Ultraviolet laser-induced photovoltaic effects in miscut ferroelectric LiNbO3 single crystals

doi:10.1088/1674-1056/19/7/077801

Abstract This paper investigates the photovoltaic properties of miscut LiNbO₃ single crystal with different thicknesses under irradiation of a 248 nm ultraviolet laser pulse with 20 ns duration without an applied bias. Nanosecond photovoltaic response is observed and faster rise time is obtained in thinner samples. In accord with the 248 nm laser duration, the full width at half maximum of the photovoltaic signals keeps a constant of ～20 ns. With decrease of the crystal thickness, the photovoltaic sensitivity was improved rapidly at first and then decreased, and the maximum photovoltage occurred at 0.38 mm-thick single crystal. The present results demonstrate that decreasing the LiNbO₃ single crystal thickness can obtain faster response time and improve the photovoltaic sensitivity.

Keywords: photovoltaic effect LiNbO₃ single crystal photodetector

Accepted manuscript online:

PACS:	72.40.+w	(Photoconduction and photovoltaic effects)
	77.84.Dy
	61.80.Ba	(Ultraviolet, visible, and infrared radiation effects (including laser radiation))
	61.82.Ms	(Insulators)

Fund: Project supported by the Program for New Century Excellent Talents in University of Ministry of Education of China (Grant No. NCET-08-0841), the National Natural Science Foundation of China (Grant Nos. 60778034 and 60877038), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 200804250006), and Beijng Natural Science Foundation (Grant No. 4082026).

Cite this article:

Li Xiao-Ming(李小明), Wang Fang(王芳), Zhao Kun(赵昆), and Zhao Song-Qing(赵嵩卿) Ultraviolet laser-induced photovoltaic effects in miscut ferroelectric LiNbO₃ single crystals 2010 Chin. Phys. B 19 077801

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Ultraviolet laser-induced photovoltaic effects in miscut ferroelectric LiNbO3 single crystals

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Ultraviolet laser-induced photovoltaic effects in miscut ferroelectric LiNbO₃ single crystals