2 May 2014 Revisiting the physics of mode locking in lasers
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Abstract
We present a way to describe mode locking through a master equation, derived from the laser Maxwell-Bloch equations, which take into account coherence in light-gain interaction. Our derivation shows that gain evolution on the fast time scale of the laser pulses must be considered, unlike in Haus master equation. A key point in the derivation is to use an improved adiabatic elimination of the medium polarization which leads to the appearance of the fast evolution of gain. Numerical simulations with parameters suitable for a semiconductor laser show marked differences with respect to Haus master equation in the shape, height and width of the pulses. These effects, which are related to the fast varying part of the gain, are more pronounced the longer is the cavity.
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Auro M. Perego, Auro M. Perego, Franco Prati, Franco Prati, Germán J. de Valcárcel, Germán J. de Valcárcel, } "Revisiting the physics of mode locking in lasers", Proc. SPIE 9134, Semiconductor Lasers and Laser Dynamics VI, 91340D (2 May 2014); doi: 10.1117/12.2051671; https://doi.org/10.1117/12.2051671
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