Experimental determination of the electro-optic coefficient r(13) of a lithium niobate crystal is described. The crystal in this experiment is z cut, used as a substrate for a Fabry-Perot etalon. I computed the r(13) coefficient from the measured voltage tuning curve of the Fabry-Perot etalon. It is found that,the measured value of r(13) is lower than most of the reported values in literature. (C) 2003 Optical Society of America. [References: 8]
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