Far-Infrared Spontaneous Intraband Emission from Laser Structures with Quantum Dots and Quantum Wells.

摘要

Spontaneous far-infrared radiation (Lambda = approx. 10 yo 20 micrometers) from laser structures with vertical coupled lnGaAs/AlGaAs quantum dots (QD) connected with intrasubband hole and electron transitions between levels of size quantization in QD as well as with transitions from continuum to QD levels was found. Far-infrared radiation is observed only under simultaneous generation of short wavelength interband radiation (A = about 0.94 micrometers) and has a current threshold just as short wavelength radiation. Spontaneous far- infrared radiation is observed also from laser lnGaAs/GaAs structures with quantum wells (Qw). Intensity of this radiation is about of order less then intensity of radiation from structures with quantum dots and has no current threshold.