Far-Infrared Spontaneous Intraband Emission from Laser Structures with Quantum Dots and Quantum Wells
SAINT PETERSBURG STATE TECHNICAL UNIV (RUSSIA)
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Spontaneous far-infrared radiation Lambda approx. 10 yo 20 micrometers from laser structures with vertical coupled lnGaAsAlGaAs 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 lnGaAsGaAs 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.
- Lasers and Masers
- Solid State Physics