Investigation of Single Crystal Silicates for Blue Tunable Lasers.
Quarterly progress rept. no. 1, 1 Sep-30 Nov 85,
LITTON SYSTEMS INC MORRIS PLAINS NJ AIRTRON DIV
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The single crystal growth of rare earth silicates was investigated for the purpose of tunable laser hosts. Silicates of the type R2SiO5, where R La, Gd, Y, Lu, were prepared from stoichiometric melts and doped with Ce3 activators. Seed crystals were obtained from crystallized melt sections or by growth on an iridium wire. These seeds were utilized in standard Czochralski type growth to obtain larger single crystals. Cathodoluminescence experiments on both powders and single crystals showed wavelength shifts with different rare earth ions. The Gd, Y, and mixed crystals of Gd-Y silicates gave good bright emission with Ce3. The emission is broad band and covers the wavelength range of 370-525nm. The peak emission can be centered near 450-460nm by other compositions. Larger single crystals for laser hosts are under development. Keywords Tunable lasers Rare earth silicates Czochralski growth Laser crystals.
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