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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 9334-9337 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dark traces induced by high-power laser radiation in LiNbO3:Mg and LiNbO3:Zn are found to be reduced by annealing the crystals in an O2 atmosphere. Most of the decrease of the second-harmonic generation efficiency η for 1064–532 nm conversion due to dark traces can be recovered in heat-treated crystals. The transmission loss spectra ΔT(λ) of dark traces show a complex absorption band ranging from 365 nm to near infrared, which can be decomposed into three main peaks at 3.1, 2.5, and 1.6 eV. Maximum transmission loss due to dark traces after 1200 shots with an input power density of 18 MW/cm2 is 17% and 25% for as-grown LiNbO3:Zn and LiNbO3:Mg crystals respectively, and it is reduced to 4.6% and 3.8% respectively for heat-treated crystals. © 1996 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 66 (1995), S. 280-281 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Highly indium-doped lithium niobate crystals have been grown. It was found that a LiNbO3:In (5 mol %) crystal had a similar high resistance to photorefraction as a LiNbO3:Zn (7.5 mol %) crystal. The result of x-ray fluorescence showed that the doped concentration of In in LiNbO3:In (5 mol % in the melt) exceeds the concentration threshold of trivalant elements (3.0 mol % in the crystal). The LiNbO3:In (5 mol %) crystal is another doped LiNbO3 crystal with high resistance to light-induced refractive index damage. © 1995 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 64 (1994), S. 2622-2624 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The light-induced grating erasure technique has been used to measure the photorefractive properties of LiNbO3:Zn. The results show that the photoinduced hole carriers increase when Zn content exceeds the concentration threshold. The charge relocation rate at high Zn doping content increases significantly, while the concentration of the photoinduced charge carriers has no obvious change.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 51 (1990), S. 394-397 
    ISSN: 1432-0630
    Keywords: 78.50 Ec ; 72.40+w
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The absorption spectra, photoconductivities and photovoltaic currents of LiNbO3:Fe crystals with different Mg doping levels and Li/Nb ratios in the oxidized state have been investigated at room temperature. The Fe2+ ions in LiNbO3:Mg:Fe with Mg content above a critical value are more easily oxidized than in crystals with Mg content below a critical value. The photoconductivity of LiNbO3:Mg:Fe crystals with Mg content above a critical value is one order of magnitude higher than those with Mg content below a critical value, however, the photovoltaic current of the former is one order of magnitude lower than the latter. The differences are postulated to be due to different sites of Fe in these two classes of crystals.
    Type of Medium: Electronic Resource
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