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A frequency doubling electro-optic modulation system for Pockels effect measurements: Application in LiNbO3

N. G. Theofanous, M. Aillerie, M. D. Fontana, G. E. Alexakis
1997 Review of Scientific Instruments  
A novel system is presented which is capable of measuring with high accuracy the linear ͑Pockels͒ electro-optic effect by means of a new dynamic ͑ac͒ method. This method is based on the observation of the photodetected output obtained from a Senarmont-type ellipsometric system with an ac ͑modulating͒ voltage being applied onto the electro-optic sample under test. This observation is made on a high sensitivity oscilloscope and allows us to determine accurately the null point of the system by
more » ... f the system by locating the position of the analyzer that produces in the output a characteristic and abrupt doubling of the ͑modulation͒ frequency. By locating this frequency doubling position without and with electric field one can finally determine the corresponding electro-optic coefficients. Theoretical analysis and considerations of practical interest are presented in the article and show that the system in question can ensure reduced errors and increased sensitivity. Also, experimental evidence in support of the expected performance is obtained by implementing and applying the system for the measurement of the composite electro-optic coefficient r c of LiNbO 3 for various temperatures in the range of 17-20°C.
doi:10.1063/1.1148109 fatcat:qupcu2eqyfajfm4wqx3l2b46c4