Abstract

We consider the collective spontaneous recombination in direct band-gap semiconductors. In a rigorous formulation of the problem we suppose that at initial moment a pump-pulse creates degenerate electron-hole (eh) pairs near the band-gap edges. The incipient generation of eh pairs radiation starts in the absence of coherent external field at the resonant frequency, (ω₀≅ε_gap/ħ. Then, recombination superradiance of eh plasma is a rapid transient process, that does not depend on relaxation and thermal effects, and provides the fundamental limits on the minimum duration, τ_RSR, and the maximum intensity, I_RSR, of spontaneous pulses emitted out of an active sample.^[1,2]

© 1992 IQEC