Abstract
Pulsations in semiconductor lasers are frequently observed to occur within a range of injection currents above threshold. A model is proposed to account for the existence of the current range and attributes it to a critical optical power level at which photon induced modulation of optical loss takes place, such as due to the effect of self-focusing or lateral mode deformation. This value is estimated to be <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.36 \times 10^{15}</tex> photons- cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-3</sup> for double heterostructure oxide-striped lasers.
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