Abstract
Single-crystal films of lithium tantalate ( LiTaO3) have been grown on sapphire substrates (001), (110) and (012) by pulsed laser deposition. Surface acoustic wave (SAW) and optical properties of these films have been investigated. The refractive indices of a (012) LiTaO3 film are n e=2.1712 and n0=2.1651 at 632.8 nm. The SAW velocities of propagation (V s), the temperature coefficients of the center frequency (TCF) and the electro-mechanical coupling coefficients (k2) of the films have been measured, and theoretical calculations of V s and k2 have been done. Experimental V s and k2 coincide with calculated ones. Theoretical calculations show that LiTaO3 films deposited by pulsed laser deposition are superior materials for high frequency SAW devices.
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