Spatiotemporal smoothing of a laser beam employing a dynamic plasma phase plate

Voronich, I. N.; Гаранин, С. Г.; Деркач, В. Н.; Zaretskii, A. I.; Kravchenko, A. G.; Лебедев, В. А.; Pinegin, A. V.; Sosipatrov, A V; Sukharev, S. A.

doi:10.1070/qe2001v031n11abeh002085

Cited by 12 publications

(6 citation statements)

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“…The maximum laser transmission was approximately 60% for the 100 µm-thick layer of the foam with density 2.25 mg/cm 3 . Relatively high energy losses are related to short (≈ 320 ps FWHM) laser pulses, losses may be acceptable for typical laser pulses of a few ns duration.…”

Section: Laser Transmission Through Underdense Foamsmentioning

confidence: 99%

“…Also ignition hohlraums may be filled with a low-density foam [2]. Alternatively, transparent underdense foam layer may serve as a dynamic phase plate in order to randomize and partly wash out inhomogeneity patterns inside a laser beam [3]. Foam layers may also be utilized for ion acceleration by relativistic femtosecond laser pulses [4].…”

Section: Introductionmentioning

confidence: 99%

“…electron density n eh in the fully ionized homogenized foam is less than the laser critical density n c ) are presented. Aerogel 3D networks of cellulose triacetate (TAC -C 12 H 16 O 8 ) with a typical pore size in the range of 0.5-3 µm [7] were used in this study that can both enlighten laser-foam interaction physics, and also investigate the inevitable loss of laser energy when foam is applied as a dynamic random phase plate for laser beam smoothing [3].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Applications of low-density foams for x-ray source studies and laser beam smoothing

Limpouch

Renner

Борисенко

et al. 2008

J. Phys.: Conf. Ser.

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Section: Laser Transmission Through Underdense Foamsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Applications of low-density foams for x-ray source studies and laser beam smoothing

Limpouch

Renner

Борисенко

et al. 2008

J. Phys.: Conf. Ser.

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“…The speckle pattern has a coherence time of less than the hydrodynamic timescale (1-10 ps), so that the ion fluid experiences a relatively uniform, time averaged, heating profile [21]. However, since the source of magnetic field generation is proportional to the gradients in electron pressure and laser intensity, these small scale-length speckles can be significant sources of magnetic field, and therefore the resulting fields can affect the hydrodynamics over longer timescales.…”

Section: Introductionmentioning

confidence: 99%

Rapid self-magnetization of laser speckles in plasmas by nonlinear anisotropic instability

2009

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View the article online for updates and enhancements. Abstract. Presented here are the first kinetic two-dimensional VlasovFokker-Planck calculations of inertial confinement fusion-related laser-plasma interactions, to include self-consistent magnetic fields, hydrodynamic plasma expansion and anisotropic electron pressure. An underdense plasma, reminiscent of the gas fill of a hohlraum, is heated by a laser speckle with I λ 2 = 1.0 × 10 15 W cm −2 µm 2 and radius w 0 = 5 µm. Inverse bremsstrahlung absorption of the laser and non-local electron transport lead to the development of a collisional analogue of the Weibel electromagnetic instability. The instability is seeded by magnetic fields, generated in an initial period of linear growth due to the anisotropic electron distribution arising in a laser speckle. Using the circular polarization does not generate significant fields. For linear polarization, the field generally saturates when the magnetization is ωτ ei > 1, and the effective growth rate is similar to the coherence time of typical laser speckles. The presence of these magnetic fluctuations significantly affects the heat fluxes and hydrodynamics in the plasma. Contents

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“…Also for improving the transport and transfer of the laser energy to the plasma, special materials were proposed, as well as using structured targets [3]. An example of such materials are low density volume-structured materials, which are being suggested for homogeneous distribution of laser intensity on target surface [4].…”

Section: Introductionmentioning

confidence: 99%

Investigation of low-coherence laser radiation interaction with different materials

Fronya

Борисенко

Merkuliev

et al. 2013

EPJ Web of Conferences

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Abstract. The paper presents the results of experiments on the interaction of low-coherence laser radiation with low density volume-structured materials and solid-state density materials, performed at the facility "KANAL-2" [1]. The data on scattering, absorption, and transport of low-coherence heating laser radiation through plasmas from low-density volume-structured materials and solid density materials have been analyzed. The experiments have demonstrated that laser radiation of low coherence effectively interacts with low density materials, and materials of solid-state density.

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Spatiotemporal smoothing of a laser beam employing a dynamic plasma phase plate

Cited by 12 publications

References 1 publication

Applications of low-density foams for x-ray source studies and laser beam smoothing

Applications of low-density foams for x-ray source studies and laser beam smoothing

Rapid self-magnetization of laser speckles in plasmas by nonlinear anisotropic instability

Investigation of low-coherence laser radiation interaction with different materials

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