| 摘要 |
PURPOSE:To efficiently obtain second harmonic light by changing the coupling coefft. of a 1st optical waveguide and a 2nd optical waveguide in the period satisfying a specific relation. CONSTITUTION:A mask consisting of a sputtered film of SiO2 is formed excluding the parts where 1st and 2nd optical waveguides 1 and 2 are formed. This mask is immersed for several tens minutes to several hours into the melt of heated benzoic acid (H6H5COOH) to form the optical waveguide by making the refractive index higher than in the circumferential refractive index part. The width and depth of the respective optical waveguides, the width of slots 3, and other detailed conditions are so set as to satisfy equation I in this case. In the equation, beta2(2omega) is the propagation constant of the second harmonic wave for the 2nd optical waveguide 2; beta1(omega) is the propagation constant of the basic wave for the 1st optical waveguide 1; m is a positive odd number; A is a period. The power density of the basic wave light increases and the conversion efficiency improves. |
