Lithium tantalate SAW substrate minimal diffraction cuts

A simple physical theory is presented for thed escription of surface acoustic wave (SAW) orientations on anisotropic crystalline substrates having minimal diffraction spreading. The resultant conditions for thee xistence of these minimal diffraction cuts( MW) agree with those derived from formal diffraction theory. These techniques are illustrated by the theoretical and experimendtaisl covery of two new MDC orientations on LiTaO3, having diffraction retarded by approximately a factor of 20 over isotropic materials. Euler angies for the cut having superior spurious mode suppression are λ = 0, γ = 167.1 167.1±0.4, θ = 90°.