Abstract
In this thesis, we have demonstrated an optical parametric oscillation with 230-GHz signal linewidth of periodic structure along the pumping direction. In order to fabricate a grating structure onto the nonlinear gain medium such as lithium niobate, we used a dicing machine to cut an optical-grade grating with 60μm and 100μm periods. Here, we call such a device the coupled-microcavity optical parametric oscillation which creates a type of oscillation without reflection mirrors. Meanwhile, the produced waves are known as signal and idler waves. The longer wavelength wave usually diffracts faster and is more likely to be scattered from the grating. Therefore, we designed the idler wave as the operation wavelength for resonance. By using a quasi-phase-matching technique such as periodically poled lithium niobate, we can generate the signal and idler wavelength at 1.6μm and 3.7μm with 1064-μm pumping. Furthermore, in the theoretical simulation, we have combined the coupled-wave theory with distributed feedback optical parametric oscillation theory to discuss the longitudinal mode selectivity and threshold condition. Moreover, to calculate the parametric gain, we modified the coupling coefficient while considering the periodic structure on a flat waveguide and a Gaussian transverse field.