated liquid crystal on silicon (LCoS) modulators. To realize defined masking functions with smooth apodized shapes and no pixelizationmore » artifacts, address beam images are projected onto custom fabricated optically-addressable light valves. Each valve consists of a large, single pixel liquid cell in series with a photoconductive Bismuth silicon Oxide (BSO) crystal. The BSO crystal enables bright and dark regions of the address image to locally control the voltage supplied to the liquid crystal layer which in turn modulates the amplitude of the coherent beams at 1053 nm. Valves as large as 24 mm x 36 mm have been fabricated with low wavefront distortion (<0.5 waves) and antireflection coatings for high transmission (>90%) and etalon suppression to avoid spectral and temporal ripple. This device in combination with a flaw inspection system and optic registration strategy represents a new approach for extending the operational lifetime of high fluence laser optics.« less