@article{article, title  = {{Improved performance from GaAs-AlGaAs quantum cascade lasers with enhanced upper laser level confinement}},

 url = {{}},

 year = {{2000}},

 month = {{4}},

 author = {{Keightley PT and Wilson LR and Cockburn JW and Skolnick MS and Clark JC and Grey R and Hill G and Hopkinson M}},

 volume = {{7}},

 journal = {{PHYSICA E}},

 issue = {{1-2}},

 pages = {{8-11}},

 note = {{Accessed on 2024/12/23}}}