The first laser-diode-based external electro-optic (EO) sampling using a GaAs probe tip is described. This tip is a longitudional electric field sensor, being therefore immune from optical crosstalk. The minimum detectable voltage is 16mV/√(Hz). The EO sampling is compared with that of a conventional electrical sampling oscilloscope, and the two are shown to be in excellent agreement.
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Shinagawa et al. (1990) studied this question.
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