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  • 1
    Digitale Medien
    Digitale Medien
    Two-dimensional effects in a tunnel ionized plasma (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 3040-3042 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: An intense short pulse laser of finite spot size propagating through a gas produces plasma via tunnel ionization on a femtosecond time scale. The radial profile of plasma density is strongly peaked on the axis and has a defocusing property. As electron density grows with time, the trailing part of the laser pulse suffers stronger divergence than the leading front, causing severe temporal distortion of the pulse. A self-consistent paraxial ray theory of electron density evolution and defocusing of the laser reveals that a square (in time) laser pulse, after propagating one Rayleigh length, has an order of magnitude difference in the axial intensity at the front and the tail of the pulse. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.872438
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  • 2
    Digitale Medien
    Digitale Medien
    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
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.859259
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  • 3
    Digitale Medien
    Digitale Medien
    Self-focusing of Langmuir waves in a plasma including the effect of Landau damping (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 4685-4687 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Langmuir waves have a tendency to self-focus around the intensity maxima at moderate power densities. A paraxial ray theory of self-focusing, through ponderomotive nonlinearity, reveals that the self-focusing length Rn(approximately-equal-to)avth/vosc where a is the radial width of the Langmuir wave, and vth and vosc are the electron thermal and oscillatory velocities. The damping tends to inhibit the self-focusing effect.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.343825
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  • 4
    Digitale Medien
    Digitale Medien
    Analysis of propagation in a SELFOC fibre: The axial field component and the effect of multiple reflections (1972)
    Springer
    Optical and quantum electronics 4 (1972), S. 51-55 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract Based on the WKB solution of the wave equation, a discussion of the polarization rotation of Gaussian beams in focusing fibres is given. Near the focusing region the change of polarization has been found to be appreciable. The finite longitudinal size of fibres has been found to reduce the effective length of samples for wave focusing.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01418400
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  • 5
    Digitale Medien
    Digitale Medien
    Effects of self-focusing on the selfdistortion of amplitude modulated microwaves in non-parabolic semiconductors (1973)
    Springer
    Optical and quantum electronics 5 (1973), S. 131-135 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract Omitting the dispersion of side bands, the self-distortion of an amplitude-modulated e.m. signal due to non-linear polarizability in nonparabolic semiconductors has been investigated. The distortion is basically due to self-focusing of the electromagnetic wave and is different from the resistive (absorption) type demodulation. In n-InSb and at average powers of ∼1 W the index of modulation is found to increase four times at a modulation frequency R~108 s−1.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01414733
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  • 6
    Digitale Medien
    Digitale Medien
    Rapid determination of ash in coke using Compton scattering (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 11 (1982), S. 154-155 
    Details
    ISSN: 0049-8246
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: The Compton scattering technique for rapid determination of ash content in coal has been extended to coke samples. Some improvements in respect of the sample preparation and possible line overlap and background have been incorporated. A modified regression equation used in this work to compute the x-ray data is found to yield good results.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/xrs.1300110403
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  • 7
    Digitale Medien
    Digitale Medien
    Compton scattering of x-rays: Some observations (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 13 (1984), S. 192-194 
    Details
    ISSN: 0049-8246
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: A set of experimental observations pertaining to Compton scattering of low-energy x-ray photons by matrices containing very light elements is reported.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/xrs.1300130414
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