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  • 1
    Electronic Resource
    Electronic Resource
    Bistability of a CO2 laser with SF6 intracavity as an absorber: Transient effects (1981)
    Springer
    Applied physics 24 (1981), S. 45-48 
    Details
    ISSN: 1432-0630
    Keywords: 42.55 ; 42.65 ; 64
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We investigated time-dependent effects related to the bistable operation of a CO2 laser with an intracavity nonlinear absorber (SF6). The response of the system to small perturbations was sensitively dependent on the operating laser line [P(12)→P(30)] of the 10.6 μm band. The narrow bistable region forP(12), due to a very narrow hysteresis loop, can be effectively utilized for optical switching, because of its pronounced sensitivity to variations in operational parameters. The maximum admissable beam blocking time (intracavity) for spontaneous return to lasing was measured forP(16), for a range of absorber pressures. This τm is related to the relaxation time of the upper level in the absorber.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00900396
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  • 2
    Electronic Resource
    Electronic Resource
    Temperature distribution in a film heated with a laser spot: Theory and measurement (1992)
    Springer
    Applied physics 54 (1992), S. 334-339 
    Details
    ISSN: 1432-0630
    Keywords: 07.20.−n ; 0.7.62+s ; 44.50.+f
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract For the measurement of the thermal capacity and the thermal conductivity of films, the thermal excitation of the sample is commonly performed by the absorption of light. This results in a spatial and temporal temperature distribution within the film. With a variety of methods static or dynamic temperature recordings are performed. Two problems with these methods are discussed, the calculation of the temperature distribution in the film and the measurement of the mean surface temperature of the film. An analytical solution of the heat conduction problem for a cylindrical geometry with any radial distribution of the absorbed light is given. Resistive bolometers are introduced for the measurement of the mean surface temperature of the film within a circular area. Experiments with a 25 μm thick PVDF film give excellent agreement with the theoretical calculations within the modulation frequency range 10−3 Hz to 103 Hz, thus allowing a determination of various thermal parameters of the investigated film.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324197
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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