Injectorless quantum-cascade lasers

Wanke, Michael C.; Capasso, Federico; Gmachl, Claire; Tredicucci, Alessandro; Sivco, Deborah L.; Hutchinson, Albert L.; Chu, S.-N. George; Cho, Alfred Y.
June 2001
Applied Physics Letters;6/18/2001, Vol. 78 Issue 25, p3950
Academic Journal
An "injectorless" quantum-cascade (QC) laser is presented. The requirement of using injector regions to transport electrons from the lower laser level and other low-lying energy levels of one active region to the upper laser level of the next electron-downstream active region was eliminated by using an appropriately designed double-quantum-well "chirped" superlattice active region. The major advantage of the "injectorless" QC laser is the close packing of the active regions and the concomitant large optical confinement factor. Using a cascade of 75 consecutive active regions, designed for emission at λ=11.5 μm, a pulsed peak output power of 270 mW is achieved at 7 K and approximately 10 mW at the maximum operating temperature of 195 K. © 2001 American Institute of Physics.


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