Abstract
Investigation of the nonlinear gain in semiconductor lasers is important since those properties play important roles in certain laser characteristics such as modulation dynamics,1 laser amplification,2 and phase conjugate wave generation.3 However, such nonlinear gain properties have not been discussed for quantum well (QW) lasers so far. We investigate theoretically the nonlinear gain effect in QW lasers. As a result, it is found that the nonlinear gain is enhanced by the quantum confinement of carriers. In addition, it is pointed out that the differential gain gJ is also reduced by the nonlinear gain effect, which significantly affects the modulation dynamics of semiconductor lasers under high photon density conditions. It should be emphasized that not only the damping rate but also the resonant frequency is affected by nonlinear gain effects.
© 1989 Optical Society of America
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