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  • 1
    Electronic Resource
    Electronic Resource
    The luminescence efficiency of YAG: Ce phosphors (1980)
    Springer
    Czechoslovak journal of physics 30 (1980), S. 185-192 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The luminescence intensity of Yttrium aluminium garnet activated by the Ce3+ (YAG∶Ce3+) under cathode-ray excitation depends on the preparation method and content of some dopants. Samples containing Fe, Pt, Ir or some colour centre, respectively, show relatively low luminescence. The maximum luminescence intensity was obtained with the Czochralski method grown single crystals in 98% Ar+2% H2 atmosphere which were sensitized by oxygen annealing followed by treatment at 1500 °C in molybdenum container using a wet hydrogen atmosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01595683
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  • 2
    Electronic Resource
    Electronic Resource
    Absorption background and laser properties of YAP:Nd (1990)
    Springer
    Czechoslovak journal of physics 40 (1990), S. 99-108 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract YAP:Nd laser crystals suffer to a greater extent than YAG:Nd from colour centres formation. Stable brownish-yellow or green colourations are evoked by non-oxidizing treatment at high (〉1500 °C) temperature. The former colouration may be attributed to holes in the oxygen neighbourhood of Y3+ at Al sites, the latter to the F+ centres. Brownish-red colouration of less stability is induced by optical pumping of Nd3+ containing crystals. It may be attributed to holes in oxygen neighbourhood of Nd3+. Dependences of the colourations on the preparation methods are described. YAP:Nd,Zr laser rods, oxygen annealing of which was followed by medium (1100–1400 °C) temperature treatment in vacuum or hydrogen showed no anomalous colouration and extremely low losses at Nd3+ emission wavelength independent of pumping power. Using such rods, an overall efficiency of 2·5% and a slope efficiency of 3·0% in CW lasers were reached.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01598358
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    About the luminescence properties of YAG∶Nd, Ce and YAG∶Nd single crystals and their relation to laser properties (1986)
    Springer
    Czechoslovak journal of physics 36 (1986), S. 1079-1089 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Laser excited luminescence studies of various YAG∶Nd, Ce and YAG:Nd (with an excess of yttrium) single crystals together with a testing of laser properties of rods made from the same crystals have been investigated in this paper. It was observed that laser pulse energies increase with increasing halfwidths of the luminescence spectral bands. This dependence and other observations indicate that local structure changes or Nd3+ nonequivalent centres are present in the studied crystals. Various mechanisms leading to the formation of Nd3+ nonequivalent centres are discussed and it seems that the more probable mechanism is oxygen segregation and diffusion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01597772
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  • 4
    Electronic Resource
    Electronic Resource
    Transient absorption and laser output of YAG : Nd (1981)
    Springer
    Czechoslovak journal of physics 31 (1981), S. 644-651 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract YAG : Nd grown under 98% Ar 2% H2 protective atmosphere free of nitrogen or hydrocarbons showed after UV irradiation broad absorption peaked at ∼1·9×104 cm−1 which disappeared relatively slowly at room temperature. It was more intensive in oxygen treated samples than in those annealed in hydrogsn. Transient absorption suppresses laser output by the increase of absorption at 0·94×104 cm−1 (1064 nm) and, particularly in CW mode, by the anomalous rod deformation. YAG : Nd containing Fe ions (≲2·10−4 wt%) showed no transient absorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01605310
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  • 5
    Electronic Resource
    Electronic Resource
    Growth of YAP in reducing conditions (1988)
    Springer
    Czechoslovak journal of physics 38 (1988), S. 181-187 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Growth of the perfect YAP crystals up to 35 mm in diameter and 185 mm in length is described. The decomposition of the crystal and the iron content were suppressed by using of Ar-He-H2 protective atmosphere and negatively charged electrode above the melt level. The shape of solid-liquid interface is connected with optical homogeneity of the crystals. It may be controlled by the Ar: He ratio. The comparison with the crystals grown in vacuum is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01596494
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  • 6
    Electronic Resource
    Electronic Resource
    Yttrium aluminate crystals for slabs (1990)
    Springer
    Czechoslovak journal of physics 40 (1990), S. 1283-1287 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The methods of growing YAG:Nd crystals with a flat interface and YAP:Nd crystals with a sharp conical interface are described. The form of the interface was controlled by the He and H2O content in the reducing atmosphere composed mainly of Ar and H2 as well as by axial temperature gradient above the melt level. The crystals of 120–180 mm in length were machined to the high-quality slabs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01605057
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Hydroxil and iron ions in YAP: Er laser crystals (1992)
    Springer
    Czechoslovak journal of physics 42 (1992), S. 103-109 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract 4S3/2→4I9/2 (1.663Μm) and4I11/2→4I13/2 (2.731Μm) laser transitions in YAP∶Er were studied using a material containing Fe, hydroxil impurities and other codopants. Iron impurity causes luminescence quenching of both the4S3/2 and4I11/2 levels whereas OH− ions enlarge losses, particularly at 2.731Μm. The effect of iron and hydroxil impurities may be easily diminished by adding Mg2+ ions, whereas the admixture of Ce3+ or Zr4+ brings no positive effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01605161
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  • 8
    Electronic Resource
    Electronic Resource
    Growth and stimulated emission of YAP:Ti (1988)
    Springer
    Czechoslovak journal of physics 38 (1988), S. 237-240 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01596501
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