Generalized Dispersion Relations for Waveguide Frequency Doubler,

The optimum design of an efficient waveguide frequency doubler depends on many parameters such as the refractive indices of the guide n2w and cladding n1w materials, their respective dispersions from w to 2w w 2 PiLambda, The thickness of the waveguide t, and the fundamental wavelength Lambda. Furthermore, it is desirable that the waveguide be noncritically phase matched with respect to a random thickness fluctuations which arise from the fabrication process, b variations of fundamental wavelength due to characteristics of the laser source and c changes in ambient temperature.