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Brightness and filamentation of a beam from powerful cw quantum-well In<sub>0.2</sub>Ga<sub>0.8</sub>As/GaAs lasers
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2000
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Quantum PhotonicsRadiation BrightnessEngineeringLaser ScienceLaser PhysicsLaser ApplicationsSuper-intense LasersSurface-emitting LasersHigh-power LasersSemiconductor LasersFilamentation PeriodOptical PumpingPhotonicsPowerful Cw Quantum-wellPhotoluminescencePhysicsLaser Beam PropagationLaser ClassificationRadiation FilamentationApplied PhysicsQuantum Photonic DeviceOptoelectronics
Near- and far-field patterns are studied for powerful (above 2-W cw output) quantum-well heterojunction InGaAs/AlGaAs/GaAs lasers. The maximum radiation brightness was 1.7·107 W cm-2 sr-1. It is shown that the radiation filamentation is already observed 10 — 20% above the lasing threshold. The filamentation period decreases from 50 to 10 μm with increasing pumping current from almost the lasing threshold to an excess of 20% over the threshold. The filamentation results in the tenfold decrease in the radiation brightness of lasers compared to the theoretical value.