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  • 1
    Electronic Resource
    Electronic Resource
    Spectroscopic and laser properties of Nd3+ in LaSc3(BO3)4 host (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 4997-5001 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spectroscopic and laser properties have been characterized for Nd3+ in LaSc3(BO3)4. The Judd–Ofelt analysis has been applied to the measured room temperature absorption spectrum to determine the radiative decay rates and branching ratios of Nd3+ transitions from the 4F3/2 metastable state to the 4IJ lower-lying manifolds. The parameters Ω2, Ω4, and Ω6 are larger than those reported for Nd3+ in other laser host crystals. The value of Ω4/Ω6 is approximately 3.0 times larger than that of Nd3+ in yttrium–aluminum–garnet (YAG) and about 1.4 times larger than that of Nd3+ in the β phase of LaSc3(BO3) reported recently. The measured room temperature fluorescence lifetime of the 4F3/2→4I11/2 transition is 150 μs, while the Judd–Ofelt analysis predicts a radiative lifetime for the 4F3/2 state to be 249 μs, resulting in the fluorescence quantum efficiency of 60%. The emission cross sections of the 4F3/2→4I11/2 and 4F3/2→4I13/2 intermanifold transitions have been also determined at room temperature. Finally, these results are compared with those of the standard laser material Nd3+:YAG. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1408588
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  • 2
    Electronic Resource
    Electronic Resource
    Characterization of spectroscopic and laser properties of Pr3+ in Sr5(PO4)3F crystal (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 911-915 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spectroscopic and laser properties have been characterized for Pr3+ incorporated into Sr5(PO4)3F crystal belonging to the apatite structure family. The standard Judd–Ofelt analysis has been applied to the measured optical absorption intensities to determine the radiative decay rates, branching ratios, and emission cross sections of principal intermanifold transitions of Pr3+ from the 1D2 and 3P0 states to the lower-lying manifolds in the visible region. The measured room temperature fluorescence lifetimes of the 1D2→3H4 (594 nm) and 3P0→3F2 (625 nm) transition are 325 and 105 μs, respectively, while the Judd–Ofelt analysis predicts the radiative lifetimes for the 1D2 and 3P0 states to be 822 and 116 μs, respectively. The room temperature emission cross sections of the 1D2→3H4 and 3P0→3F2 intermanifold transitions have been also determined to be 0.54×10−20 and 4.15×10−20 cm2, respectively. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1427433
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Incomplete projection algorithms for solving the convex feasibility problem (1998)
    Springer
    Numerical algorithms 18 (1998), S. 177-193 
    Details
    ISSN: 1572-9265
    Keywords: convex feasibility ; projections ; multi-processing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract We present a general scheme for solving the convex feasibility problem and prove its convergence under mild conditions. Unlike previous schemes no exact projections are required. Moreover, we also introduce an acceleration factor, which we denote as the λ factor, that seems to play a fundamental role to improve the quality of convergence. Numerical tests on systems of linear inequalities randomly generated give impressive results in a multi-processing environment. The speedup is superlinear in some cases. New acceleration techniques are proposed, but no tests are reported here. As a by-product we obtain the rather surprising result that the relaxation factor, usually confined to the interval (0,2), gives better convergence results for values outside this interval.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019165330848
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    Paper (German National Licenses)
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