Novel infrared band-aligned superlattice laser

Perng Fei Yuh, K. L. Wang

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)


A novel infrared laser is proposed which uses the intersubband optical transition in a band-aligned superlattice. In this band-aligned superlattice laser, the miniband discontinuity within the conduction of valence band functions as a band offset in the heterojunction structure, and the population inversion is achieved by current injection as in the conventional heterojunction laser. It is more flexible than a heterojunction laser of a quantum well laser since one may tailor the bandwidth and band structures as well as the band gap of the minibands. Also indirect band-gap materials like Si and Ge can be used for lasing in the intersubband transitions. The intersubband optical transition is similar to an atomic two-level system which exhibits low threshold current, and a gain coefficient with weak temperature dependence and a narrow spectrum which is determined only by the line-shape function. These special features make the band-aligned superlattice laser competitive with and perhaps superior to the quantum well dot laser which is not presently feasible.

Original languageEnglish
Pages (from-to)1404-1406
Number of pages3
JournalApplied Physics Letters
Issue number18
Publication statusPublished - 1987

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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