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  • 1965-1969  (4)
  • 1960-1964
  • 1950-1954
  • 1967  (4)
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  • 1965-1969  (4)
  • 1960-1964
  • 1950-1954
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  • 1
    Electronic Resource
    Electronic Resource
    Untersuchung der Differenzfrequenzen zwischen zwei Lasern (1967)
    Springer
    The European physical journal 199 (1967), S. 349-359 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The frequency stability of He-Ne-Lasers was investigated by heterodyning two free running laser oscillators. Measurements were performed in a laser device of high mechanical stability protected against acoustical noise. For single mode operation the stability and spectral purity of the laserfrequency was found to be well defined by the constancy and bandwidth of the beat frequencies. In multimode operation beat frequencies were found which were nearly independent from the oscillator cavity length. They were produced by inevitable nonlinearities in the electronic equipment. For pointing out this effect more clearly, an additional nonlinear element was introduced into the electronic circuit. The additional nonlinearity was found to produce the same beatfrequencies as observed before, but with higher amplitudes. Presence of these second order beats may lead to misinterpretation of the frequency stability. From the minimum obtained beat frequency of 200 c/s in single mode operation it was concluded that a minimum laser bandwidth of smaller than 200 c/s was realized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01332394
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Dynamische Eigenschaften von Laser-Oszillatoren. II (1967)
    Springer
    The European physical journal 206 (1967), S. 457-464 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The dynamic behaviour of the laser frequencies induced by non-linearities of the active medium is investigated theoretically for the representative case of three simultaneously oscillating modes. Occurance of combination tones is explained byLamb's theory. Experimental values of the spacings between combination tones and laserfrequencies are in agreement with theory. Inserting experimental relaxation times intoLamb's theory the experimental intensities of the combination tones were also found to be in agreement with the theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01325701
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Dynamische Eigenschaften von Laser-Oszillatoren. I (1967)
    Springer
    The European physical journal 206 (1967), S. 446-456 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The dynamic behavior of the laserfrequencies induced by non-linearities of the active medium is investigated experimentally. Measurements were performed in a laser device of high mechanical stability protected against acoustical noise. Results are discussed in the representative 3-mode-case. Combination tones, as predicted byLamb, were directly observed by a coupled optical amplifier with 5 · 103 cps band width. All observed frequencies are classified in a simple energy level diagram containing only the differences between the original laserfrequencies. Simultaneously performed beat frequency measurements agree with the optically determined spacing between combination tones and original laserfrequencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01325700
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Selbstentzündung organischer Substanzen an Isoliermaterial (1967)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 39 (1967), S. 667-671 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Die Selbstentzündung organischer Substanzen an Isoliermaterial ist häufig eine Ursache für Brände in chemischen und erdölverarbeitenden Anlagen. In einer Laboratoriumsapparatur wurde das Verhalten mehrerer organischer Verbindungen in verschiedenen Isoliermaterialien bei erhöhten Temperaturen untersucht und die Bedingungen für eine Selbstentzündung diskutiert. Aus den Versuchsergebnissen können Maßnahmen angegeben werden, die die Möglichkeit von Bränden einschränken.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330391106
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    Paper (German National Licenses)
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