| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric field detecting optical apparatus for achieving high sensitivity and cost efficiency by using a plurality of high-performance compact electro-optical crystals. SOLUTION: Laser beam emitted from a laser diode 21 is made incident on two serially connected electro-optical elements 23a and 23b via a collimator lens 33 and a first wavelength plate 35, and polarized and changed by an electric field to be combined. The laser beam polarized and changed by the electric field is made incident on a polarized beam splitter 39 after its polarization state is regulated by a second wavelength plate 37, separated into P-waves and S-waves by the polarized beam splitter 39, condensed by first and second condensing lenses 41a and 41b, and converted into electric signals by first and second photodiodes 43a and 43b. COPYRIGHT: (C)2004,JPO
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