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  • Articles: DFG German National Licenses  (9)
  • 1995-1999  (9)
Source
  • Articles: DFG German National Licenses  (9)
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Absorption spectrum of silver bromide crystals and fibers in the 9–11 μm wavelength range (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 1612-1613 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The absorption spectrum in the 9–11 μm range of both undeformed and plastically deformed AgBr crystals and polycrystalline optical fibers was investigated by tunable laser calorimetry. The observed spectral features are discussed in terms of the crystal defect structure. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363897
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Fiberoptic evanescent wave infrared spectroscopy of gases in liquids (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 2818-2820 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Silver halide optical fibers were used as attenuated total reflection elements for infrared evanescent wave spectroscopy of gases in liquids. The evanescent wave absorption spectra of chlorodifluoromethane (Freon-22) and carbon dioxide gases (CO2) in water were studied and the dependence on vapor pressure of the gas and temperature was investigated. Absorption peaks were easily traced and correlated well with those in the literature. The use of the infrared (IR) fibers in the fiberoptic evanescent wave spectroscopy system bypasses the difficulty of ordinary IR spectroscopy related to the strong IR absorption of most liquid solvents, and provides a flexible, easy, and inexpensive way of determining the presence and concentration of gases in liquids to within about 5% accuracy. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145561
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Transmission of pulsed CO2 laser beams through "opaque" liquids by a cavitation effect (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 2362-2364 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The formation of a stationary cavity by a sequence of CO2 laser pulses was investigated in liquids of different viscosity and surface tension. Decreasing the surface tension of the liquid and increasing its viscosity increases the depth of the cavity and decreases the threshold energy needed for its formation. A theoretical model based on the Bernoulli–Stokes equation was developed. Good agreement between experimental and theoretical results was obtained. A method of reducing thermal damage, involving liquid layer effects during laser cutting of different materials, is proposed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.118874
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Two-bandpass fiber-optic radiometry for monitoring the temperature of photoresist during dry processing (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 2583-2585 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature of a thin photoresist layer on a silicon wafer was measured in situ during dry etching by using a silver halide optical fiber noncontact thermometer. A two-bandpass radiometer was constructed to reduce errors arising from geometrical factors and emissivity changes. Such a system may be used to monitor surface temperatures during dry processing of semiconductors and to prevent overheating that may cause damage, such as cross linking of photoresists. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116191
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Temperature measurements using pulsed photothermal radiometry and silver halide infrared optical fibers (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 1509-1511 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A novel technique for measuring temperature, based on pulsed photothermal radiometry and analysis of the spectral and temperature dependence of Planck's blackbody equation, is described. In this technique a body is irradiated by a laser pulse and its temperature inferred from the time dependence of the emitted infrared signal curve. This technique was used for near ambient temperature measurements using a CO2 laser, an infrared detector, and infrared transmitting silver halide optical fibers. The experimental results are consistent with theory. This technique is independent of changes in emissivity or geometric factors and it will be useful for accurate and fast noncontact temperature measurements. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.118602
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Luminescence method for the study of Nd3+ ions diffusion in AgBr crystals (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 2114-2118 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This study of diffusion of Nd in AgBr is motivated by our interest in the preparation of Nd-doped AgBr crystals that show lasing effects in the near and midinfrared. The doping can be done in several ways. We propose that monitoring the infrared luminescence along the direction of diffusion of activator ions in crystals of AgBr is a sensitive and minimally invasive method of determining the diffusion coefficient, the diffusion enthalpy, and the temperature dependence of these parameters for ions of interest. We have used this technique to study the diffusion of Nd3+ in AgBr crystals. To establish the concentration range in which the luminescence method is useful, the dependence of the luminescence kinetics on the Nd-ion concentration was investigated. The temperature dependence of the diffusion coefficient (D0=1.2×10−5 cm2/s at room temperature), and the diffusion enthalpy (H=0.51 eV) were determined. We found that high values of the diffusion coefficient and low values of the diffusion enthalpy facilitate preparation of high optical quality Nd-doped AgBr crystals. Such crystals are candidates for lasing action. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369511
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of Thermal and Mechanical Treatment on the Luminescence of AgBr Crystals (1996)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 239-241 (Nov. 1996), p. 163-166 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/02/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.239-241.163.pdf
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Fatigue of mixed silver halide polycrystalline optical fibres (1996)
    Springer
    Journal of materials science 31 (1996), S. 5109-5112 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The transmission of CO2 laser radiation by polycrystalline AgCl x Br1−x fibres was measured during cyclic bending of the fibres. These fibres are useful as flexible infrared optical fibres, and it is important to know their fatigue strain limit for applications which require many bending cycles. The investigation was performed in the regime of forced bending vibration. The fibres were found to transmit without significant deterioration after more than 107 cycles. Fatigue strain limit values, based on 107 bending cycles, are in the range of 0.05%–0.30%. These values were found to depend on the composition and to exhibit a maximum for the AgCl0.5Br0.5 composition. This dependence on composition has been explained by a theoretical model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00355912
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    High-cycle fatigue monitoring in AgClxBr1-x fibres using absorption spectroscopy (1997)
    Springer
    Journal of materials science 32 (1997), S. 6453-6457 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The spectral transmittance of mixed silver-halide polycrystalline fibres was measured while they were undergoing repeated bending leading to mechanical fatigue. Microscopic mechanical defects were detected through their influence on the optical losses, without interfering with the deformation. Optical and mechanical lifetimes of the fibres were found to depend on the composition and to be larger for highly-mixed compositions. Scanning electron microscopy observations of fatigued fibres revealed a strong influence of the fibre composition on the fatigue damage. This dependence on the composition was explained using a theoretical model of solid-solution strengthening.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018690606472
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    Paper (German National Licenses)
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