Hill K O, Watanabe A
Appl Opt. 1975 Apr 1;14(4):950-61. doi: 10.1364/AO.14.000950.
Gain saturation is treated by formulating a model that accounts for the dependence of gain on irradiance level in distributed-feedback lasers. Solutions of the coupled-mode equations of the model are obtained numerically and are presented for both overcoupled and undercoupled laser structures (KL in the 10(-13)-10 range). Parasitic losses that are distributed uniformly within the structure are found to influence the output power characteristics of distributed-feedback lasers. Also the optimum coupling strength that results in the most efficient conversion of pump power to useful laser output is determined. The optimum coupling strength for any distributed-feedback laser is dependent on the magnitude of the parasitic losses and on the required output-power level.
通过建立一个考虑分布式反馈激光器中增益与辐照水平相关性的模型来处理增益饱和问题。对该模型的耦合模方程进行了数值求解，并给出了过耦合和欠耦合激光结构（KL在10^(-13)-10范围内）的解。发现结构内均匀分布的寄生损耗会影响分布式反馈激光器的输出功率特性。此外，还确定了能使泵浦功率最有效地转换为有用激光输出的最佳耦合强度。任何分布式反馈激光器的最佳耦合强度都取决于寄生损耗的大小和所需的输出功率水平。
