Quasi-periodic superradiant regime of femtosecond pulse generation in quantum-well and quantum-dot semiconductor lasers
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We propose a new type of accessible sources of ultrashort pulses based on the phenomenon of collective coherent recombination (superradiance) of electrons and holes in semiconductor heterostructures. We find and analyze a novel regime of an ultrafast operation of quantum-well or quantum-dot semiconductor lasers in which a quasiperiodic sequence of femtosecond superradiant pulses is emitted under quasi-stationary pumping. According to our calculations for AlGaAs-GaAs heterostructures, the coherent optical pulses of duration 30 fs and peak intensity 100 MW/cm2can be generated in a low-Q cavity of length 10-30 m. It is shown that the same process of femtosecond superradiant recombination can be used for the room-temperature generation of optical coherent emission in multiple quantum-well or quantum dot GeSi/Ge structures employing direct radiative transitions from the -valley.
