title: On determination of sign of the piezo-optic coefficients using torsion method.
abstract: We have shown that a high-accuracy torsion method recently developed by the authors for measuring piezo-optic coefficients allows determining not only the absolute value of the coefficients but also their sign. The techniques and experimental procedures used for determination of the sign are described in detail and proven based on studies of α-BaB2O4 and LiNbO3 crystals. The piezo-optic coefficients are determined for both crystals, and a combination of the corresponding photoelastic coefficients is determined for the case of α-BaB2O4 crystals.
authors.affiliation: Institute of Physical Optics, 23 Dragomanov Street, 79005 Lviv, Ukraine.
authors.forename: Yurij
authors.initials: Y
authors.lastname: Vasylkiv
authors.forename: Viktoriya
authors.initials: V
authors.lastname: Savaryn
authors.forename: Ihor
authors.initials: I
authors.lastname: Smaga
authors.forename: Ihor
authors.initials: I
authors.lastname: Skab
authors.forename: Rostyslav
authors.initials: R
authors.lastname: Vlokh