一阶平行波导激光器中有效折射率与阈值损耗的关系。（实例以宽为100，背景折射率为3.2，周期为0.5，入射波长为1）-First Order effective refractive index waveguide laser parallel relationship with the threshold value loss. (Example 100 in width, a refractive index of 3.2 the background, a period of 0.5, incident wavelength of 1)