Extended Data Table 1 | Electromechanical and electro-optical properties of [001]-oriented PMN-28PT crystals via a.c.- and
d.c.-poling
To measure γcL⁎, both the applied electric field and the light beam are along the [001] direction. To measure coefficients γ 33 ⁎ and γ 13 ⁎, the applied electric field is along the [001] direction, and the
light beam is along the [110] direction. Note: it is difficult to obtain accurate electro-optical coefficients for d.c.-poled samples owing to the strong light scattering by the high density of
ferroelectric domain walls. The errors indicate the s.d. of the corresponding data (more than five samples/data points are used for each measurement).