High Power Femtosecond Diode Lasers

Ulm, Thorsten; Harth, Florian; L’huillier, Johannes A.

doi:10.1007/978-3-319-17659-8_2

Cited by 1 publication

(1 citation statement)

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“…To reach higher powers and shorter pulses, an external amplification-compression scheme is required. This way, the pulse duration can be reduced to 276 fs with a peak power of 661 W at a repetition rate of 3.3 GHz [4], but at the expense of an increased complexity of the system. In addition, edge emitters exhibit a relatively long active region where the light is confined in a waveguide, which fundamentally increases the amplified spontaneous emission and thus increases the noise level, limiting their suitability for meteorology applications.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast non-equilibrium carrier dynamics in semiconductor laser mode-locking

Hader

Scheller

Laurain

et al. 2016

Semicond. Sci. Technol.

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Experimental and theoretical results on the mode-locking dynamics in vertical-external-cavity surface-emitting lasers with semiconductor and graphene saturable absorber mirrors are reviewed with an emphasis on the role of nonequilibrium carrier effects. The systems are studied theoretically using a fully microscopic many-body model for the carrier distributions and polarizations, coupled to Maxwell's equations for the field propagation. Pump-probe measurements are performed with (sub-) 100 fs resolution. The analysis shows that the nonequilibrium carrier dynamics in the gain quantum-wells and saturable absorber medium significantly influences the system's response and the resulting mode-locked pulses. The microscopic model is used to study the pulse build up from spontaneous emission noise and to determine the dependence of achievable pulse lengths and fluences on the amounts of saturable and non-saturable losses and the optical gain. The change of the group delay dispersion (GDD) on the pump level is examined and the dependence of the pulse lengths on the total amount of GDD is demonstrated experimentally. Theory-experiment comparisons are used to demonstrate the highly quantitative accuracy of the fully microscopic modeling.

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Section: Introductionmentioning

confidence: 99%