CASTECH INC.

Fuzhou, China

CASTECH INC.

Fuzhou, China

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Chen X.-B.,Beijing Normal University | Zhou G.,Beijing Normal University | Zhou Y.-F.,Peking University | Wu Z.-L.,Beijing Normal University | And 9 more authors.
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2015

The present manuscript researches the near infrared quantum cutting luminescence phenomena of Yb3+ ion in YVO4 crystal matrix. The luminescence spectra, excitation spectra and fluorescence lifetimes were measured. It was found that the excitation of YVO4 crystal matrix energy band by 322.0 nm light can result in the effective secondary cooperative energy transfer of Yb3+ ion from the YVO4 crystal matrix. It results in the intense 985.5 nm 2F5/2 → 2F7/2 near infrared quantum cutting luminescence of Yb3+ ion. Meanwhile, the 430.0 nm luminescence intensity of YVO4 crystal matrix decreases greatly. From the experimental measurements, it was found that the lifetime of 430.0 nm fluorescence of (A) Yb(1.5):YVO4 crystal is τA=3.785 s and that of (B) YVO4 crystal is τB=22.72 s. It was found also that the theoretical efficiency up limit of quantum cutting of (A) Yb(1.5):YVO4 crystal is about η1.5%Yb=183.3%. ©, 2014, Science Press. All right reserved.


Chen J.-B.,CAS Fujian Institute of Research on the Structure of Matter | Chen J.-B.,CASTECH INC. | Lin Y.,CAS Fujian Institute of Research on the Structure of Matter | Lin Y.,CASTECH INC. | And 3 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2014

YVO4+Nd:YVO4 composite crystals were successfully grown by Czochralski method. Compared with the diffusion bonding crystals, the composite crystals could avoid bonding surface treatment and bonding surface polishing, and without bubble and crack defects. The crystals are composited firmly, and saved some process, and have excellent optical performance. In this paper, the method was introduced.


Chen J.-B.,CAS Fujian Institute of Research on the Structure of Matter | Chen J.-B.,CASTECH INC. | Lin Y.,CAS Fujian Institute of Research on the Structure of Matter | Lin Y.,CASTECH INC. | And 4 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2014

Using raw materials synthesized by liquid-phase method, high-quality TGG crystal with size of 35-40 mm diameter, 40-50 mm long was successfully grown by automatic Czochralski method in iridium crucible. The crystal is straight of appearance, smooth and transparent of interior, no spiral texture, no interface inversion. The crystal has the advantages of no scattering, no core and no crack with testing by He-Ne laser. The X-ray powder diffraction testing show that the crystal and the remaining material are TGG, there is no other chemical composition. It has advanced optical properties of low absorption value, high damage threshold.

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