scholarly journals Collisional effects on the modulational instability of intense laser pulses in magnetoactive plasmas

2015 ◽  
Vol 33 (4) ◽  
pp. 705-711
Author(s):  
A. R. Niknam ◽  
S. Barzegar ◽  
B. Bokaei ◽  
F. Haji Mirzaei ◽  
A. Aliakbari
Keyword(s):  
Growth Rate ◽  
Collision Frequency ◽  
Modulational Instability ◽  
Expansion Method ◽  
Laser Pulses ◽  
Magnetized Plasma ◽  
Intense Laser ◽  
Intense Laser Pulse ◽  
Intense Laser Pulses ◽  
Wavenumber Region

AbstractThe modulational instability associated with propagation of an intense laser pulse through a transversely magnetized plasma is investigated in the presence of collisional effects. The source-dependent expansion method for analyzing the wave equation is employed. The dispersion relation is obtained and modulational instability and its growth rate are studied. It is shown that in the absence of collisional effects the modulational instability is restricted to the small wavenumber region and the constant magnetic field reduces the growth rate of the instability. In contrast, in the collisional plasma, there is no upper limit of wavenumber for the existence of modulational instability. In addition, in this case, the growth rate of instability increases as the collision frequency goes up.

Nonlinear theory of propagation of intense laser pulses in magnetized plasma

2002 ◽  
Vol 9 (1) ◽  
pp. 263-266 ◽  
Author(s):  
Navina Wadhwani ◽  
Punit Kumar ◽  
Pallavi Jha
Keyword(s):  
Nonlinear Theory ◽  
Laser Pulses ◽  
Magnetized Plasma ◽  
Intense Laser ◽  
Intense Laser Pulses

Modulational instability of an ultra-intense laser pulse in electron–positron plasmas

2013 ◽  
Vol 79 (5) ◽  
pp. 771-776 ◽  
Author(s):  
QIANG-LIN HU ◽  
GUI-LAN XIAO ◽  
XIAO-GUANG YU
Keyword(s):  
Growth Rate ◽  
Laser Pulse ◽  
Vacuum Polarization ◽  
Laser Intensity ◽  
Modulational Instability ◽  
Instability Growth Rate ◽  
Intense Laser ◽  
Intense Laser Pulse ◽  
Electron Positron ◽  
Instability Growth

AbstractThis paper investigates the modulational instability of a linearly polarized ultra-intense laser pulse propagating in electron–positron plasmas. Based on the wave equation, which contains vacuum polarization and magnetization effects, the nonlinear dispersion relation and the growth rate of instability are obtained and the effects of plasma number density and laser intensity on the growth rate are analyzed. Numerical results show that if the laser intensity is high enough, the modulational instability growth rate induced by vacuum polarization and magnetization nonlinearity can dominate the modulational instability growth rate induced by the nonlinearity associated with a relativistic effect and ponderomotive force.

scholarly journals Nonlinear Thomson backscattering of intense laser pulses by electrons trapped in plasma-vacuum boundary

2009 ◽  
Vol 27 (3) ◽  
pp. 365-370 ◽  
Author(s):  
Jiansheng Liu ◽  
Changquan Xia ◽  
Li Liu ◽  
Ruxin Li ◽  
Zhizhan Xu
Keyword(s):  
Laser Field ◽  
Second Harmonic ◽  
Laser Pulses ◽  
Intense Laser ◽  
Intense Laser Pulse ◽  
Spectral Filtering ◽  
Plasma Surface ◽  
X Ray ◽  
Intense Laser Pulses ◽  
Relativistic Factor

AbstractWe present the idea of intensified attosecond X-ray generation based on nonlinear Thomson backscattering of an intense laser pulse by electrons trapped in plasma-vacuum boundary. Two frequency up-conversions due to the relativistic Doppler effect and longitudinal γ-spike effect are analyzed, respectively, where γ is the relativistic factor of the plasma surface. Relativistic resonance heating conditions should be used as a criterion for the experimental design to obtain efficient high-order harmonics and energetic electrons' generation at relatively low laser intensities. Shaping the laser field by proposing a detuned second-harmonic can generate a single attosecond pulse without spectral filtering.

scholarly journals High laser induced damage threshold photoresists for nano-imprint and 3D multi-photon lithography

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Elmina Kabouraki ◽  
Vasileia Melissinaki ◽  
Amit Yadav ◽  
Andrius Melninkaitis ◽  
Konstantina Tourlouki ◽  
...  
Keyword(s):  
Nanoimprint Lithography ◽  
Three Dimensional ◽  
Damage Threshold ◽  
Laser Pulses ◽  
Intense Laser ◽  
Optical Elements ◽  
Photonic Circuits ◽  
Future Production ◽  
Intense Laser Pulses ◽  
Laser Induced Damage

Abstract Optics manufacturing technology is predicted to play a major role in the future production of integrated photonic circuits. One of the major drawbacks in the realization of photonic circuits is the damage of optical materials by intense laser pulses. Here, we report on the preparation of a series of organic–inorganic hybrid photoresists that exhibit enhanced laser-induced damage threshold. These photoresists showed to be candidates for the fabrication of micro-optical elements (MOEs) using three-dimensional multiphoton lithography. Moreover, they demonstrate pattern ability by nanoimprint lithography, making them suitable for future mass production of MOEs.

scholarly journals Precise description of single and double ionization of hydrogen molecule in intense laser pulses

2012 ◽  
Vol 137 (4) ◽  
pp. 044112 ◽  
Author(s):  
Mohsen Vafaee ◽  
Firoozeh Sami ◽  
Babak Shokri ◽  
Behnaz Buzari ◽  
Hassan Sabzyan
Keyword(s):  
Hydrogen Molecule ◽  
Laser Pulses ◽  
Double Ionization ◽  
Intense Laser ◽  
Precise Description ◽  
Intense Laser Pulses

scholarly journals Concept of generation of extremely compressed high-energy electron bunches in several interfering intense laser pulses with tilted amplitude fronts

2012 ◽  
Vol 31 (1) ◽  
pp. 23-28 ◽  
Author(s):  
V.V. Korobkin ◽  
M.Yu. Romanovskiy ◽  
V.A. Trofimov ◽  
O.B. Shiryaev
Keyword(s):  
Laser Pulses ◽  
High Energy ◽  
Intense Laser ◽  
High Energy Electron ◽  
Speed Of Light ◽  
Electron Bunches ◽  
Newton Equation ◽  
High Energies ◽  
Neutral Gas ◽  
Intense Laser Pulses

AbstractA new concept of generating tight bunches of electrons accelerated to high energies is proposed. The electrons are born via ionization of a low-density neutral gas by laser radiation, and the concept is based on the electrons acceleration in traps arising within the pattern of interference of several relativistically intense laser pulses with amplitude fronts tilted relative to their phase fronts. The traps move with the speed of light and (1) collect electrons; (2) compress them to extremely high density in all dimensions, forming electron bunches; and (3) accelerate the resulting bunches to energies of at least several GeV per electron. The simulations of bunch formation employ the Newton equation with the corresponding Lorentz force.

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