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  • Articles: DFG German National Licenses  (6)
  • 1965-1969  (6)
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  • Articles: DFG German National Licenses  (6)
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Year
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  • 1
    Electronic Resource
    Electronic Resource
    Theorie des stimulierten Raman-Effekts (1965)
    Springer
    The European physical journal 184 (1965), S. 395-432 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We consider stimulated Raman emission in solids, placed in a plane laser beam external to the cavity. The Hamiltonian of the system of phonons, electrons and electromagnetic fields is derived within the framework of a generalized adiabatic approximation for electrons and nuclei. It contains terms due to nonlinear interactions between electrons and phonons. Because the usual time-dependent perturbation theory cannot describe coherence effects properly we turn toHeisenberg's equations of motion for the operators of photons, phonons and electron excitations. In order to solve these equations in the steady state we apply an iteration procedure. We start with the light waves which give rise to electron transitions. The electrons such excited create phonons which then react on the electrons. Finally the electrons are coupled again to the lightfield. This procedure yields besides the usual wellknown Raman process two main processes occurring in stimulated Raman emission: a coupled two step Raman process and a parametric process. In the first one two phonons are involved. If the linewidth of phonons is comparable to the phonon frequencies the non-resonant parts of the above processes also become important. In solving the set of coupled equations for the light amplitudes, obtained from the iteration procedure, we only consider terms due to the first Stokes, the first anti-Stokes and the laser line. We then find frequency shifts of these lines due to the stimulated emission which are of the order of the linewidth of photons if this linewidth is very much smaller than that of phonons as it is the case in solids. This means that the coupled two step Raman process is dominant, in good agreement with measurements ofChiao andStoicheff in calcite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01381312
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of spontaneous emission and of finite phonon lifetime on Stimulated Raman Scattering (1967)
    Springer
    The European physical journal 207 (1967), S. 235-250 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study the influence of the spontaneous emission and of the damping of the molecular vibrations on Stimulated Raman Scattering in liquids starting from the Heisenberg equations for the laser wave, for the 1. Stokes wave, and for the molecular vibrations. The spontaneous emission is described by fluctuating Langevin forces. In the linearized case the Heisenberg equations are solved analytically. In order to investigate saturation effects the amplitude equations are transformed into generalized rate equations, which are solved numerically. To demonstrate the results they are plotted in several figures, showing the growth and the lineshape of the 1. Stokes wave, the ratio of Stokes photons and phonons and the saturation behaviour of the phonons and the Stokes and laser photons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01326138
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Stimulated Raman scattering in solids (1965)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 16 (1965), S. 34-34 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01589040
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  • 4
    Electronic Resource
    Electronic Resource
    On the theory of Stimulated Brillouin Scattering in Liquids (1967)
    Springer
    The European physical journal 201 (1967), S. 59-68 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A calculation of Stimulated Brillouin Scattering in Liquids has been made for the steady state, analytically in the lossless case and by a machine calculation if acoustic loss is introduced. The effective interaction length in CS2 has been found to be of the order of 2×10−2 cm. Therefore no higher order Stokes waves can be produced with appreciable magnitudes, even if the first order Stokes wave has large intensity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01380103
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Theory of mode pulling in a stokes Raman oscillator. I (1968)
    Springer
    The European physical journal 213 (1968), S. 361-374 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the present paper frequency shifts and other characteristic properties of the Stokes modes in a solid Raman-active sample are investigated theoretically. The Raman process is described by nonlinear Heisenberg equations for running waves, which is convenient in order to satisfy the momentum conservation condition. The Stokes shifted electromagnetic waves are assumed to be reflected at the endfaces of the crystal to establish standing waves (modes), whereas the vibrational waves are treated as running waves because of their large damping. The calculations are done for (a) one mode in the 1. Stokes line, (b) one mode in the 1. and one mode in the 2. Stokes line and (c) two modes in the 1. Stokes line. Case (c) can be established only if the two modes are placed symmetrically with respect to the center of the line. In all three cases homogeneously broadened lines are assumed. The frequency shifts in (a) and (c) are power-independent. Only in (b) the shift of the 1. Stokes mode depends on the incident laser flux. Nonlinear pulling and power-dependent pushing of arbitrarily situated modes in the 1. Stokes line occur if additonal modes oscillate simultaneously in the higher order lines. Detailed calculations of these interesting cases are given in a forthcoming paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01385482
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Einsatz gas-chromatographischer Kolonnen hoher Trennleistung in direkter Kombination mit Massenspektrometer (1966)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 49 (1966), S. 1768-1778 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A routine instrument for the combination of a single focusing mass spectrometer with high efficiency tubular as well as packed GC columns using a molecule separator is described. The application of the unit in the analysis of cigarette smoke is given.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19660490610
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    Paper (German National Licenses)
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