LUMINESCENCE IN POTENTIAL FLUORIDE GLASS LASERS
Identifieur interne : 000088 ( Hal/Checkpoint ); précédent : 000087; suivant : 000089LUMINESCENCE IN POTENTIAL FLUORIDE GLASS LASERS
Auteurs : C. J RgensenSource :
Abstract
Fluoride glasses of the zirconium barium lanthanide type (invented Rennes, 1975) and lead gallium zinc (or manganese) type (invented Le Mans, 1979) show luminescence of lanthanide J-Levels situated at least 2000 cm-1 above the closest lower level (this limit is a few times larger in most other materials). Not only is the non-radiative de-excitation as weak as incrystalline LaF3 (studied by Weber) but energy transfer between neodymium and ytterbium (III), or from manganese (II), and to some extent from chromium (III), to luminescent J-levels of neodymium (III), erbium(III) and thulium (III) is highly efficient even at low concentrations. One advantage for laser applications is that the lowest quartet state of manganese (II) has a life-time 10 to 15 milliseconds (like in many phosphate glasses and crystalline compounds) allowing energy transfer, extending by huge factors the average life-time of the emitting J-levels. Though the terawatt lasers (Livermore, California, 1978) inducing deuterium-tritium fusion are silicate glass containing neodymium (III), fluoride glasses should be preferable for many purposes. The evaluation of laser parameters from small-scale experimentation is feasible.
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DOI: 10.1051/jphyscol:19877106
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<front><div type="abstract" xml:lang="en">Fluoride glasses of the zirconium barium lanthanide type (invented Rennes, 1975) and lead gallium zinc (or manganese) type (invented Le Mans, 1979) show luminescence of lanthanide J-Levels situated at least 2000 cm-1 above the closest lower level (this limit is a few times larger in most other materials). Not only is the non-radiative de-excitation as weak as incrystalline LaF3 (studied by Weber) but energy transfer between neodymium and ytterbium (III), or from manganese (II), and to some extent from chromium (III), to luminescent J-levels of neodymium (III), erbium(III) and thulium (III) is highly efficient even at low concentrations. One advantage for laser applications is that the lowest quartet state of manganese (II) has a life-time 10 to 15 milliseconds (like in many phosphate glasses and crystalline compounds) allowing energy transfer, extending by huge factors the average life-time of the emitting J-levels. Though the terawatt lasers (Livermore, California, 1978) inducing deuterium-tritium fusion are silicate glass containing neodymium (III), fluoride glasses should be preferable for many purposes. The evaluation of laser parameters from small-scale experimentation is feasible.</div>
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<abstract xml:lang="en">Fluoride glasses of the zirconium barium lanthanide type (invented Rennes, 1975) and lead gallium zinc (or manganese) type (invented Le Mans, 1979) show luminescence of lanthanide J-Levels situated at least 2000 cm-1 above the closest lower level (this limit is a few times larger in most other materials). Not only is the non-radiative de-excitation as weak as incrystalline LaF3 (studied by Weber) but energy transfer between neodymium and ytterbium (III), or from manganese (II), and to some extent from chromium (III), to luminescent J-levels of neodymium (III), erbium(III) and thulium (III) is highly efficient even at low concentrations. One advantage for laser applications is that the lowest quartet state of manganese (II) has a life-time 10 to 15 milliseconds (like in many phosphate glasses and crystalline compounds) allowing energy transfer, extending by huge factors the average life-time of the emitting J-levels. Though the terawatt lasers (Livermore, California, 1978) inducing deuterium-tritium fusion are silicate glass containing neodymium (III), fluoride glasses should be preferable for many purposes. The evaluation of laser parameters from small-scale experimentation is feasible.</abstract>
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