抄録
A polarization-reversed optical device has been attracting much attention as a next generation device due to its desinability and flexibility. Quasi-phase-matched (QPM) wavelength converters using polarization-reversed structures are reviewed with the focus on materials' progress. We here introduce a low-coercive-field material, stoichiometric LiTaO3, suitable for large aperture QPM devices, and apply it to optical parametric oscillation (OPO). Polarization reversal in electric-field poling is characterized and 35 mm-long QPM OPO devices are demonstrated, while wafer quality is improved. The slope efficiency and the tuning range are reported in wavelength conversion to midinfrared region.
