Various structures with optical microcavities and active layers based on In
GaAs/GaAs quantum dots MBE-grown on GaAs substrates were studied theoretica
lly and experimentally. LEDs for the 1.3 mum spectral range with narrow spe
ctral characteristics and low light beam divergence were fabricated. Vertic
al lasing at 1.3 mum was obtained in a structure with oxidized AlO/GaAs mir
rors under injection pumping. (C) 2001 MAIK "Nauka/ Interperiodica".