Abstract
Red, green, and blue, the three primary colors, are essential for laser-based color displays that take advantage of the high brightness, spectral purity and extremely large depth of focus of laser sources. There remains a problem as how to generate laser radiation in these colors in a single compact laser system in order to reduce cost, size and to obtain potential integration. Recently many attempts have been made towards this goal. In the as-grown crystals of LiNbO3 and SBN, the domain structures are formed spontaneously during the crystal growth process, resulting in very low conversion efficiency. Our study showed that with a careful design of the domain engineering, efficient RGB light generateon can be realized by coupled quasi-phase matching method. A brief review will be given in this field.
