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- W2374722894 abstract "By using a multi-hole-crucible and a furnace designed by ourselves,the CaF2 crystals were grown by Bridgman-Stockbarger method under the vacuum condition.Under the growing condition of the vacuum below 3×10-3 Pa,the axial gradient in growing zone about 1.8~2.5 ℃/mm,radial gradient below 0.5 ℃/mm,growing velocity of 3~4 mm/h and pre-annealing temperature descending velocity below 20 ℃/h, 7 ingots of CaF2 crystals with size of Φ57 mm×190 mm were grown in single process by melting,scavenging,homogenizing,controlling velocity and pre-annealing.The results show that the grown crystals with a wide transparent band have a good performance from 190 nm in ultra-violet to 9 000 nm in infra-red.The transmissivity is about 81% at 190 nm and 83% at 9 000 nm.The rate of mono-crystal is about 80%.The dislocation is about 30/mm2.The proposed equipment and technology are suited to batch production of CaF2 crystals." @default.
- W2374722894 created "2016-06-24" @default.
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- W2374722894 date "2007-01-01" @default.
- W2374722894 modified "2023-09-28" @default.
- W2374722894 title "Calcium fluoride crystal growth with multi-hole-crucible" @default.
- W2374722894 hasPublicationYear "2007" @default.
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