2 . introducing several classical circuit models concerning ld such as below ith ld double heterostructure ld and multimode ld . it can make a guide to consequent qw - ld ' s circuit model by acquainting some principles methods and techniques of structuring model 介绍了几个有特色的比较典型的半导体激光器的定模工作，它们是阈值以下的半导体激光器、双异质结半导体激光器及多模半导体激光器，主要了解激光器定模的原理、方法及一些处理技巧，对后面量子阱激光器的定模起一个向导作用。
