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  • Articles  (48)
  • Articles: DFG German National Licenses  (48)
  • 42.65  (27)
  • 82.65  (21)
  • 2020-2024
  • 1985-1989  (48)
  • 1988  (48)
  • Physics  (48)
  • 1
    Electronic Resource
    Electronic Resource
    Analysis of Raman gain for focussed Gaussian pump beams (1988)
    Springer
    Applied physics 45 (1988), S. 37-44 
    Details
    ISSN: 1432-0649
    Keywords: 42.65 ; 78.30j
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Several theoretical and numerical models have been published which describe the evolution of a Stokes beam in a Raman medium excited by a focussed pump beam. Generally, the published theoretical departures from the plane-wave theory of Raman scattering are based on assumptions about the power of the pump beam. In this paper we present a theoretical model which is shown to be in excellent agreement with an exact numerical treatment, and which is valid without restrictions on the pump power. Its predictions are used to indicate the range of validity of earlier theories.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692339
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  • 2
    Electronic Resource
    Electronic Resource
    CARS spectroscopy of molecules and clusters in supersonic jets (1988)
    Springer
    Applied physics 45 (1988), S. 205-214 
    Details
    ISSN: 1432-0649
    Keywords: 42.65 ; 33.20.Fb ; 36.40.+d ; 34.50.Ez
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Supersonic molecular beams of D2, CH4, NH3, and C2H4 are investigated in the expansion region employing collinear coherent anti-Stokes Raman spectroscopy (CARS). The analysis of rotationally resolved CARS spectra allows the determination of temperatures in the beam. The rotational relaxation as a function of stagnation pressure and separation from the nozzle is studied by recording theQ branch for D2 and the ν3 R andS branches for CH4. Rotational temperatures for NH3 are determined by investigating the complete ν3 band. At strong stagnation conditions broad structures arise which can be attributed to the formation of NH3 clusters. For C2H4 the ν5 band with resolved rotational structure is reported. Again, at larger distances from the nozzle, broad structures are observed. They are assigned to the ν1 and ν5 vibrations in the C2H4 cluster.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00687148
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  • 3
    Electronic Resource
    Electronic Resource
    Coherent vacuum ultraviolet generation by frequency mixing in glass hollow waveguides (1988)
    Springer
    Applied physics 45 (1988), S. 293-299 
    Details
    ISSN: 1432-0649
    Keywords: 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Efficiency for vuv generation in a glass hollow waveguide has been compared with that obtained by tight focussing of the primary radiation. Coherent vuv radiation is generated by resonant four-wave difference frequency mixing and four-wave parametric processes in xenon. At vuv wavelengths close to the 5p-6s resonance, the efficiency of generation was found to be enhanced by a factor of up to 2.5 under phase-matched conditions. The measured enhancement is limited by losses due to absorption of the generated radiation and by propagation losses of the primary beams along the waveguide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00687159
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  • 4
    Electronic Resource
    Electronic Resource
    The influence of phase-modulation on femtosecond time-resolved coherent Raman spectroscopy (1988)
    Springer
    Applied physics 47 (1988), S. 307-312 
    Details
    ISSN: 1432-0649
    Keywords: 42.65 ; 42.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The influence of phase-modulation on femtosecond time-resolved coherent Raman scattering is investigated theoretically and experimentally. The coherent Raman signal taken as a function of the spectral position shows unexpected temporal oscillations close to time zero. A theoretical analysis of the coherent Raman scattering process indicates that the femtosecond light pulses are amplitude and phase modulated. The pulses are asymmetric in time with more slowly decaying trailing wings. The phase of the pulse amplitude contains quadratic and higher-order contributions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00716091
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  • 5
    Electronic Resource
    Electronic Resource
    Subnanosecond pulse measurements of 10.6 μm radiation with tellurium (1988)
    Springer
    Applied physics 46 (1988), S. 103-109 
    Details
    ISSN: 1432-0649
    Keywords: 42.60 ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Subnanosecond infrared pulses have been measured by noncollinear secondharmonic generation in tellurium. The method is very practical because due to the high refractive index the fine tuning of the phase matching is easily obtained by rotating the crystal around the optic axis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00698659
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  • 6
    Electronic Resource
    Electronic Resource
    Surface structure of cubic ionic crystals studied by optical second-harmonic generation (1988)
    Springer
    Applied physics 46 (1988), S. 131-138 
    Details
    ISSN: 1432-0649
    Keywords: 42.65 ; 68.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Polarization and azimuthal dependencies of optical second-harmonic generation at the surface of cubic ionic crystals have been measured on polished surfaces of BaF2 (111) and (100), CaF2 (111) and NaCl (111), using a fundamental wavelength of 532 nm. The results are interpreted in terms of available theory, which shows that for transparent cubic media only the dipolar surface contribution depends on the crystal orientation. For BaF2 (111) and NaCl (111) the crystallineC 3vgeometry could be identified but not for CaF2 (111). Although the nature of the electronic surface structure giving rise to a dipolar polarizability remains undetermined, the experimental result suggests that it may be due to impurity or defect states in the band gap at the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00686465
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  • 7
    Electronic Resource
    Electronic Resource
    Analytic evaluation of high-order susceptibilities in multiwave mixing (1988)
    Springer
    Applied physics 46 (1988), S. 185-190 
    Details
    ISSN: 1432-0649
    Keywords: 45.20 ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A dynamical system consisting of a multilevel atomic gas medium subject to an electromagnetic field is analyzed by the density-matrix equations of motion. All stochastic processes such as elastic and inelastic atomic collisions and spontaneous emission are described by a damping matrix. Analytical expressions for the density-matrix elements to any order of perturbation theory (without any multipolar and rotating wave approximations) are obtained by means of the Laplace-transform method in a diagonal representation of the damping matrix. Closed formulae for the high-order susceptibilities are derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00686474
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  • 8
    Electronic Resource
    Electronic Resource
    Numerical analysis of pulse generation in synchronously mode-locked cw dye lasers (1988)
    Springer
    Applied physics 45 (1988), S. 101-108 
    Details
    ISSN: 1432-0649
    Keywords: 42.55M ; 42.60F ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present theoretical results on the characteristics of pulses generated by a synchronously pumped dye laser. Our analysis indicates the important influence of spontaneous emission on shape and frequency chirp of the pulse. Dye-laser operation is possible within a wide range of cavity mismatch. A large mismatch of the lengths of the dye and the pump-laser cavity results in the generation of “noise bursts” caused by the influence of spontaneous emission. At small cavity mismatch pulse profile and frequency chirp of the pulse are directly generated in the steady-state regime by algebraic equations. Our formulas indicate that the sign of the pulse chirp depends only on the sign of the shift between laser frequency and centre frequency of the amplifying transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694324
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  • 9
    Electronic Resource
    Electronic Resource
    Transient effects in four-wave mixing in photorefractive Passive Phase Conjugate Mirrors (1988)
    Springer
    Applied physics 45 (1988), S. 129-135 
    Details
    ISSN: 1432-0649
    Keywords: 42.65 ; 42.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Partial differential equations are set up and solved partly analytically, partly numerically for the spatial and temporal variation of the amplitudes and phases of the four beams participating in four-wave mixing in a linear Passive Phase Conjugate Mirror. The instantaneous frequency of the resonating beam is also determined. It is shown that the duration and main features of the transient regime are determined not only by the properties of the photorefractive crystal but also by the external optical circuit, in particular by the quality factor and detuning of the resonator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00695281
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  • 10
    Electronic Resource
    Electronic Resource
    Determination of temperature and concentration of molecular nitrogen, oxygen and methane with coherent anti-stokes raman scattering (1988)
    Springer
    Applied physics 45 (1988), S. 183-190 
    Details
    ISSN: 1432-0649
    Keywords: 33.20 ; 37.70 ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Temperature and concentration measurements by Coherent Anti-Stokes Raman Scattering (CARS) of molecular nitrogen, oxygen and methane were carried out. A comparison of corrected thermocouple and CARS temperature measurements in a high-temperature furnace up to 2000 K is presented. The temperature dependent CARS spectra of N2 and O2 are evaluated by a simulation program. Agreement between CARS and thermocouple temperatures is obtained within 40 K for N2 and 80 K for O2. Good agreement is found between measurements and calculations of the decrease of CARS intensity with temperature. Various “quick-fit” methods for N2-and O2-temperature measurements from temperature sensitive spectral parameters were tested. Temperature dependent CARS spectra of thev 1-fundamental of methane are recorded and the methane CARS intensity as function of temperature is measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00695289
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