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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
    Optical characterization of a laser dye in a solid state host (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 7739-7744 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The optical properties of C18H16N2O2B2F4H2O, an organic laser dye embedded in solid plastic host, have been characterized for a number of laser wavelengths in the visible region. The index of refraction of the dye in plastic host is measured by the conventional method of minimum deviation at these wavelengths. The inverse adding doubling method based on the diffusion approximation and radiative transport theory have been employed to determine the absorption, scattering, and scattering anisotropy coefficients of the dye in plastic host from the measurements of total diffuse transmittance, total diffuse reflectance, and collimated transmittance using an integrating sphere. The total attenuation coefficients obtained by this method have been compared with those determined by the collimated transmission and from the total attenuation measurement. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1371949
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  • 3
    Electronic Resource
    Electronic Resource
    Spectroscopic properties of Co2+ in related spinels (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 4846-4852 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the absorption and fluorescence spectra of divalent cobalt (Co2+) in a series of related spinels Mg(1−x)CoxAlBOC, where B=2, 4, 6, C=4, 7, 10, and x represents the amount of Co2+ that substitutes for Mg2+ in tetrahedral sites of Td symmetry. The spectra support the assumption that both Mg2+ and Co2+ prefer the tetrahedral cation sites during the growth of these crystalline materials. These observations also support earlier conclusions obtained from crystallographic and thermodynamic studies of the MgO and Al2O3 phase diagram. The observed spectra are analyzed and compared to calculated electronic levels derived from lattice-sum models using crystallographic data determined from the crystals grown in the present studies. Comments are made in relevance to the use of these crystals as saturable absorbers for near infrared Q-switched lasers. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1455153
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Stark effects on the spectra of trivalent praseodymium ions in strontium fluorapatite laser host (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 4688-4692 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An optical characterization of the Stark components of the 1D2 and 3H4 manifolds has been performed using the fluorescence spectra for the 1D2→3H4 transition of Pr3+ in Sr5(PO4)3F laser host at 10 K. The temperature dependencies of the spectral width, position, and shift of the sharp, intense inter-Stark transition of the 623.6 (X2→Y5) nm line within the 1D2→3H4 inter-manifold transition have been also investigated. The linewidth of this transition was found to increase with increasing crystal temperature. Also, the 623.6 nm line was found to shift toward the longer wavelength (redshift) as temperature was increased. The experimental results of the temperature dependent width and shift of this line are explained in light of the Debye model, which invokes phonon-ion interaction in crystalline solids. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1310183
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  • 6
    Electronic Resource
    Electronic Resource
    Comparative evaluation of absorption coefficients of KCl:Eu2+ and CaF2:Eu2+ using a spectrophotometer and an integrating sphere (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 1759-1762 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The absorption coefficients of two crystalline solid-state materials, KCl:Eu2+ and CaF2:Eu2+, are measured by the conventional method using a spectrophotometer. The Kubelka–Munk theory and diffusion approximation are also applied to determine the scattering and absorption coefficients of these samples from the measurements of diffuse transmission and reflection using an integrating sphere. The absorption coefficients obtained from these two different techniques are compared and their discrepancies are discussed in detail. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360965
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  • 7
    Electronic Resource
    Electronic Resource
    Optical characterization of Nd3+:Sr5(VO4)3F (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 5900-5904 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A spectroscopic investigation of Nd3+ in Sr5(VO4)3F has been performed. The Judd–Ofelt (J–O) theory was applied to the polarization-averaged optical-absorption spectra of Nd3+ 4f3 transitions to determine the crystal intensity parameters: Ω2=9.14×10−20 cm2, Ω4=5.92×10−20 cm2, and Ω6=2.03×10−20 cm2. The intensity parameters were then used to determine the emission probabilities of transitions from the Nd3+ 4F3/2 metastable state to the lower lying J manifolds and their corresponding branching ratios, the radiative lifetime (248 μs), and the quantum efficiency (0.93) of the 4F3/2 state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358406
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  • 8
    Electronic Resource
    Electronic Resource
    Temperature dependencies of linewidths, positions, and line shifts of spectral transitions of trivalent neodymium ions in barium magnesium yttrium germanate laser host (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 1195-1199 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The spectral widths, positions, and shifts of the sharp emission lines for the R1→X5 and R2→Y3 inter-Stark transitions within the respective intermanifold transitions of 4F3/2→4I9/2 and 4F3/2→4I11/2 of Nd3+ ions in Ba0.25Mg2.75Y2Ge3O12 laser host have been investigated as a function of temperature. The linewidths of these transitions increased as the temperature of the host crystal was increased. The emission line for the R1→X5 transition shifted toward the shorter wavelength (blue shift), while the emission line for the R2→Y3 transition shifted toward the longer wavelength (red shift) with increasing temperature. The experimental results of the temperature-dependent linewidths and line shifts of these transitions are explained in light of the existing theory of the phonon-ion interaction in crystalline solids. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366815
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  • 9
    Electronic Resource
    Electronic Resource
    Multipulse laser damage of GaAs surfaces (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 3688-3693 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An in-depth study of the single and multiple-pulse laser (10 ns, 10 Hz, and 1064 nm) damage of (100) single-crystal gallium arsenide surfaces is presented. The surface morphologies resulting from both chemical etching and laser-induced damage are discussed. The damage behavior is determined from the damage probability and accumulation curves. The dependence of damage on accumulated incident energy in multipulse experiments is determined and compared with the behavior of other semiconductor and metal surfaces. Finally, Auger electron spectroscopy is employed to measure the elemental depth composition of GaAs wafers using Ar+ ion sputter etching. This technique is used to study the changes in elemental depth profiles caused by the laser-induced damage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339250
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