Injectorless quantum-cascade lasers

Michael C. Wanke, Federico Capasso, Claire Gmachl, Alessandro Tredicucci, Deborah L. Sivco, Albert L. Hutchinson, S. N.George Chu, Alfred Y. Cho

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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.

Original languageEnglish (US)
Pages (from-to)3950-3952
Number of pages3
JournalApplied Physics Letters
Issue number25
StatePublished - Jun 18 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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    Wanke, M. C., Capasso, F., Gmachl, C., Tredicucci, A., Sivco, D. L., Hutchinson, A. L., Chu, S. N. G., & Cho, A. Y. (2001). Injectorless quantum-cascade lasers. Applied Physics Letters, 78(25), 3950-3952.