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 μm. 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 Γ-valley.
author list (cited authors)
Belyanin, A. A., Kocharovsky, V. V., & Kocharovsky, V. V.
complete list of authors
Belyanin, AA||Kocharovsky, VV||Kocharovsky, Vl V