Chirp in a transistor laser: Franz-Keldysh reduction of the linewidth enhancement

G. Walter, A. James, N. Holonyak, M. Feng

Research output: Contribution to journalArticlepeer-review

Abstract

A quantum well (QW) transistor laser with the capability of high current density, a collector current ensuring minimal operational change (beyond laser threshold) in base QW carrier population, a favorable long narrow emitter laser geometry, and built-in base-collector Franz-Keldysh absorption (with IE + IB + IC =0), is measured for chirp-related behavior. A relatively low transistor laser linewidth enhancement factor αe ∼0.7 is obtained despite the resolution limitations of the measurement apparatus.

Original languageEnglish (US)
Article number091109
JournalApplied Physics Letters
Volume90
Issue number9
DOIs
StatePublished - Mar 9 2007

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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