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Extremely temperature-insensitive continuous-wave quantum cascade lasers
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DOI：10.1063/1.4765073.png)
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Conspicuous temperature performances of lambda similar to 8.7 mu m quantum cascade lasers with anticrossed dual-upper laser states are reported. The lasers characterized by strong super-linear current-light output curves exhibit an extremely high characteristic temperature for the threshold current density above 330 K (T-0 similar to 750K). The slope efficiency grows with increasing temperature (a negative T-1-value). In addition, for the pulsed operation of a short 1 mm length laser, the T-0-value reaches a value of 1085 K above 340 K. These distinctive characteristics are attributable to optical absorption quenching in the injector as well as to suppression of carrier leakage in the active region. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4765073]
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Broad-gain (Δλ/λ0∼0.4), temperature-insensitive (T0∼510K) quantum cascade lasers.png)
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