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  • 1
    Digitale Medien
    Digitale Medien
    Self-focusing of electromagnetic waves in a degenerate electron-hole plasma (1974)
    Springer
    Applied physics 3 (1974), S. 141-148 
    Details
    ISSN: 1432-0630
    Schlagwort(e): Self-focusing of e.m. waves ; Nonlinear media ; Electron-hole plasma
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00884412
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  • 2
    Digitale Medien
    Digitale Medien
    Amplification in Ni-like Nb at 204.2 Å pumped by a table-top laser (1993)
    Springer
    Applied physics 57 (1993), S. 303-307 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 32.30.Rj ; 42.55.Vc ; 42.60.Lh
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We identified for the first time the 3d 94d 1 S − 3d 94p 1 P line in Ni-like Nb at 204.2 Å that was predicted to show gain. When pumped with a train of pulses containing less than 1 J per pulse, significant emission was recorded at 204.2 Å following the second and the third pulses. We measured the small signal gain coefficient per Joule of incident laser energy to be 1.49±0.42 cm−1 J−1 for this laser transition, which is higher by several orders of magnitude than that reported for other collisional laser systems in this wavelength range.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00332453
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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