Abstract
Direct and indirect transition energies near the optical absorption band edge for lithium niobate crystals doped with zinc at several concentrations have been obtained. These energy values are larger than those corresponding to undoped lithium niobate even when zinc concentration is above the optical damage threshold value. For any zinc concentration, 4.0eV was measured for direct transition energy and a range of 3.8–3.9eV was determined for indirect transition energy; whereas 3.8 and 3.6eV were obtained, respectively, for the corresponding values of pure lithium niobate. In addition, phonon and Urbach energies were also calculated where these values are lesser than those of pure lithium niobate. Both behaviors remain unchanged regardless of whether the zinc concentration is above or below the optical damage critical value. Substitution of only lithium vacancies and antisite defects by zinc atoms for any concentration of doping may explain the results.
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