The optical gain is thoroughly introduced and the elements of optical gain calculated in AlGaAs-GaAs single quantum well.
The derivations of every elements were shown and in the case of some parameters, the proofs are existed. The program was used on Fortran 77 and IMSL routine itself serving. The main program and the sub programs algorithms were introduced.
The data of (100) growth substrate quantum well laser and of (111) growth substrate quantum well laser were shown to many figures. And with these data figures, it turned out that (111) growth substrate quantum well laser gain is higher than (100) growth substrate quantum well laser gain. Another results were explained.
The linewidth enhancement factor α was studied. The data of (100) growth substrate and (111) growth substrate were fully compared with the gain advantage.