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We have investigated the interbаnd photoluminescence (PL) in stepped and tunnel-coupledquantum well (QW) under powerful picosecond excitation and cw excitation. Polarization of PL wasinvestigated. In contradistinction from case of cw excitation, PL spectra in case of powerful picosecondexcitation are demonstrated peaks associated with both ground and high-lying exited levels in steppedquantum wells and in tunnel-coupled quantum wells. Presence of intersubband population inversion instepped QW is also demonstrated under picosecond excitation. First the intersubband lasing was discoveredin the three level tunnel-coupled QWs.
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