Crystal Research and Technology
Cryst. Res. Technol. 34 (1999) 403 - Abstract -

HAI-RUI XIA, JIAN-HUA ZOU, HUAN-CHU CHEN, DA-LIANG SUN

Department of Physics and State Key Laboratory of Crystal Materials, Shandong University, Jinan, People’s Republic of China

Photorefractive Properties of Co-Doped Potassium Sodium Strontium Barium Niobate Crystals

The transmissivity and the results of two-beam coupling and self-pumped phase conjugation (SPPC) experiments on Co-doped potassium sodium strontium barium niobate (KNSBN) single crystals are reported. The Co ions doped into KNSBN can form a deep energy level near 2.25 eV. The two-beam coupling gain coefficients of the Co-doped KNSBN are nearly 20 cm-1 at 2q » 370 for the transmission photorefractive index grating and larger than 29.2 cm-1 for the reflecting photorefractive index grating. A striking single-beam asymmetric transmission was observed. The maximum SPPC reflectivity is larger than 70% at q = 49.70 for an intensity W = 77 mW, which is the largest value measured in the family of KNSBN crystals.

Keywords: PACS numbers: 71.70.Ch, 78.20.Wc


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