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  • Articles  (14)
  • Articles: DFG German National Licenses  (14)
  • 42.80  (14)
  • 1985-1989  (14)
  • 1988  (14)
  • Physics  (14)
Collection
  • Articles  (14)
Source
  • Articles: DFG German National Licenses  (14)
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Years
  • 1985-1989  (14)
Year
Topic
  • Physics  (14)
  • 1
    Electronic Resource
    Electronic Resource
    Multi-color CARS for hydrogen-fueled scramjet applications (1988)
    Springer
    Applied physics 45 (1988), S. 215-223 
    Details
    ISSN: 1432-0649
    Keywords: 07.60 ; 33.00 ; 42.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An approach to CARS, with considerable potential as a diagnostic for advanced airbreathing propulsion devices, is described and demonstrated. The technique is capable of providing simultaneous measurements of the major constitutents in H2/air combustion. The method employs both broadband and narrowband Stokes beams to generate CARS via two, two-color and two, three-color wave mixing processes. Temperature and concentration information are simultaneously available from N2, H2, and H2O. This permits the disappearance of fuel and appearance of product to be monitored. An analysis of the technique's capabilities and future improvements are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00687149
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  • 2
    Electronic Resource
    Electronic Resource
    Optical pulse narrowing using a Fabry-Perot resonator (1988)
    Springer
    Applied physics 47 (1988), S. 295-297 
    Details
    ISSN: 1432-0649
    Keywords: 42.80 ; 42.90
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An optical pulse narrowing technique by spectral windowing using a Fabry-Perot resonator is demonstrated. A 150 ps pulse from a mode-locked Ar ion laser has been compressed by a factor of 2.7.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00716088
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  • 3
    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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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Amplification in photorefractive materials via a higher order wave (1988)
    Springer
    Applied physics 45 (1988), S. 125-128 
    Details
    ISSN: 1432-0649
    Keywords: 42.65 ; 42.40 ; 42.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is shown that power exchange is possible in photorefractive materials even though the grating produced by the two incident waves is in phase with their interference pattern. The reason is that the interaction of the principal waves will produced higher order waves and their presence will form further gratings which assist power transfer between the principle beams. Under favourable conditions significant amounts of power may be transferred.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00695280
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  • 6
    Electronic Resource
    Electronic Resource
    Anisotropic fibers with elliptical deformed core (1988)
    Springer
    Applied physics 47 (1988), S. 21-25 
    Details
    ISSN: 1432-0649
    Keywords: 42.80 ; 42.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Weakly guiding, anisotropic step-index fibers with an elliptical core are investigated for the case that the refractive index tensor is everywhere diagonalized along the axes of fibers. The mode field and its leaky-mode-loss expression are given together with some numerical results which show that the influence of ellipticity is small compared with the effect of fiber anisotropy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696204
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  • 7
    Electronic Resource
    Electronic Resource
    Automatic impedance matching and opto-Hertzian effect in RF excited CO2 waveguide lasers (1988)
    Springer
    Applied physics 47 (1988), S. 149-157 
    Details
    ISSN: 1432-0649
    Keywords: 42.55 ; 42.60 ; 42.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report the successful operation of a novel automatic impedance matching technique (AIMing) and observations of the opto-Hertzian effect. The AIMing system is capable of maintaining efficient RF power delivery to a CO2 waveguide laser over a wide range of operating conditions. The opto-Hertzian signal, produced by circulating laser power fluctuations and detected in the RF reflected power, has some interesting properties and may be used for laser frequency stabilisation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00684082
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  • 8
    Electronic Resource
    Electronic Resource
    Relative time parameters of optogalvanic responses (1988)
    Springer
    Applied physics 46 (1988), S. 79-86 
    Details
    ISSN: 1432-0649
    Keywords: 32.00 ; 34.00 ; 42.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New optogalvanic response relative time features, such as signal growth and decay speeds, are suggested. These criteria can characterize signal time response parameters, as well as determine which particular type of gas internal quantum process is dominant during a given stage of response development. The general theoretical concepts reported here are compared with experimental results which are based on resonant optogalvanic effects in neon discharges and on non-resonant optogalvanic signals in neon and argon prebreakdown discharges. These new time characteristics are conceptually pleasing and permit study of the influence of individual factors such as bias and incident laser irradiation on overall gas response.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00698656
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  • 9
    Electronic Resource
    Electronic Resource
    Digital optical computing (1988)
    Springer
    Applied physics 46 (1988), S. 111-120 
    Details
    ISSN: 1432-0649
    Keywords: 42.30 ; 42.80 ; 85.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The motivation for a digital optical computer is based on the shortcomings inherent in of electronic computers. Optics has solutions to offer especially in interconnects. Devices based on nonlinear optical effects are still in the early stages of their development. Hence at an intermediate stage hybrid opto-electronic computers might emerge. Their architectures should make use of the special attributes of optics. A specific approach called symbolic substitution logic is outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00686462
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  • 10
    Electronic Resource
    Electronic Resource
    Optical switching of semiconductor laser amplifiers (1988)
    Springer
    Applied physics 46 (1988), S. 35-41 
    Details
    ISSN: 1432-0649
    Keywords: 42.80 ; 92.65 ; 42.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The underlying physics of optical switching in bistable diode-laser amplifiers is reviewed. The importance of minimizing the switching energy of optical bistable devices is emphasized. It is shown that conventional diode-laser amplifiers are switched with only thousands of photons in less than a nanosecond. Recent developments in single quantumwell lasers allow switching with total energy (including electronic) less than a picojoule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00698652
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