Longitudinal electrooptical effect in oblique sections of lithium niobate

A calculation is given of the longitudinal electrooptical effect in oblique-cutplates of lithium niobate. The dependence of the half-wave voltage on the angle between the direction of the incident beam and the optic axis of a crystal is derived. The calculated value of the half-wave voltage lies within the limits 2.3–2.5 kV and is in agreement with the experimental results.