Abstract
The influence of electron heating and cooling in a semiconductor laser with an intracavity saturable absorber (SLSA) under dc current injection on the intensity profiles of optical pulses and instabilities is analyzed. In this case the most important of electron heating and cooling processes are stimulated emission heating, stimulated absorption cooling and free-carrier absorption heating. It is shown that stimulated emission heating and stimulated absorption cooling cause the emergence of a distinct tail of the optical pulse and complex types of instabilities including chaos. When the effect of free-carrier absorption heating is enhanced, it results in qualitative changes in the pulse shapes and the evolution of the dynamic regimes of SLSA. These changes include the emergence of strongly damped relaxation oscillations inside the pulse and the abrupt transition from the cw operation to the simplest unstable regime.
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