Abstract
Intersubband absorption of mid-IR light was studied in heterostructures with asymmetrical tunnel-coupled quantum wells in equilibrium conditions and under high-power pumping by picosecond pulses of light. The energy spectrum of electrons in tunnel-coupled quantum wells was found from an analysis of equilibrium and nonequilibrium intersubband absorption spectra. The dynamics of intersubband absorption under high-power optical pumping was studied using the pump-and-probe picosecond technique. The experimental data are compared with the results of calculations based on solving rate equations. The intersubband relaxation times are determined.
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