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Photon-induced carrier transport in high efficiency midinfrared quantum cascade lasers
Photon-induced carrier transport midinfrared quantum cascade lasers Optics
2011/8/18
Abstract: A midinfrared quantum cascade laser with high wall-plug efficiency is analyzed by means of an ensemble Monte Carlo method. Both the carrier transport and the cavity field dynamics are includ...
Temperature performance analysis of terahertz quantum cascade lasers: Vertical versus diagonal designs
Temperature performance analysis terahertz quantum cascade lasers Vertical versus diagonal designs
2011/9/14
Resonant phonon depopulation terahertz quantum cascade lasers based on vertical and diagonal lasing transitions are systematically compared using a well established ensemble Monte-Carlo approach. The ...
Modeling bound-to-continuum terahertz quantum cascade lasers: The role of Coulomb interactions
Modeling bound-to-continuum terahertz quantum cascade lasers Coulomb interactions
2011/9/14
Based on an ensemble Monte Carlo analysis, we show that Coulomb interactions play a dominant role in boundto-continuum terahertz quantum cascade lasers and thus require careful modeling. Coulomb inter...
Monte-Carlo-based spectral gain analysis for THz quantum cascade lasers
THz quantum cascade lasers Monte-Carlo-based spectral gain analysis
2011/9/14
Employing an ensemble Monte Carlo transport simulation, we self-consistently analyze the spectral gain for different THz quantum cascade laser structures, considering bound-to-continuum as well as res...
Monte Carlo study of carrier-light coupling in terahertz quantum cascade lasers
Monte Carlo carrier-light coupling terahertz quantum cascade lasers
2011/9/14
We present a method for self-consistently including the optical cavity field into Monte Carlo-based carrier transport simulations. This approach allows for an analysis of the actual lasing operation i...
Photoluminescence characterization of AlGaAs/GaAs test superlattices used for optimization of quantum cascade laser technology
photoluminescence spectroscopy quantum cascade lasers
2011/5/11
In this paper, we present the application of photoluminescence spectroscopy as a diagnostic method for evaluation of correctness and homogeneity of AlGaAs/GaAs test superlattices used in the developm...
(100) GaAs surface treatment prior to contact metal deposition in AlGaAs/GaAs quantum cascade laser processing
GaAs surface treatment
2011/5/11
The effects of HCl-based chemical and Ar+ sputter etching treatment on (100) GaAs surface properties with the aim to develop the procedure of surface preparation before metal deposition have been inve...
Low resistance ohmic contacts to n-GaAs for application in GaAs/AlGaAs quantum cascade lasers
ohmic contacts sputtering
2011/5/10
This paper reports on the results of optimization of ohmic contacts for GaAs/AlGaAs quantum cascade lasers (QCLs). Technological parameters during optimization concerned surface preparation, evaporat...
Methodical study of nitrous oxide eddy covariance measurements using quantum cascade laser spectrometery over a Swiss forest
Methodical study nitrous oxide eddy covariance measurements quantum cascade
2010/1/14
Nitrous oxide fluxes were measured at the Lägeren CarboEurope IP flux site over the multi-species mixed forest dominated by European beech and Norway spruce. Measurements were carried out during ...
Suitability of quantum cascade laser spectroscopy for CH4 and N2O eddy covariance flux measurements
Suitability quantum cascade laser spectroscopy CH4 N2O eddy covariance flux measurements
2010/1/14
A quantum cascade laser spectrometer was evaluated for eddy covariance flux measurements of CH4 and N2O using three months of continuous measurements at a field site. The required criteria for eddy co...
Envelope function description of quantum cascade laser electronic states
quantum cascade lasers electronic structure
2011/4/27
In this paper, we present a natural method of finding wavefunctions and energy levels in quantum cascade lasers. The envelope function approximation has been successfully used for modelling electronic...