Journal ArticleDOI
Precision spectral sculpting for narrow-band amplification of broadband frequency-modulated pulses.
Leon J. Waxer,John H. Kelly,Joshua E. Rothenberg,A. Babushkin,Camille Bibeau,Andy J. Bayramian,S.A. Payne +6 more
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TLDR
Sculpting for centerline small-signal gains of 10(4) is demonstrated, producing amplified pulses that have both sufficient bandwidths for on-target beam smoothing and temporal profiles that have no potentially damaging AM.Abstract:
Amplification of broadband frequency-modulated (FM) pulses in high-efficiency materials such as ytterbium-doped strontium fluorapatite results in significant gain narrowing, leading to reduced on-target bandwidths for beam smoothing and to conversion from frequency modulation to amplitude modulation (AM). To compensate for these effects, we have applied precision spectral sculpting, requiring both amplitude and phase shaping, to the amplification of broadband FM pulses in narrow-band gain media. We have demonstrated sculpting for centerline small-signal gains of 104, producing amplified pulses that have both sufficient bandwidths for on-target beam smoothing and temporal profiles that have no potentially damaging AM.read more
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Journal ArticleDOI
The mercury project: a high average power, gas-cooled laser for inertial fusion energy development
Andy J. Bayramian,P. Armstrong,E. Ault,Raymond J. Beach,Camille Bibeau,John A. Caird,R. Campbell,B. Chai,Jay W. Dawson,Christopher A. Ebbers,Alvin C. Erlandson,Y. Fei,Barry L. Freitas,R. Kent,Z. Liao,T. Ladran,Joseph A. Menapace,B. Molander,S.A. Payne,N. Peterson,M. Randles,Kathleen I. Schaffers,S.B. Sutton,J. Tassano,S. Telford,E. Utterback +25 more
TL;DR: The Mercury laser project as discussed by the authors developed key technologies within an architectural framework that demonstrates basic building blocks for scaling to larger multi-kilojoule systems for inertial fusion energy (IFE) applications.
Journal ArticleDOI
Fusion energy with lasers, direct drive targets, and dry wall chambers
John D. Sethian,Moshe Friedman,Robert Lehmberg,M.C. Myers,S. P. Obenschain,John Giuliani,P. Kepple,Andrew J. Schmitt,Denis Colombant,John H. Gardner,Frank Hegeler,Matthew Wolford,S.B. Swanekamp,D. Weidenheimer,Dale Welch,D. V. Rose,S.A. Payne,Camille Bibeau,A. Baraymian,Raymond J. Beach,Kathleen I. Schaffers,Barry L. Freitas,K. Skulina,Wayne R. Meier,J F Latkowski,L.J. Perkins,D.T. Goodin,R.W. Petzoldt,Elizabeth H. Stephens,Farrokh Najmabadi,Mark S. Tillack,R. Raffray,Zoran Dragojlovic,D. Haynes,Robert R. Peterson,Gerald L. Kulcinski,James K. Hoffer,D. Geller,Diana Grace Schroen,J. Streit,Craig L. Olson,T.J. Tanaka,Timothy J. Renk,Gregory Rochau,Lance Lewis Snead,N. Ghoneim,G. Lucas +46 more
TL;DR: In this article, a low-density CH foam that is wicked with solid DT and over-coated with a thin high-Z layer is used to achieve repetitive first light.
Journal ArticleDOI
Laser Challenges for Fast Ignition
Jonathan D. Zuegel,S. Borneis,Christopher P. J. Barty,B. Legarrec,C. Danson,N. Miyanaga,P. K. Rambo,C. Leblanc,Terrance J. Kessler,Ansgar W. Schmid,Leon J. Waxer,John H. Kelly,B. E. Kruschwitz,R. Jungquist,Edward I. Moses,J.A. Britten,Igor Jovanovic,Jay W. Dawson,N. Blanchot +18 more
TL;DR: The laser challenges and state of the art in high-energy, solid-state petawatt lasers for fast ignition (FI) research are reviewed in this paper, where a number of new laser systems are currently under construction or being planned that will facilitate proof of principle FI experiments.
Journal ArticleDOI
Compensation of frequency modulation to amplitude modulation conversion in frequency conversion systems
TL;DR: It is shown that most of AM distortion can be reduced by practical systems: for beam intensity up to 3 GW/cm(2), the FM-to-AM conversion level can be divided by at least 2, and the intensity modulation level can almost cancel intensity modulation for intensities below 1 GW/ cm(2).
Journal ArticleDOI
Progress of the injection laser system of SG-II
Wei Fan,Youen Jiang,Jiangfeng Wang,Xiaochao Wang,Dajie Huang,Xinghua Lu,Hui Wei,Guoyang Li,Xue Pan,Zhi Qiao,Chao Wang,He Cheng,Peng Zhang,Wenfa Huang,Zhuli Xiao,Shengjia Zhang,Xuechun Li,Jianqiang Zhu,Zunqi Lin +18 more
TL;DR: In this article, the key technological progress involved in the improvement of the performance of the injection laser of SG-II is reported, including frequency domain control and time domain control, near field spatial shaping, pre-amplifier technology, and the optical parametric chirped pulse amplification pump source.
References
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Journal ArticleDOI
Femtosecond pulse shaping using spatial light modulators
TL;DR: In this article, the field of femtosecond pulse shaping is reviewed, and applications of pulse shaping to optical communications, biomedical optical imaging, high power laser amplifiers, quantum control, and laser-electron beam interactions are reviewed.
Journal ArticleDOI
Improved laser‐beam uniformity using the angular dispersion of frequency‐modulated light
TL;DR: In this paper, the beam is broken up into beamlets, using a phase plate, such that the beamlet diffraction-limited focal spot is the size of the target.
Journal ArticleDOI
High-resolution femtosecond pulse shaping
Andrew M. Weiner,E. M. Kirschner +1 more
TL;DR: In this article, the synthesis of arbitrarily shaped femtosecond pulses by spectral filtering in a temporally nondispersive grating apparatus is demonstrated by utilizing spatially patterned masks to modify the amplitude and the phase of the optical frequency components that are spatially dispersed within the apparatus.
Journal ArticleDOI
Amplitude and phase control of ultrashort pulses by use of an acousto-optic programmable dispersive filter: pulse compression and shaping.
TL;DR: It is demonstrated experimentally that an arbitrary phase and amplitude profile can be applied to an ultrashort pulse by use of an acousto-optic programmable dispersive filter (AOPDF) that has a large group-delay range and a 30% diffraction efficiency over 150 THz.
Journal ArticleDOI
Generation of high-fidelity programmable ultrafast optical waveforms.
Marc M. Wefers,Keith A. Nelson +1 more
TL;DR: Two liquid-crystal spatial light modulators are employed in a novel arrangement to permit the generation of programmable ultrashort waveforms with exceptional versatility and fidelity and the time-dependent polarization profile is controlled.