Abstract

One of the ways in the development of the compact blue-green lasers is frequency doubling of near-IR semiconductor laser in nonlinear crystal, in particular, using quasi-phase matching (QPM) in waveguides. QPM was realized by the periodic domain inversion in the several ferroelectric crystals, such as LiNb_O LiTaO₃ and KTP [1-3]. Various domain inversion techniques were proposed to get efficient SHG in the waveguide geometry, but basically for LiNbO3 and LiTaO3 crystals. Only one method based on the Ba²⁺ + Rb⁺ ion exchange through the periodical mask was applied for KTP [3].

© 1993 Optical Society of America