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用射线法导出了两段式半导体激光器的端面输出谱。该结果既适用于两段式双稳激光器，也适用于简单的外腔式激光器。于是，我们首次用一个统一的式子对这两种看起来颇为不同的器件的某些特性进行了研究。
The end face output spectrum of two-stage semiconductor laser is derived by ray method. The result is valid for both two-stage bistable lasers and for simple external-cavity lasers. So, for the first time, we used a uniform formula to examine some of the features of these two seemingly different devices.