Stimulated emission at 474 nm from an InGaN laser diode structure grown on a (112-2) GaN substrate

K. Kojima, M. Funato, Y. Kawakami, S. Masui, S. Nagahama, T. Mukai

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The stimulated emissions from semipolar InGaN laser diode (LD) structures grown on (112-2) GaN substrates are observed at room temperature under photopumped conditions. The measured emission peaks are in the photon energy range from 2.62 eV (474 nm) to 3.05 eV (405 nm), and the emission intensity has a threshold behavior with respect to the pumping power. A strong in-plane optical anisotropy is observed between the two perpendicular directions, [1- 1-23] and [11-00], due to anisotropic matrix elements, which depend on the crystal orientation; the stimulated emission measured along the [1- 1-23] direction occurs with a lower threshold pumping power at a lower energy compared to that obtained along the [11-00] direction. The experimental results and the valence band calculations indicate that the transverse-electric mode with an electric vector along the [11-00] direction is dominant for gain formation in semipolar and nonpolar InGaN LDs. Compared to c -plane InGaN LDs, semipolar InGaN LDs have comparable or less threshold pumping powers.

Original languageEnglish
Article number251107
JournalApplied Physics Letters
Issue number25
Publication statusPublished - 2007 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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