PROJECT TITLE :

Passive modelocking due to diagonal optical transition in asymmetric double quantum well

ABSTRACT :

Passive modelocking (PML) due to diagonal optical transition was observed in two coupled asymmetric double quantum well laser structures for the primary time. Two InGaAs/GaAs QW structures with different barrier width between wells were compared. Passive modelocking in skinny barrier structures was realised at reverse biases between zero.seven-one.1 V when carrier tunnelling takes place. In structures with a thick barrier, PML was observed only at reverse biases higher than 3.3 V when the absorption edge is shifted to the lasing wavelength because of the quantum confinement Stark result.


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