Photorefractive properties of paraelectric potassium lithium tantalate niobate crystal doped with iron

✍ Scribed by Hao Tian; Zhongxiang Zhou; Dewei Gong; Haifeng Wang; Yongyuan Jiang; Chunfeng Hou

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 316 KB
• Volume: 281
• Category: Article
• ISSN: 0030-4018
• DOI: 10.1016/j.optcom.2007.11.060

✦ Synopsis

We report the successful growth of paraelectric potassium lithium tantalate niobate (KLTN) single crystal doped with iron. Detailed investigations have been made on the photorefractive properties of the as-grown crystal. The key parameters such as space-charge field, grating response time, photorefractive sensitivity and sign of the dominant charge carrier were obtained by two-wave mixing technique. 1.7 mm thick sample exhibits a high diffraction efficiency of 78% at the external field of 3.3 kV/cm and a sensitivity of 1.49 Â 10 À10 E 0 cm 2 /J. The two-wave mixing gain coefficient increases linearly with external field, and reaches a large value of 19.4 cm À1 at 4 kV/cm. Based on experimental results, iron is an effective dopant to KLTN which shows high diffraction efficiency and two-wave mixing gain coefficient.