摘要
本文用微扰论分析了各种BH激光器中波导界面不平整性引起的散射和模式转换过程.计算了各阶导波模式的散射损耗随界面不平整参数、折射率差和到达界面光能的变化.结果表明高阶模式一般都比低阶模式的散射损耗高得多,特别是对依靠增益差难以抑制的A类高阶模式有明显的抑制作用,因而是一种有效的选模机制.
Scattering and mode conversion due to imperfect boundaries in BH and mass-transportedBH semiconductor lasers are analyzed theoretically by perturbation method.The influences ofimperfect boundary parameters,refractive index difference and the mode power arrived at theboundaries on the scattering loss of different guiding modes are calculated.It is shown thatthe scattering loss of higher mode is generally much higher than that of lower mode and hasprominent effect on higher mode suppression, especially on suppressing higher modes of classA, thus it is a remarkable effective mode selecting mechanism.
基金
国家自然科学基金
关键词
半导体
激光器
散射损耗
模式选择
Semiconductor laser
Mode selection
Scattering loss
