Abstract
A lithium-rich vapor transport equilibration technique was used to increase the Li/Nb ratio in single crystal LiNbO3 thin film at low temperature (below 600 °C). The extraordinary refractive index ne of the Li-compensated thin film was measured and found to be 2.1983 at 632.8 nm using the prism coupling method, while the ne of the congruent LiNbO3 was 2.2024. The lattice parameter (cr) of Li-compensated LiNbO3 thin film was determined to be 13.8604 A using high-resolution x-ray (HRXRD) ω - 2θ scan, which was between the values of congruent LiNbO3 (13.8650 A) and stoichiometric LiNbO3 (13.8562 A). The Raman spectra showed significant differences in the relative intensity and the FWHM of Raman lines between the Li-compensated thin film and congruent thin film.
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