Graphene Actively Mode-Locked Lasers

Light-mode condensation in actively-mode-locked lasers.

We show that the formation of pulses in actively mode-locked lasers exhibits in certain conditions a transition of the laser mode system to a light pulse state that is similar to Bose-Einstein condensation (BEC). The study is done in the framework of statistical light-mode dynamics with a mapping between the distribution of the laser eigenmodes to the equilibrium statistical physics of noninter...

Soliton stability conditions in actively mode- locked inhomogeneously broadened lasers

We examine the conditions for soliton stability in actively mode-locked inhomogeneously broadened lasers. Numerical simulation shows that in the small negative group-velocity dispersion (GVD) region, excessive gain filtering prevents the generation of a single stable soliton pulse and that in the large negative GVD region, the free-running spectral components destabilize the soliton pulse as a ...

Locking Bandwidth of Actively Mode-Locked Semiconductor Lasers

The locking bandwidth of an actively mode-locked semiconductor laser is a measure of its tolerance to variations in the input drive frequency. At frequencies outside the locking bandwidth, the output pulses from the laser exhibit large amplitude fluctuations and timing jitter. This paper investigates the locking bandwidths of fundamentally driven and harmonically driven high-repetition-rate act...

Dynamics of actively mode-locked Quantum Cascade Lasers.

The impact of upper state lifetime and spatial hole burning on pulse shape and stability in actively mode locked QCLs is investigated by numerical simulations. It is shown that an extended upper state lifetime is necessary to achieve stable isolated pulse formation per roundtrip. Spatial hole burning helps to reduce the pulse duration by supporting broadband multimode lasing, but introduces pul...

Mode Locked Fiber Lasers