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Erschienen in:
01.04.2013
Measurement of space-charge field in doped LiNbO3 single crystals
Erschienen in: Journal of Electroceramics | Ausgabe 1-2/2013
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Abstract
In order to measure the space-charge field in MgO-doped LiNbO3, we examined the variation of second-harmonic intensity by an external DC electric field and a single beam pump. Intensities of illuminated beam were 3.9 and 7.8 W/cm2. An external DC field was applied in the direction of spontaneous polarization (i.e. c-axis). Generated second-harmonic intensity as a function of DC electric field represented by the function of (cosine)2. Space-charge field formed as a function of the exposure time of a laser beam had a exponential function. In 4 mol% MgO-doped LiNbO3 of 6.8 kV/cm at 3.9 W/cm2, the saturated space-charge field had a minimum value and the relaxation time had a maximum value.