A widely voltage-tunable quantum cascade laser based on “two-step” coupling

Yu Yao; Franz, Kale J.; Xiaojun Wang; Jen-Yu Fan; Gmachl, Claire
July 2009
Applied Physics Letters;7/13/2009, Vol. 95 Issue 2, p021105
Academic Journal
A novel quantum cascade laser design with “two-step” coupling between the injector and the upper laser state is demonstrated to achieve a widely voltage-tunable laser spectrum. Electroluminescence from this design can be tuned over a range of more than 200 cm-1 with a tuning coefficient of ∼700 cm-1/V per stage. Lasers based on this design provide a tuning range of ∼100 cm-1 (8.3–9 μm) above threshold with a tuning coefficient of ∼900 cm-1/V per stage at a constant temperature of 295 K.


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