PRODUCTION OF OPTICAL WAVELENGTH CONVERSION ELEMENT

摘要

PURPOSE:To form deep periodic polarization inversion layers by utilizing slab- shaped polarization inversion layers. CONSTITUTION:After a proton exchange layer 5 is formed by a proton exchange on an LiTaO3 substrate 1, the proton exchange layer is subjected to a heat treatment for 15 seconds at 550 deg.C to form the slab-shaped polarization inversion layers 7 within the LiTaO3 substrate 1. The thick proton exchange layers 8 are then formed right under the slits on the LiTaO3 substrate 1 formed with patterns consisting of Ta6 by executing the proton exchange for 30 minutes at 260 deg.C and thereafter, the exchange layers are heat treated for one minute at 550 deg.C. The polarization inversion layers 3 are formed in such a manner. These layers connect to the slab-shaped polarization inversion layers 7. The polarization inversion layers 3 are subjected to the proton exchange to form optical waveguides 2. The wavelength conversion element formed with the polarization inversion layers 3 and the optical waveguides 2 in the nonlinear optical crystal is obtd. in this way.