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Chinese Optics Letters

Chinese Optics Letters

| PUBLISHED MONTHLY BY CHINESE LASER PRESS AND DISTRIBUTED BY OSA

  • Vol. 8, Iss. 11 — Nov. 1, 2010
  • pp: 1071–1074

Bridgman growth of LiYF4 single crystal in nonvacuum atmosphere

Qishu Fang, Hongbing Chen, Fang Xu, Sujing Wang, Zhe Liang, and Chengyong Jiang  »View Author Affiliations


Chinese Optics Letters, Vol. 8, Issue 11, pp. 1071-1074 (2010)


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Abstract

Using LiF and YF3 as starting materials, we prepare feed material from fluorides according to the molar ratio of LiF:YF3 = 51.5:48.5. The anhydrous LiYF4 polycrystalline material is synthesized via the fluoridation process with a dried HF flow at elevated temperature. By charging the feed material and adding a small amount of active carbon powder in a sealed platinum crucible, the crystal can be grown via the vertical Bridgman method in a nonvacuum atmosphere. This is possible because the oxidization and volatilization of the melt is avoided. Using optimum conditions, that is, a growth rate of 0.5-0.6 mm/h and a temperature gradient of 25-30 ºC/cm across the solid-liquid interface under a furnace temperature of 920-930 ºC, the colorless crystal LiYF4 with the size of φ25 x 50 (mm) is successfully grown. The optical transmittance of the crystal is as high as 85% above the absorption edge at 190 nm. The induced absorption bands are observed below 700 nm in the transmission spectrum after the crystal is subjected to a high dose of γ-ray irradiation.

© 2010 Chinese Optics Letters

OCIS Codes
(160.0160) Materials : Materials
(160.4670) Materials : Optical materials

Citation
Qishu Fang, Hongbing Chen, Fang Xu, Sujing Wang, Zhe Liang, and Chengyong Jiang, "Bridgman growth of LiYF4 single crystal in nonvacuum atmosphere," Chin. Opt. Lett. 8, 1071-1074 (2010)
http://www.opticsinfobase.org/col/abstract.cfm?URI=col-8-11-1071


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