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  • 2000-2004  (1)
  • 1970-1974  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic transitions and electrical transport in lanthanum strontium manganite: Effects of substitutions and high pressure (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 641-643 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The observation of a substitution-induced ferromagnetic order (Tc=200 K) is reported in antiferromagnetic La0.9Sr0.1MnO3 (TN=130 K) when 0.05 of La is replaced by yttrium. Important results of ferromagnetic resonance (FMR) and high-pressure transport studies are as follows. (i) Data on FMR linewidth and resistivity provide evidence for the presence of microscopic magnetic inhomogeneities, possibly La0.9Sr0.1MnO3. (ii) For zero external pressure, a resistivity peak at 130 K due to intergrain tunneling, a secondary peak close to Tc, and magnetoresistance (MR) on the order of 30% are observed. (iii) At high pressures, the resistivity peaks shift to higher temperatures at the rate of 24–26 K/GPa and MR values decrease. (iv) An internal pressure of 3 GPa due to Y substitution is inferred from high-pressure transport studies. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1388872
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Single longitudinal mode selection of high power actively Q-switched lasers (1972)
    Springer
    Optical and quantum electronics 4 (1972), S. 249-256 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A Pockels cell Q-switch has been operated in a manner analogous to a saturable absorber by initially keeping the cell partly open for the first 1000 or so double passes and then opening it completely at a pre-set resonator power. This then allows simple and reliable selection of a single longitudinal mode. A detailed discussion is given of the design considerations which lead to the correct choice of mode-selecting device. With three different devices, a TEM00 mode Nd:CaWO4 laser has produced 400 kW pulses in a single longitudinal mode with a shot-to-shot frequency stability of ∼ 0.01 cm−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02334395
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A two-step Q-switching technique for producing high power in a single longitudinal mode (1971)
    Springer
    Optical and quantum electronics 3 (1971), S. 163-169 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract An electro-optic Q-switch has been opened in two steps to allow slow pulse build-up giving, in conjunction with a resonant reflector, a high degree of mode selection in a way analogous to the use of saturable absorbers. Using this technique, a flash pumped Nd∶CaWO4 laser has produced reliable operation in a single longitudinal and transverse mode with an output power of 250 kW.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01419332
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    Paper (German National Licenses)
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