Superradiant generation of femtosecond pulses in low-dimensional semiconductor heterostructures Academic Article uri icon

abstract

  • A new type of accessible sources of ultrashort optical pulses based on the phenomenon of collective coherent recombination (superfluorescence) of electrons and holes in semiconductor heterostructures is proposed. The novel regime of an ultrafast operation of quantum-well semiconductor lasers with a low-Q cavity of length approx. 30 - 100 μm is analyzed, in which a quasiperiodic sequence of superradiant pulses of duration up to 30 fs and peak intensity exceeding 100 MW/cm2 is emitted under a continuous pumping, with typical current density of order 104 A/cm2. 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, VV

publication date

  • January 1999