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Igumenshchev IV, Theobald W, Stoeckl C, Shah RC, Bishel DT, Goncharov VN, Bonino MJ, Campbell EM, Ceurvorst L, Chin DA, Collins TJB, Fess S, Harding DR, Sampat S, Shaffer NR, Shvydky A, Smith EA, Trickey WT, Waxer LJ, Colaïtis A, Liotard R, Adrian PJ, Atzeni S, Barbato F, Savino L, Alfonso N, Haid A, Do M. Proof-of-Principle Experiment on the Dynamic Shell Formation for Inertial Confinement Fusion. PHYSICAL REVIEW LETTERS 2023; 131:015102. [PMID: 37478441 DOI: 10.1103/physrevlett.131.015102] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Accepted: 05/25/2023] [Indexed: 07/23/2023]
Abstract
In the dynamic-shell (DS) concept [V. N. Goncharov et al., Novel Hot-Spot Ignition Designs for Inertial Confinement Fusion with Liquid-Deuterium-Tritium Spheres, Phys. Rev. Lett. 125, 065001 (2020).PRLTAO0031-900710.1103/PhysRevLett.125.065001] for laser-driven inertial confinement fusion the deuterium-tritium fuel is initially in the form of a homogeneous liquid inside a wetted-foam spherical shell. This fuel is ignited using a conventional implosion, which is preceded by a initial compression of the fuel followed by its expansion and dynamic formation of a high-density fuel shell with a low-density interior. This Letter reports on a scaled-down, proof-of-principle experiment on the OMEGA laser demonstrating, for the first time, the feasibility of DS formation. A shell is formed by convergent shocks launched by laser pulses at the edge of a plasma sphere, with the plasma itself formed as a result of laser-driven compression and relaxation of a surrogate plastic-foam ball target. Three x-ray diagnostics, namely, 1D spatially resolved self-emission streaked imaging, 2D self-emission framed imaging, and backlighting radiography, have shown good agreement with the predicted evolution of the DS and its stability to low Legendre mode perturbations introduced by laser irradiation and target asymmetries.
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Affiliation(s)
- I V Igumenshchev
- Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623-1212, USA
| | - W Theobald
- Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623-1212, USA
| | - C Stoeckl
- Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623-1212, USA
| | - R C Shah
- Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623-1212, USA
| | - D T Bishel
- Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623-1212, USA
| | - V N Goncharov
- Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623-1212, USA
| | - M J Bonino
- Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623-1212, USA
| | - E M Campbell
- Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623-1212, USA
| | - L Ceurvorst
- Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623-1212, USA
| | - D A Chin
- Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623-1212, USA
| | - T J B Collins
- Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623-1212, USA
| | - S Fess
- Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623-1212, USA
| | - D R Harding
- Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623-1212, USA
| | - S Sampat
- Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623-1212, USA
| | - N R Shaffer
- Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623-1212, USA
| | - A Shvydky
- Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623-1212, USA
| | - E A Smith
- Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623-1212, USA
| | - W T Trickey
- Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623-1212, USA
| | - L J Waxer
- Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623-1212, USA
| | - A Colaïtis
- Centre Lasers Intenses et Applications, UMR 5107, 351 Cours de la libération, 33400 Talence, France
| | - R Liotard
- Centre Lasers Intenses et Applications, UMR 5107, 351 Cours de la libération, 33400 Talence, France
| | - P J Adrian
- Plasma Science and Fusion Center, MIT, Boston, Massachusetts 02139, USA
| | - S Atzeni
- Dipartimento SBAI, Università degli Studi di Roma "La Sapienza,", Via Antonio Scarpa 14, 00161 Roma, Italy
| | - F Barbato
- Dipartimento SBAI, Università degli Studi di Roma "La Sapienza,", Via Antonio Scarpa 14, 00161 Roma, Italy
| | - L Savino
- Dipartimento SBAI, Università degli Studi di Roma "La Sapienza,", Via Antonio Scarpa 14, 00161 Roma, Italy
| | - N Alfonso
- General Atomics, San Diego, California 92816, USA
| | - A Haid
- General Atomics, San Diego, California 92816, USA
| | - Mi Do
- General Atomics, San Diego, California 92816, USA
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Ji L, Zhao X, Liu D, Gao Y, Cui Y, Rao D, Feng W, Li F, Shi H, Liu J, Li X, Xia L, Wang T, Liu J, Du P, Sun X, Ma W, Sui Z, Chen X. High-efficiency second-harmonic generation of low-temporal-coherent light pulse. OPTICS LETTERS 2019; 44:4359-4362. [PMID: 31465402 DOI: 10.1364/ol.44.004359] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Accepted: 08/07/2019] [Indexed: 06/10/2023]
Abstract
The nonlinear frequency conversion of low-temporal-coherent light holds a variety of applications and has attracted considerable interest. However, its physical mechanism remains relatively unexplored, and the conversion efficiency and bandwidth are extremely insufficient. Here, considering the instantaneous broadband characteristics, we establish a model of second-harmonic generation (SHG) of a low-temporal-coherent pulse and reveal its differences from the coherent conditions. It is found that the second-harmonic spectrum distribution is proportional to the self-convolution of that of a fundamental wave. Because of this, we propose a method for realizing low-temporal-coherent SHG with high efficiency and broad bandwidth, and experimentally demonstrate a conversion efficiency up to 70% with a bandwidth of 3.1 THz (2.9 nm centered at 528 nm). To the best of our knowledge, this is the highest efficiency and broadest bandwidth of low-temporal-coherent SHG to date. Our research opens the door for the study of low-coherent nonlinear optical processes.
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Zhang P, Jiang Y, Zhou S, Fan W, Li X. Generation of broadband laser by high-frequency bulk phase modulator with multipass configuration. APPLIED OPTICS 2014; 53:8229-8239. [PMID: 25608064 DOI: 10.1364/ao.53.008229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A new technique is presented for obtaining a large broadband nanosecond-laser pulse. This technique is based on multipass phase modulation of a single-frequency nanosecond-laser pulse from the integrated front-end source, and it is able to shape the temporal profile of the pulse arbitrarily, making this approach attractive for high-energy-density physical experiments in current laser fusion facilities. Two kinds of cavity configuration for multipass modulation are proposed, and the performances of both of them are discussed theoretically in detail for the first time to our knowledge. Simulation results show that the bandwidth of the generated laser pulse by this approach can achieve more than 100 nm in principle if adjustment accuracy of the time interval between contiguous passes is controlled within 0.1% of a microwave period. In our preliminary experiment, a 2 ns laser pulse with 1.35-nm bandwidth in 1053 nm is produced via this technique, which agrees well with the theoretical result. Owing to an all-solid-state structure, the energy of the pulse achieves 25 μJ. In the future, with energy compensation and spectrum filtering, this technique is expected to generate a nanosecond-laser pulse of 3 nm or above bandwidth with energy of about 100 μJ.
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