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

Research output: Contribution to journalArticlepeer-review

48 Scopus citations


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)


Dive into the research topics of 'Injectorless quantum-cascade lasers'. Together they form a unique fingerprint.

Cite this