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Chinese Optics Letters

Chinese Optics Letters

| PUBLISHED MONTHLY BY CHINESE LASER PRESS AND DISTRIBUTED BY OSA

  • Editor: Zhizhan Xu
  • Vol. 10, Iss. 4 — Apr. 1, 2012
  • pp: 042301–

Growth and optical properties of Cr3+-doped CdWO4 single crystals

Yuntao Wan, Haoyang Hu, Haiping Xia, Yuepin Zhang, Haochuan Jiang, and Hongbing Chen  »View Author Affiliations


Chinese Optics Letters, Vol. 10, Issue 4, pp. 042301- (2012)


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Abstract

A high-quality Cr3+:CdWO4 single crystal at a size of approximately Φ 25 × 80 mm is grown using the Bridgman method with CdO, WO3, and Cr2O3 as raw materials and their molar ratio of 100:100:0.5. The temperature gradient of solid-liquid interface at growth is approximately 50 °C/cm and the growth rate is 0.05 mm/h. The X-ray diffraction (XRD), absorption, excitation, and emission spectra of different parts of the as-grown and O2-annealed crystals are investigated. Two strong broad optical absorption bands of about 472 and 708 nm are observed, and they are associated with the transitions 4A24T1 and 4A24T2. The weak 4T22E transition (the R-line) at 632 nm is also observed. The crystal-field parameter Dq and the Racah parameters B and C are estimated to be 1 412.4, 776.8, and 3 427.6 cm-1, respectively, according to the absorption spectra and crystal-splitting theory. A broadband fluorescence at about 1 000 nm due to 4T2→4A2 transition is produced by exciting the samples at 675 nm. After being annealed in an O2 atmosphere, the crystals become more transparent, while the effective light absorption of Cr3+ ions is evidently enhanced and the emission intensity is also strengthened due to the reduction of oxygen vacancies in the CdWO4 crystal after annealing.

© 2012 Chinese Optics Letters

OCIS Codes
(260.1180) Physical optics : Crystal optics
(230.5298) Optical devices : Photonic crystals

ToC Category:
Optical Devices

Citation
Yuntao Wan, Haoyang Hu, Haiping Xia, Yuepin Zhang, Haochuan Jiang, and Hongbing Chen, "Growth and optical properties of Cr3+-doped CdWO4 single crystals," Chin. Opt. Lett. 10, 042301- (2012)
http://www.opticsinfobase.org/col/abstract.cfm?URI=col-10-4-042301

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