Ultra-short pulse non-classical light emitters utilizing multiple wide quantum wells

Following pioneering work of Dicke [1] , the superradiance (SR) can be described by its quantum origin or semi-classically, the latter being widely used to interpret experimental results in high-gain optical media. Recent studies indicate that in a laser, one should first introduce instability of the lasing regimes to get the field radiation by a coherent macroscopic dipole. So far, the approach to do so was to introduce an absorber. In this work we demonstrate SR emission using a quantum-confined Stark effect in wide GaAsP/GaInP heterostructure quantum wells (WQWs) placed in an active region of a laser diode structure. Under bias field applied to the gain structure, the electron and hole envelop wavefunctions are spatially separated, quenching the lasing emission entirely for the duration of the current pulse up to 7 µs, which is unusually long for semiconductor laser diodes. A single optical pulse appears at the end of the current pulse, when the external bias field is removed, enabling stronger overlap of carriers and yielding a sudden increase in the radiative recombination rate.