Importance

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Abstract

A first electrode is partially contacted with a domain to be polarization-inverted 2 on one plate face of a nonlinear optical crystal substrate 1, a second electrode is contacted with the other plate face of the substrate, and a polarization inversion voltage is applied between the both electrodes. At this time, the electrode is so formed that the contact area of the first electrode 3 with the plate face satisfies particular conditions, and the domain to be polarization-inverted is entirely or partially polarization-inverted by the application of a polarization inversion voltage. The aforementioned particular conditions are that each contact area 3 is dot-like so that plural contact areas 3 can be present independently within individual domains to be polarization-inverted 2, and individual dot-like contact areas have an area of 0.00785 .mu.m .sup.2-7850 .mu.m.sup.2 and a shape included in a circle having a diameter of 100 .mu.m. As a result, a polarization inverted crystal having high quality can be obtained more easily.

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First Claim