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  • 1
    Electronic Resource
    Electronic Resource
    Growth of a spike on a laser beam in a plasma (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 1221-1223 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An on-axis spike in the intensity distribution of a Gaussian laser beam grows rapidly as the beam propagates in a laser-produced plasma. The nonlinearity arises through the ponderomotive force and has a saturating behavior. For vosc ∼vth, the optimum spike radius is approximately a few c/ωp0 and the amplification length is ∼2cω/ω2p0, where ωp0 is the unperturbed plasma frequency, ω is the radiation frequency, and vosc and vth are oscillatory and thermal velocities of electrons, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859259
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  • 2
    Electronic Resource
    Electronic Resource
    Growth of a nonuniform ripple on a Gaussian beam in a plasma (1979)
    Springer
    Applied physics 18 (1979), S. 97-103 
    Details
    ISSN: 1432-0630
    Keywords: 50 ; 84
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract In the present paper we have investigated the growth of a radially symmetrical ripple, superimposed on a Gaussian beam propagating in a plasma. The effect of the position and the width of the ripple on its growth has been studied in some detail. The present analysis considers two mechanisms for the redistribution of carriers in the plasma and the effect of redistribution on the growth of the ripple; the two mechanisms are nonuniform collision dominated heating of the carriers and the ponderomotive force arising on account of nonuniform intensity distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00935910
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  • 3
    Electronic Resource
    Electronic Resource
    Nonlinear oscillatory waveguide propagation in a plasma (1975)
    Springer
    Applied physics 6 (1975), S. 119-123 
    Details
    ISSN: 1432-0630
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The presence of an intense Gaussian laser beam gives rise to a ponderomotive force on electrons in a collisionless plasma, leading to a redistribution of electron density along the wave-front and consequently to an intensity dependent dielectric constant which saturates with increasing intensity. The intensity dependent dielectric constant is responsible for beam propagation in an oscillatory waveguide. It is seen that (i) a beam of radiusr 0 less thanr 0min (≃c/ω p) cannot be focused in the plasma regardless of its power, (ii) minimum dimension of oscillatory waveguide increases with increasing power of the beam. Similar results are also obtained for collisional plasma where nonlinearity arises due to nonuniform heating and consequent redistribution of carriers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00883558
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  • 4
    Electronic Resource
    Electronic Resource
    Nonlinear electromagnetic propagation in plasma filled cylindrical waveguides (1976)
    Springer
    Applied physics 11 (1976), S. 299-301 
    Details
    ISSN: 1432-0630
    Keywords: 52 ; 84
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Using an appropriate expression for the field-dependent dielectric constant of a collisionless plasma, we have studied the field distribution of the TM01 mode in a cylindrical waveguide. The wave equation has been solved by a Runge Kutta technique. It is seen that on account of redistribution of carriers from the high-field regions to low-field regions a beam of frequency lower than the average plasma frequency can be transmitted if its power is high.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00897070
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  • 5
    Electronic Resource
    Electronic Resource
    Self focusing of electromagnetic beams in InSb: Predominance of nonlocal effects (1973)
    Springer
    Applied physics 2 (1973), S. 39-42 
    Details
    ISSN: 1432-0630
    Keywords: Self focusing ; Nonlinear medium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract On the basis of a phenomenological treatment, the nonlinear dielectric constant of nondegenerate nonparabolic semiconductors like InSb (having both +e and −e carriers) has been studied for Gaussian electromagnetic beams. The nonlinearity resulting from redistribution of carriers in the sample at low temperatures has been shown to be an order of magnitude higher than that due to the non-parabolicity of energy bands. Self focusing of electromagnetic beams as a result of these nonlinearities has been discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00900490
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  • 6
    Electronic Resource
    Electronic Resource
    Self distortion of a Gaussian electromagnetic pulse in a plasma (1974)
    Springer
    Applied physics 3 (1974), S. 213-216 
    Details
    ISSN: 1432-0630
    Keywords: Self distortion of an e.m. pulse ; Nonlinear pulse propagation ; Pulse propagation in a plasma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract On the basis of perturbation theory, the phenomenon of nonlinear self distortion of an electromagnetic pulse (Gaussian in time) in a collisional plasma has been studied. The nonlinearity appears through the modulation of electron collision frequency by the power absorption from the wave. At moderate energies of the pulse, considerable distortion in the amplitude envelope has been predicted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00884499
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  • 7
    Electronic Resource
    Electronic Resource
    Self-focusing of electromagnetic waves in a degenerate electron-hole plasma (1974)
    Springer
    Applied physics 3 (1974), S. 141-148 
    Details
    ISSN: 1432-0630
    Keywords: Self-focusing of e.m. waves ; Nonlinear media ; Electron-hole plasma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The free carrier nonlinear dielectric constant of a degenerate electron-hole plasma (e.g., Ge) in the presence of a Gaussian electromagnetic beam has been studied by a kinetic treatment. The redistribution of carriers (electrons and holes) is the source of nonlinearity and is effective in causing the self-focusing of the beam. The rise in carrier temperature due to the wave field is almost unaffected by the degeneracy, whereas the nonlinearity is considerably affected by it. The increase of degeneracy (by increasing the equilibrium carrier concentration at the fixed lattice temperature) increases the nonlinear dielectric constant. Hence self-focusing is enhanced by degeneracy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00884412
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  • 8
    Electronic Resource
    Electronic Resource
    Self distortion of an amplitude modulated electromagnetic beam in a plasma: Relaxation effects (1974)
    Springer
    Applied physics 5 (1974), S. 153-157 
    Details
    ISSN: 1432-0630
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Following a phenomenological approach an expression for the nonlinear current density in a plasma in the presence of an amplitude-modulated two-dimensional Gaussian (in space) electromagnetic beam has been derived. This expression has been used to study the nonstationary self focusing and resulting self distortion of the beam. The amplitude maxima/minima of the beam are focused by different amounts giving rise to a moving periodic focus and an overmodulation of the beam. The effect of finite values of relaxation times, involved in the nonlinearity, is to shift the amplitude envelope on the time scale.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00928228
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  • 9
    Electronic Resource
    Electronic Resource
    Self-focusing of laser beams in inhomogeneous dielectrics (1971)
    Springer
    Optical and quantum electronics 3 (1971), S. 157-161 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract This paper presents a theoretical investigation of the propagation and focusing of an electromagnetic wave in an inhomogeneous dielectric whose dielectric constant is given byɛ=ɛ 0(z)+Φ(r, z), whereZ-axis is the direction of propagation of the beam. The quantity Φ(r, z) may either be due to non-linear effects or due to inhomogeneity in the actual fabrication of the guide. Numerical calculations show that for a cylindrically symmetrical Gaussian beam, even a small axial inhomogeneity has appreciable effect on self-focusing; if the real part ofdɛ 0 (z)/dz is larger than zero the focusing effect increases withz, and vice-versa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01419331
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  • 10
    Electronic Resource
    Electronic Resource
    Hot carrier diffusion induced instabilities of electromagnetic waves in plasmas and semiconductors (1973)
    Springer
    Optical and quantum electronics 5 (1973), S. 509-516 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The stability of a plasma/semiconductor for small fluctuations in the intensity of plane electromagnetic beam has been studied when a non-linearity in the dielectric constant appears on account of the diffusion of non-uniformly heated carriers (due to fluctuations in the intensity of the beam). Fluctuations of optimum size and long duration have been found to grow at moderate powers. The effect of absorption is, however, to suppress this effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02109656
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