通过考虑腔中的自发拉曼散射,提出一种新的绝缘体上硅(sOI)波导拉曼激光器物理模型.仿真结果表明该模型能较好地描述其小信号输出特性,实现对该类激光器的快速分析、设计与优化.利用模型对基于多种SOI波导的拉曼激光器进行分析,结果表明室温下只有采用拥有较大拉曼系数、较小线性损耗和较短有效载流子寿命的SOI波导才能使拉曼激光器达到阈值.提出采用优化SOI波导截面几何尺寸的方法来降低有效载流子寿命,进而提高整体拉曼增益.结果显示该方法可大幅提高SOI波导拉曼激光器的输出功率和能量转换效率.
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