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