Optical gain in (Zn, Cd)Se-Zn(S, Se) quantum wells

F. P. Logue, P. Rees, J. F. Heffernan, C. Jordan, J. F. Donegan, J. Hegarty, F. Hiei, S. Taniguchi, T. Hino, K. Nakano, A. Ishibashi

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

We have investigated the mechanism of stimulated emission in ZnCdSe-ZnSSe quantum wells through optically pumped measurements of the gain spectrum in a variety of structures from 270 to 77 K. We also calculated the optical gain, using a model that includes many-body effects, and found excellent agreement between the calculated gain line shapes and our measurements. Under the conditions studied, which are close to those found in an operating laser diode, we conclude that the stimulated emission arises from an electron-hole plasma in our samples, even down to 77 K. Although our measurements do not rule out exciton gain mechanisms at other temperatures or operating conditions, sensitive line-shape fitting does not require them in our case. However, our line-shape analysis does show that Coulomb enhancement is significant, even at room temperature.

Original languageEnglish (US)
Pages (from-to)1295-1304
Number of pages10
JournalJournal of the Optical Society of America B: Optical Physics
Volume15
Issue number4
DOIs
StatePublished - Apr 1998

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics

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