Quasi-phase matching facilitates the phase matching of any parametric interaction by setting an appropriately modulated period. We propose a dual-periodic structure that is used in the construction of a frequency-conversion device. For example, we have designed and fabricated such a dual-periodic structure in a LiTaO<sub>3</sub> crystal. Using a fundamental source at 1.064 μm, we obtained ultraviolet radiation at 355 nm and green radiation at 532 nm simultaneously by frequency tripling and frequency doubling the fundamental source. Theoretically, this idea can be further extended to the design of a multiperiodic structure for achievement of more quasi-phase-matched processes in a single optical superlattice.
© 2002 Optical Society of America
Zhao-Wei Liu, Yan Du, Jun Liao, Shi-Ning Zhu, Yong-Yuan Zhu, Yi-Qiang Qin, Hui-Tian Wang, Jing-Liang He, Chao Zhang, and Nai-Ben Ming, "Engineering of a dual-periodic optical superlattice used in a coupled optical parametric interaction," J. Opt. Soc. Am. B 19, 1676-1684 (2002)