## Abstract

We investigate second-harmonic generation in a nonlinear photonic crystal having radial quasi-periodic order and continuous rotational symmetry. This device enables us to simultaneously phase match different nonlinear interactions in any arbitrary direction of propagation. We have fabricated such a crystal by electric field poling of a magnesium-doped stoichiometric $\mathrm{Li}\mathrm{Ta}{\mathrm{O}}_{3}$ and demonstrated frequency doubling of two different pump wavelengths at three different angles. Fourier coefficients were 10 times higher than that of a lattice-based multidirectional frequency doubler.

© 2010 Optical Society of America

Full Article | PDF Article**Related Articles**

Ariel Bruner, David Eger, Moshe B. Oron, Pinhas Blau, Moti Katz, and Shlomo Ruschin

Opt. Lett. **28**(3) 194-196 (2003)

Guo-Ding Xu, Tie-Wei Ren, Yue-Hua Wang, Yong-Yuan Zhu, Shi-Ning Zhu, and Nai-Ben Ming

J. Opt. Soc. Am. B **20**(2) 360-365 (2003)

V. Z. Kolev, M. W. Duering, and B. Luther-Davies

Opt. Lett. **31**(13) 2033-2035 (2006)