Harmonic Generation and Parametric Excitation of Waves in a Laser-Created Plasma

Bobin, J. L.; Decroisette, M.; Meyer, Bernard De; Vitel, Y.

doi:10.1103/physrevlett.30.594

Cited by 148 publications

(24 citation statements)

References 13 publications

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“…It is well known that this emission is related to the 2co p decay instability at fl c /4. 17 ' 18 The close correlation between the two sets of data clearly supports the view that these two experimental signatures have a common origin in the 2u> p decay instability. Moreover, the threshold intensity of -^2xl0 14 W cm" 2 is in good agreement with that predicted 18 for the 2co p decay instability for typical coronal plasma conditions (T e == 1 keV, and density scale length L == 50 /xm).…”

mentioning

confidence: 63%

Absorption Physics at 351 nm in Spherical Geometry

et al. 1985

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Absorption and energy partitioning have been measured for spherical targets irradiated on the OMEGA facility by six beams of nanosecond 351-nm laser radiation at intensities from 10 13 to 10 15 W cm -2 . Efficient collisional absorption is found, in agreement with one-dimensional simulations including refraction and inhibited transport, and very low levels ( ~ 10 ~4) of superthermal electron production are demonstrated.

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mentioning

confidence: 63%

Absorption Physics at 351 nm in Spherical Geometry

et al. 1985

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“…Early observations of harmonic and subharmonic emission were reported by Bobin et al 414 in Nd:glass laser-solid target experiments at a 1-lm wavelength. 415 again employing a Nd:glass laser at a 1-lm wavelength, determined the threshold laser intensity for the onset of 3x 0 =2 emission and found it to be consistent with the threshold for the excitation of the TPD instability as given by Jackson 403 and Rosenbluth.…”

Section: Single-beam Experimentsmentioning

confidence: 86%

“…Not until the 1970s, however, did lasers become powerful enough to allow experimental observation of SRS. Bobin et al 414 observed down-scattered light at x 0 =2 using a Nd:glass laser and a solid hydrogen target ( Fig. 10-2), although it was unclear whether this was actually SRS.…”

Section: Stimulated Raman Scattering (Srs)mentioning

confidence: 99%

Direct-drive inertial confinement fusion: A review

et al. 2015

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The direct-drive, laser-based approach to inertial confinement fusion (ICF) is reviewed from its inception following the demonstration of the first laser to its implementation on the present generation of high-power lasers. The review focuses on the evolution of scientific understanding gained from target-physics experiments in many areas, identifying problems that were demonstrated and the solutions implemented. The review starts with the basic understanding of laser–plasma interactions that was obtained before the declassification of laser-induced compression in the early 1970s and continues with the compression experiments using infrared lasers in the late 1970s that produced thermonuclear neutrons. The problem of suprathermal electrons and the target preheat that they caused, associated with the infrared laser wavelength, led to lasers being built after 1980 to operate at shorter wavelengths, especially 0.35 μm—the third harmonic of the Nd:glass laser—and 0.248 μm (the KrF gas laser). The main physics areas relevant to direct drive are reviewed. The primary absorption mechanism at short wavelengths is classical inverse bremsstrahlung. Nonuniformities imprinted on the target by laser irradiation have been addressed by the development of a number of beam-smoothing techniques and imprint-mitigation strategies. The effects of hydrodynamic instabilities are mitigated by a combination of imprint reduction and target designs that minimize the instability growth rates. Several coronal plasma physics processes are reviewed. The two-plasmon–decay instability, stimulated Brillouin scattering (together with cross-beam energy transfer), and (possibly) stimulated Raman scattering are identified as potential concerns, placing constraints on the laser intensities used in target designs, while other processes (self-focusing and filamentation, the parametric decay instability, and magnetic fields), once considered important, are now of lesser concern for mainline direct-drive target concepts. Filamentation is largely suppressed by beam smoothing. Thermal transport modeling, important to the interpretation of experiments and to target design, has been found to be nonlocal in nature. Advances in shock timing and equation-of-state measurements relevant to direct-drive ICF are reported. Room-temperature implosions have provided an increased understanding of the importance of stability and uniformity. The evolution of cryogenic implosion capabilities, leading to an extensive series carried out on the 60-beam OMEGA laser [Boehly et al., Opt. Commun. 133, 495 (1997)], is reviewed together with major advances in cryogenic target formation. A polar-drive concept has been developed that will enable direct-drive–ignition experiments to be performed on the National Ignition Facility [Haynam et al., Appl. Opt. 46(16), 3276 (2007)]. The advantages offered by the alternative approaches of fast ignition and shock ignition and the issues associated with these concepts are described. The lessons learned from target-physics and implosion experiments are taken into account in ignition and high-gain target designs for laser wavelengths of 1/3 μm and 1/4 μm. Substantial advances in direct-drive inertial fusion reactor concepts are reviewed. Overall, the progress in scientific understanding over the past five decades has been enormous, to the point that inertial fusion energy using direct drive shows significant promise as a future environmentally attractive energy source.

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“…Second-harmonic (2ω) and three-halved harmonic (3ω/2) emissions from a laserproduced plasma on various surfaces have been experimentally studied by many authors since the first observation by Bobin et al [18]. These phenomena are interesting from the viewpoint of nonlinear optics.…”

Section: Generation Of Backscattered 2ω and 3ω/2 Harmonics Of Femtosementioning

confidence: 98%

X-ray Lasers, Plasma Properties and Harmonic Generation from Surfaces

Ganeev

2013

Laser - Surface Interactions

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In this chapter, the basic principles of surface-excited X-ray lasers are discussed. We demonstrate the achievements reported during studies of two laser systems, 13 nm Ag X-ray laser and 18.9 nm Mo X-ray laser. We show the methods for analysis of the plasma properties at strong laser-surface interactions. We demonstrate how laser plasmas generated by femtosecond radiation on the surface of boron and molybdenum targets are investigated by the shadowgraph method. The occurrence of plasma bullets is discussed, which were observed on both singlepulse and multi-pulse interaction with the same area of a target. Backscattered 2ω and 3ω/2 harmonics generation during the interaction of femtosecond radiation with the surfaces of various targets is analyzed. The efficient second and threehalved harmonics were achieved for low-Z targets, whereas only second-harmonic generation was observed for high-Z materials. Finally, we consider various peculiarities of harmonic generation from the surface interfaces during interaction with ultra-strong laser fields.Keywords X-ray lasers · Plasma for X-ray lasers · Harmonic generation from surfaces · 18.9 nm laser · Molybdenum laser · Surface plasma · High excitation shadowgraphs · Backscattered 2ω and 3ω/2 harmonics · Low-order harmonic generation · Laser chirp

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Harmonic Generation and Parametric Excitation of Waves in a Laser-Created Plasma

Cited by 148 publications

References 13 publications

Absorption Physics at 351 nm in Spherical Geometry

Absorption Physics at 351 nm in Spherical Geometry

Direct-drive inertial confinement fusion: A review

X-ray Lasers, Plasma Properties and Harmonic Generation from Surfaces

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