Second-order optical nonlinearity of 10-µm-thick periodically poled LiNbO₃ films

Abstract

We report on the fabrication and ${\chi }^{\left(2\right)}$ measurements of thin $\sim 10‐\mathit{\mu }\mathrm{m}$-thick films of periodically poled ${\mathrm{LiNbO}}_3$, obtained by crystal ion slicing. The $d_{33}$ optical coefficient in the films is probed by sum-frequency generation with a short-pulse laser source at 1550 nm and compared with that of the bulk. Efficient, room-temperature $\mathrm{TM}\left(\omega ,m=0\right)$-to-$\mathrm{TM}\left(\omega +\omega ,m=0\right)$ mode conversion is obtained in the films. These measurements show that domain periodicity is preserved during ion implantation and that the thin films have bulklike nonlinearity and material dispersion.

© 2000 Optical Society of America

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