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  • 1
    Electronic Resource
    Electronic Resource
    Refractive indices of lithium niobate as a function of wavelength and composition (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 3472-3476 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An interferometric method is applied to determine the refractive indices of lithium niobate single crystals over a wide wavelength and composition range. A generalized two term Sellmeier equation is proposed that describes the refractive indices as a function of wavelength and stoichiometry. On the basis of this generalized Sellmeier equation the parameters of nearly all optical characterization methods for LiNbO3 can be calculated. By means of a Kramers–Kronig analysis the shift in the UV absorption edge and the change in the extraordinary refractive index with the composition can be referred to each other. Excellent agreement is found with the respective experimental values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352951
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  • 2
    Electronic Resource
    Electronic Resource
    Phase matching for second harmonic generation in KNbO3:Ta crystals with Nd:YAG- and GaAs-laser wavelengths (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 3426-3428 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Noncritical phase-matched second harmonic generation was measured in optically biaxial KNb1−xTaxO3 mixed crystals in the orthorhombic phase. For Nd:YAG-(1064 nm) the coefficient d31 of the tensor of the nonlinear susceptibility was applied, while for the GaAs-laser (905 nm) the coefficient d32 was used. For both laser wavelengths the phase-matching temperature decreases with increasing Ta-concentration. Noncritical phase-matching at room temperature can be reached with the GaAs-laser for a Ta concentration of ≈9%. The corresponding value for the Nd:YAG laser is ≈14%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348525
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  • 3
    Electronic Resource
    Electronic Resource
    Optical second-harmonic generation in lead formate (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 22-24 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The optical properties of lead formate crystals are investigated, especially those affecting the usage for optical second-harmonic generation. The refractive indexes and the optical absorption are measured in the near-ultraviolet, visible, and near-infrared spectral regions. The data show that the material is suitable for the efficient generation of blue light when pumped with near-infrared laser wavelengths. Phase matching conditions for this application of lead formate are determined both experimentally and by a numerical evaluation of the index data. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371820
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  • 4
    Electronic Resource
    Electronic Resource
    Second order nonlinear optical properties of In-doped lithium niobate (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 849-854 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Second order nonlinear optical properties of In-doped lithium niobate crystals have been quantitatively studied from the chemical bond viewpoint. The results show that the second order nonlinear optical response of In-doped lithium niobate crystals at 1079 nm decreases remarkably with increasing In concentration in the crystal. This approximately linear composition-property correlation in In-doped lithium niobate crystals is quantitatively expressed in the current work. Furthermore, the different influences of Mg, Zn, and In dopants, respectively, on the nonlinear susceptibility of lithium niobate single crystals are also compared in the present work. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1336563
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  • 5
    Electronic Resource
    Electronic Resource
    Induced noncolinear frequency doubling: A new characterization technique for electro-optic crystals (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 2209-2212 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Induced noncolinear frequency doubling (INCFD) is presented as a new characterization technique for electro-optic crystals. Using the interaction of two noncolinear laser beams for the generation of second harmonic light, the method yields a three-dimensional spatial resolution. First experimental results of INCFD measurements on composition gradients in lithium niobate and on the spatial orientations of 90o-domain walls in potassium niobate are shown. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361184
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  • 6
    Electronic Resource
    Electronic Resource
    Composition dependence of the second-harmonic phase-matching temperature in LiNbO3 (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 34-35 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Phase-matching temperatures for 90° phase matching of Nd:YAG laser light have been measured in LiNbO3 crystals with different Li/Nb ratios. Their melt and solid composition had been determined chemically with an accuracy of about 0.2%. Our results contrast to earlier work, no linear dependence of the phase-matching temperature versus the Li/Nb ratio was found. The measured dependence shows that the phase-matching temperature can be used as an excellent probe for the composition of LiNbO3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105216
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  • 7
    Electronic Resource
    Electronic Resource
    Theoretical studies of nonlinear optical properties of compounds K4Ln2(CO3)3F4 (Ln=Pr, Nd, Sm, Eu, Gd) (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 2849-2852 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: K4Ln2(CO3)3F4 (Ln=Pr, Nd, Sm, Eu, Gd) is a special type of frequency doubling compound, whose crystal structure exhibits a scarcity of fluorine ions. This leads to two different coordination polyhedrons in the general position of K(2) atoms: [K(2)O6F(1)2F(2)] and [K(21)O6F(1)2] in a 2/1 ratio. The chemical bonding structures of all constituent atoms of the compound K4Gd2(CO3)3F4 (KGCOF) are comprehensively studied; moreover, the relationship between the chemical bonding structure and the nonlinear optical (NLO) properties is investigated from the chemical bond viewpoint. The theoretical prediction of the NLO tensor coefficient d11 of KGCOF is in agreement with experimental observation. Theoretical analyses show that the nonlinearity of this crystal type mainly originates from K–O bonds. In addition, the correlation between the NLO tensor d11 and the refractive index n0 of KGCOF is discussed. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372267
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  • 8
    Electronic Resource
    Electronic Resource
    Spatially resolved second-harmonic-generation investigations of proton-induced refractive-index changes in LiNbO3 (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 1253-1256 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Doping profiles generated by electric-field-assisted proton diffusion in LiNbO3 bulk material are investigated, spatially resolved by absorption and by second-harmonic-generation measurements. The results allow a direct correlation of the refractive-index changes with the local proton density. It is shown that protons are the only mobile ions under the experimental conditions applied (600 °C, 100 V/cm), whereas lithium ions do not move under these conditions. Similar results were obtained for samples doped with deuterium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343018
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  • 9
    Electronic Resource
    Electronic Resource
    Interferometric measurement of refractive indices (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 652-653 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A simple method for the measurement of the refractive indices of parallel plate samples is described that uses the shift of the interference pattern when rotating the sample in one arm of a Mach–Zehnder interferometer. The theoretical fringe pattern shift is calculated and the accuracy of the method is derived. A typical accuracy of about 10−4 can be achieved at low refractive indices. The method is especially useful when—because of other reasons—the samples are provided as plates or when prisms are difficult to fabricate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139853
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  • 10
    Electronic Resource
    Electronic Resource
    Determination of homogeneity of pure and doped lithium niobate by second harmonic generation temperature phase matching (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 5158-5162 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Employing a comprehensive Sellmeier equation for the refractive indices, we derive calibration curves to be used for the homogeneity characterization of lithium niobate. Applying the calculated results, quantitative homogeneity parameters can be derived from temperature tuning curves for noncritical second harmonic generation, which are usually measured to state the composition of the material. The calibration method is of interest and presently is being used for pure as well as Mg-, Zn-, and In-doped crystals in the whole concentration regime. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.368766
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