Carrier-density-dependent increase and suppression of optical gain in T-shaped quantum-wire lasers

Masahiro Yoshita, Makoto Okano, Toshiyuki Ihara, Hidefumi Akiyama, Ping Huai, Tetsuo Ogawa, Loren N. Pfeiffer, Ken W. West

Research output: Contribution to journalConference article

3 Citations (Scopus)

Abstract

Carrier-density dependence of the optical-gain spectra were studied for an undoped T-shaped quantum-wire (T wire) laser by optical pumping at 4 K. The gain appeared at a low excitation power of 3 mW corresponding to the carrier density of about 3 × 105 cm-1 in the T wire. As the carrier density was increased, the peak gain increased, but it reached a maximum value of about 1 × 104 cm-1 at the carrier density of 1 × 106 cm-1 and then decreased hereafter. This peculiar gain evolution dependent on the carrier density was not explained by a simple free-electron model, which suggests significant contributions of the enhanced Coulomb interactions to the optical gain in the T-wire laser.

Original languageEnglish
Pages (from-to)2841-2843
Number of pages3
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Volume5
Issue number9
DOIs
Publication statusPublished - 2008 Dec 1
Externally publishedYes
Event34th International Symposium on Compound Semiconductors, ISCS-2007 - Kyoto, Japan
Duration: 2007 Oct 152007 Oct 18

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ASJC Scopus subject areas

  • Condensed Matter Physics

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