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  • 1995-1999  (9)
  • 1985-1989  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 5929-5935 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A systematic investigation is presented of the polarized optical absorption of the Nd3+ ion in LiNbO3 and LiNbO3(MgO) crystals. Energy levels of Nd3+ are identified and labeled by appropriate crystal quantum numbers μ=1/2 or μ=3/2, in agreement with C3 local symmetry. The anisotropic Judd–Ofelt theory is applied to estimate spectroscopic parameters relevant for laser applications (radiative lifetimes and branching ratios from the 4F3/2 laser state). Fluorescence lifetimes are also determined to estimate the quantum efficiency from the 4F3/2 state: η=0.6 for LiNbO3:Nd and η=0.5 for LiNbO3(MgO):Nd. The effect of MgO codoping in the energy levels as well as in the spectroscopic parameters of the Nd3+ ion is evaluated and discussed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 2722-2724 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report efficient generation of continuous wave laser radiation in the nonlinear LaBGeO5:Nd3+ crystal around 1.3 μm. The 4F3/2→4I13/2 laser channel of Nd3+ ions in this crystal leads to efficient generation of laser radiation at 1314 nm (π polarization) and at 1386 nm (σ polarization). Under resonant pumping with a Ti:sapphire laser at 800 nm in the GaAlAs laser diode emission spectral region, an absorbed power threshold of 26 mW is obtained for 1% output coupling. A slope efficiency of 40% is obtained for an output coupling of 3%. Visible red laser radiation at 657 nm is obtained by self-frequency doubling in a type I phase matched crystal. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 593-595 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Samples of Er3+ doped bulk periodically poled lithium niobate have been grown by the Czochralski method. The efficiency, tuning and thermal tolerances of infrared to green second harmonic generation have been measured, showing good accordance with a 4%–5% dispersion in the domain period length. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 2517-2519 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The nonlinear properties relevant to second harmonic generation in LaBGeO5:Nd3+ are reported. This work focuses on the infrared region of the spectrum leading to blue-green laser radiation by self-frequency doubling, but covers a wide spectral range useful for other lanthanide Ln3+ rare-earth doping ions. Phase matching conditions, walk-off angle, and thermo-optic tuning sensitivity for second harmonic generation are reported. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 3735-3737 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The lattice location of three rare-earth ions (Pr3+, Ho3+, Yb3+) in LiNbO3 is investigated using Rutherford backscattering spectrometry/channeling techniques. All of them are found to occupy the Li+ octahedron but shifted from the Li+ regular position by different amounts (−0.45 A(ring) for Pr3+, −0.38 A(ring) for Ho3+, and −0.3 A(ring) for Yb3+) as previously reported for other rare-earth ions. The amount of displacement is directly related to the variation of the ionic radius of the rare-earth ion, oppositely to transition metal ions which are not shifted. A simple model based on electronic configuration is given to account for this behavior. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 1788-1790 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on continuous-wave red laser radiation at 669 nm from a self-frequency-doubled laser of YAl3(BO3)4:Nd3+ operating at a fundamental wavelength of 1338 nm in the 4F3/2→4I13/2 laser channel of Nd3+ ion. Main laser characteristics at the fundamental wavelength are investigated as well as second harmonic generation properties. In nonoptimal preliminary experiments, 1 mW of red radiation is obtained for 900 mW pump power from a Ti:sapphire laser. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 3659-3661 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Sum-frequency mixing in neodymium-doped YAl3(BO3)4 of its fundamental laser line at 1062 nm and the pump light from a tunable Ti:sapphire laser has been used to generate blue radiation from 435 to 465 nm in an end-pumped configuration. In nonoptimal preliminary experiments 22 μW at 458 nm was obtained out of 200 mW absorbed power at 807 nm. Nd:YAB, therefore, emerges as a promising laser material for diode-pumped solid-state lasers in the blue spectral region. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 531-533 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This letter reports continuous wave laser emission at 524 nm from a self-frequency-doubled infrared laser of LaBGeO5:Nd3+ operating at a fundamental wavelength of 1048 nm. Resonant pumping in the spectral region around 800 nm for laser diode pumping is investigated and optical losses are estimated. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 325-327 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Laser radiation corresponding to the three fundamental colors (red, green, and blue) has been generated from the same Nd:YAl3(BO3)4 crystal, operating on a fundamental laser wavelength of 1338 nm in an end-pumping configuration. Continuous wave generation was obtained by pumping with a tunable Ti: sapphire laser. Red (669 nm) has been obtained by self-frequency doubling of the fundamental laser line. Green (505 nm) and blue (481 nm) have been obtained by self-sum-frequency mixing of the fundamental laser radiation at 1338 nm and the pump radiation (807 nm for green and 755 nm for blue). © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 6197-6200 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The absorption and luminescence data reported in this paper definitely confirm that the precipitates formed during high-temperature aging of Pb-doped NaCl are PbCl2 microcrystals. A detailed comparison of the optical spectra of the precipitates and free PbCl2 is presented. The absorption and luminescence spectra are essentially similar in both cases, although the splitted structure of the prominent exciton band has now been resolved for the first time in the absorption spectrum of the precipitates. The splitting has been interpreted in terms of the noncubic crystal field effect on the 3P1 excited level of Pb+2 which is considered as a cationic exciton. The gap energy Eg and the binding energy εb of the exciton have also been determined (Eg=4.86 eV, εb=0.18 eV). The same UV and blue luminescence bands, as well as a thermally induced interconversion among them, have now been observed for the precipitates as well as for free PbCl2. This luminescence behavior, not previously understood, has been explained in terms of two coexisting AT and Ax minima in the adiabatic energy surface of the 3P1 level of a Pb+2 localized exciton (Fukuda's model).
    Type of Medium: Electronic Resource
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