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  • 2000-2004  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Conversion of red light into green light in LiTaO3:Ho (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 6078-6080 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Intense green luminescence associated with the 5S2–5I8 transition of Ho3+ in holmium doped LiTaO3 crystals has been excited at room temperature and at 15 K by a 647.1 nm line of a krypton ion laser. Based upon the analysis of excited states relaxation dynamics and of the rise of upconverted luminescence it is concluded that the mechanism involved is an excited state absorption from the long lived 5I7 level. Efficient single wavelength excitation of upconverted luminescence in LiTaO3:Ho is due to the advantageous coincidence of transition energies of the ground and excited state absorptions. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1286065
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Anti-Stokes emission in undoped YVO4 (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 1183-1185 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single crystal of nominally undoped YVO4 exhibits a broad-band emission centered at 450 nm when excited at any wavelength between 620–440 nm with short pulses delivered by an optical parametric oscillator. The broad-band emission has been assigned to the transition from the lowest energy excited states 3T1, 3T2 to the ground 1A1 state of the VO43−, whereas the excitation mechanism is supposed to be an excited state absorption from a hitherto unidentified intermediate state. This state is likely to be related with V4+ and/or V3+ ions whose presence in YVO4 is generally recognized. The material may have a potential as a tunable source of blue radiation provided a way is found to increase the ground state absorption. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1451991
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of temperature on luminescence of terbium ions in LiNbO3 (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 3610-3611 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single crystals of LiNbO3 doped with terbium were grown by the Czochralski method and their optical properties were examined. It has been found that, in contrast to isostructural LiTaO3:Tb, the terbium ions in LiNbO3 exhibit intense luminescence at low temperatures only, up to about 150 K. At this temperature, a luminescence quenching mechanism with activation energy of 0.22 eV is switched on. As a consequence, the luminescence of LiNbO3:Tb is reduced to a negligible level at room temperature. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1376660
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  • 4
    Electronic Resource
    Electronic Resource
    Conversion of infrared radiation into red emission in YVO4:Yb,Ho (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 3026-3028 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Upon continuous wave excitation around 1 μm, a YVO4 crystal codoped with ytterbium and holmium exhibits intense red emission originating in the 5F5 level and considerably weaker green emission originating in the 5S2 level of Ho3+. The ratio of the red to green emission intensities is 17:1 at 300 K. The dependence of the intensity of both emissions on the pump power is nearly the same but the mechanisms determined on the basis of short pulse excitation are found to be different. It is concluded that the green emission is excited by two consecutive energy transfers from Yb3+ to Ho3+, whereas excited state absorption is involved in the excitation of red emission. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1415767
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    Paper (German National Licenses)
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