We have demonstrated, for the first time to our knowledge, periodic poling of a 2-mm-thick near-stoichiometric LiTaO<sub>3</sub> substrate and its operation in a nanosecond optical parametric oscillator. Because the coercive field of stoichiometric LiTaO<sub>3</sub> is ∼2 kV/mm , which is approximately one tenth that of the conventional congruent field, periodic poling of thicker stoichiometric substrates was successfully performed by means of an electric-field poling process at room temperature. The performance of a parametric oscillator with a 1-mm-thick sample was compared with that of the oscillator with the periodically poled congruent oscillator. The stoichiometric device exhibited better performance.
© 2000 Optical Society of America
(160.2260) Materials : Ferroelectrics
(160.4330) Materials : Nonlinear optical materials
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4400) Nonlinear optics : Nonlinear optics, materials
(190.4970) Nonlinear optics : Parametric oscillators and amplifiers
Takaaki Hatanaka, Koichiro Nakamura, Tetsuo Taniuchi, Hiromasa Ito, Yasunori Furukawa, and Kenji Kitamura, "Quasi-phase-matched optical parametric oscillation with periodically poled stoichiometric LiTaO3," Opt. Lett. 25, 651-653 (2000)