||Y. Silberberg, P. W. Smith, D. J. Eilenberger,
D. A. B. Miller, A. C. Gossard and W. Wiegmann, "Passive Modelocking
of a Semiconductor Diode Laser," Optics Lett. 9, 507-509 (1984).
using a GaAs/GaAlAs multiple-quantum-well sample as a saturable absorber in an external
resonator the authors have passively mode locked a GaAs laser to obtain pulses as short as
1.6 psec, the shortest pulses ever observed to their knowledge from a mode-locked diode
laser in a regulator pulse train
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