Improvement of photorefractive properties in Hf:Fe:LiNbO3 crystals with various [Li]/[Nb] ratios

doi:10.1088/1674-1056/19/9/094209

Abstract Photorefractive properties of Hf:Fe:LiNbO₃ crystals with various [Li]/[Nb] ratios have been investigated at 488 nm wavelength based on the two-wave coupling experiment. High diffraction efficiency and large recording sensitivity are observed and explained. The decrease in Li vacancies is suggested to be the main contributor to the increase in the photoconductivity and subsequently to the induction of the improvement of recording sensitivity. The saturation diffraction efficiency is measured up to 80.2%, and simultaneously the recording sensitivity of 0.91 cm/J is achieved to in the Hf:Fe:LiNbO₃ crystal grown from the melt with the [Li]/[Nb] ratio of 1.20, which is significantly enhanced as compared with those of the Hf:Fe:LiNbO₃ crystal with the [Li]/[Nb] ratio of 0.94 in melt under the same experimental conditions. Experimental results definitely show that increasing the [Li]/[Nb] ratio in crystal is an effective method for Hf:Fe:LiNbO₃ crystal to improve its photorefractive properties.

Keywords: diffraction efficiency recording sensitivity Hf:Fe:LiNbO₃ crystals

Received: 05 January 2010
Revised: 12 March 2010
Accepted manuscript online:

PACS:	4265
	4270
	4280T
	8140T

Fund: Project supported by the Fundamental Research Foundation of Commission of Science Technology, Industry for National Defense of China (Grant No. 2320060089), and National Basic Research and Development Program of China (Grant No. 2007CB3070001) and Program of Excellent Team in Harbin Institute of Technology, China.

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Sun Xiu-Dong(孙秀冬), Shi Hong-Xin(石宏新), Luo Su-Hua(骆素华), Meng Qing-Xin(孟庆鑫), and Jiang Yong-Yuan(姜永远) Improvement of photorefractive properties in Hf:Fe:LiNbO₃ crystals with various [Li]/[Nb] ratios 2010 Chin. Phys. B 19 094209

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Improvement of photorefractive properties in Hf:Fe:LiNbO3 crystals with various [Li]/[Nb] ratios

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Improvement of photorefractive properties in Hf:Fe:LiNbO₃ crystals with various [Li]/[Nb] ratios