Abstract
Piezoelectric strain under a large de electric field, D33 is directly measured by using an electrically controllable diffraction (ECD) grating. The ECD grating consists of a lead lanthanum zirconate titanate piezoelectric ceramic with 65 pairs of grooves having 40‐μm width and 80‐μm period on its surface. The operational principle for the diffraction grating and the procedure for obtaining D33 are described. D33 is measured experimentally with a He‐Ne 3.39‐μm laser, yielding a value of 5.9 × 10−9 m/V under a dc electric field of 1 kV/mm. This value is discussed along with the piezoelectric constant d33 calculated from a conventional electrical resonant method.
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