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Crystal Research and Technology |
Cryst. Res. Technol. 40,
352 (2005) - Abstract -
Melting behavior and growth of colquiriite laser crystals
D. Klimm, R. Uecker, and P. Reiche
Institute for Crystal Growth, Max-Born-Str. 2, 12489 Berlin, Germany
| Keywords | laser crystals, fluorides, hydrolysis, phase diagram |
| PACS | 42.55.Rz, 81.30.Dz, 81.10.–h |
| DOI | 10.1002/crat.200410350 |
Colquiriite-type crystals like LiCaAlF6, LiSrAlF6, LiCaGaF6, and LiSrGaF6 are interesting host crystals for Cr3+ or Ce3+ laser ion doping. Although the Ca compounds show interesting optical properties, the growth of these crystals is difficult due to incongruent melting. LiCaGaF6 crystallizes with CaF2 deficiency and melts incongruently at 710-720°C. Hydrolysis with traces of moisture is critical for all fluorides. AlF3 and GaF3 have the highest sensitivity among the main components of the colquiriites. Hydrolysis can only be slightly suppressed by hydrogen fluoride. Elementary fluorine or reactive gases as carbon tetrafluoride are more effective by several orders of magnitude.
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