The Interaction of High-Power Lasers with Plasmas

Eliezer, S.

doi:10.1201/9781420033380

Cited by 115 publications

(196 citation statements)

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“…The electric field in the plasma is equal to E͞ 1/4 (30). Thus, when the plasma frequency becomes close to the laser frequency , the electric field experiences a strong enhancement, further increasing impact ionization and producing a run-away process that will stop when all the valence electrons are ionized.…”

Section: A Mechanistic Explanation For the Deterministic Character Ofmentioning

confidence: 99%

Optics at critical intensity: Applications to nanomorphing

Joglekar

Liu

Meyhöfer

et al. 2004

Proc. Natl. Acad. Sci. U.S.A.

251

169

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Laser-induced optical breakdown by femtosecond pulses is extraordinarily precise when the energy is near threshold. Despite numerous applications, the basis for this deterministic nature has not been determined. We present experiments that shed light on the basic mechanisms of light-matter interactions in this regime, which we term ''optics at critical intensity.'' We find that the remarkably sharp threshold for laser-induced material damage enables the structure or properties of materials to be modified with nanometer precision. Through detailed study of the minimum ablation size and the effects of polarization, we propose a fundamental framework for describing light-matter interactions in this regime. In surprising contrast to accepted damage theory, multiphoton ionization does not play a significant role. Our results also reject the use of the Keldysh parameter in predicting the role of multiphoton effects. We find that the dominant mechanism is Zener ionization followed by a combination of Zener and Zenerseeded avalanche ionization. We predict that the minimum feature size ultimately depends on the valence electron density, which is sufficiently high and uniform, to confer deterministic behavior on the damage threshold even at the nanoscale. This behavior enables nanomachining with high precision, which we demonstrate by machining highly reproducible nanometer-sized holes and grooves in dielectrics.

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Section: A Mechanistic Explanation For the Deterministic Character Ofmentioning

confidence: 99%

Optics at critical intensity: Applications to nanomorphing

Joglekar

Liu

Meyhöfer

et al. 2004

Proc. Natl. Acad. Sci. U.S.A.

251

169

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“…1. Two runs for the lower laser intensity 10 15 W/cm 2 -collisionless and with collisions included -are compared in panel a) with an estimate from the theoretical collisional absorption model [4]. The overall reflectivity in the collisionless case is more than 60% and the reflected light comes in a series of intense bunches that originate from the convectively amplified SBS waves.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

Laser plasma physics in shock ignition – transition from collisional to collisionless absorption

Klimo

Tikhonchuk

Ribeyre

et al. 2013

EPJ Web of Conferences

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Abstract. Shock Ignition is considered as a relatively robust and efficient approach to inertial confinement fusion. A strong converging shock, which is used to ignite the fuel, is launched by a high power laser pulse with intensity in the range of 10 15 − 10 16 W/cm 2 (at the wavelength of 351 nm). In the lower end of this intensity range the interaction is dominated by collisions while the parametric instabilities are playing a secondary role. This is manifested in a relatively weak reflectivity and efficient electron heating. The interaction is dominated by collective effects at the upper edge of the intensity range. The stimulated Brillouin and Raman scattering (SBS and SRS respectively) take place in a less dense plasma and cavitation provides an efficient collisionless absorption mechanism. The transition from collisional to collisionless absorption in laser plasma interactions at higher intensities is studied here with the help of large scale one-dimensional Particle-in-Cell (PIC) simulations. The relation between the collisional and collisionless processes is manifested in the energy spectrum of electrons transporting the absorbed laser energy and in the spectrum of the reflected laser light.

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“…The later parts of the light pulse penetrate only up to a density called 'critical layer' [28]. Figure 11 explains some of the essential parameters involved in the process.…”

Section: Dense Matter In Intense Laser Fieldsmentioning

confidence: 99%

Intense, ultrashort light and dense, hot matter

Kumar

2009

Pramana - J Phys

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This article presents an overview of the physics and applications of the interaction of high intensity laser light with matter. It traces the crucial advances that have occurred over the past few decades in laser technology and nonlinear optics and then discusses physical phenomena that occur in intense laser fields and their modeling. After a description of the basic phenomena like multiphoton and tunneling ionization, the physics of plasma formed in dense matter is presented. Specific phenomena are chosen for illustration of the scientific and technological possibilities -simulation of astrophysical phenomena, relativistic nonlinear optics, laser wakefield acceleration, laser fusion, ultrafast real time X-ray diffraction, application of the particle beams produced from the plasma for medical therapies etc. A survey of the Indian activities in this research area appears at the end.

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The Interaction of High-Power Lasers with Plasmas

Cited by 115 publications

References 0 publications

Optics at critical intensity: Applications to nanomorphing

Optics at critical intensity: Applications to nanomorphing

Laser plasma physics in shock ignition – transition from collisional to collisionless absorption

Intense, ultrashort light and dense, hot matter

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