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471-fs pulses are generated by injecting a 33-ps pulse train, obtained from pulse carving a 1.55-mum CW DFB laser, into a time-lens loop. High repetition rate of 1.1 GHz is demonstrated.
Pulse bursts of sub-THz rates are passively generated in a mode locked fiber laser. Repetition rates are controlled by the differential group delay of an intra cavity polarization maintaining fiber. Simulations and experiments are reported.
A theoretical study of active mode-locking in quantum cascade lasers including spatial hole-burning is presented. It is found that spatial hole-burning reduces the pulse duration at the expense of slight pulse instability and strongly structured pulse shapes.
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