Further comments on t.i.r. deflector/modulator performance

T.I.R. modulator/deflector far-field order intensities are shown to agree with prediction for LiNbO3 xy-cut devices, and a `blazing¿ effect, controlled by crystal orientation, is suggested. Zero-order extinction ratios were between 40:1 and 140:1, and seemed optical-finish limited. Misalignment of a 0.1 mm pitch interdigitated electrode device by ±5° halved the device sensitivity, indicating the possibility of use with uncollimated light. White-light (incoherent) operation and optimisation prospects are reported.