Abstract
Two-dimensional images of the 180° ferroelectric domain structure can be successfully obtained by using our recently developed SHG microscope/1/,/2/. The image is obtained as a result of the interference between second harmonic waves from a domain and those from homogeneously poled part. This is a quite general method for optical observation of 180° ferroelectric domains of any kind of crystal. As examples, second harmonic images are shown for BaTiO3, LiTaO3, LiNbO3 and V-LiNbO3. In particular, the successful observation of a periodically inverted antiparallel domain in LiTaO3 verified that the SHG microscopy provides a unique nondestructive method for characterizing the periodicity of inverted domains in quasi-phase matching devices. The two-dimensional Maker fringe pattern can be easily obtained by the SHG microscope with a wedge-shaped specimen. This method is also useful to evaluate the poling state of ferroelectric crystals.
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