Ring cavity induced threshold reduction in single-mode surface emitting quantum cascade lasers

Elvis Mujagić, Michele Nobile, Hermann Detz, Werner Schrenk, Jianxin Chen, Claire F. Gmachl, Gottfried Strasser

Research output: Contribution to journalArticle

32 Scopus citations

Abstract

We present ring cavity surface emitting (RCSE) quantum cascade lasers operating at temperatures as high as 380 K and above. A reduction in threshold current density and enhanced radiation efficiency are observed as compared to Fabry-Ṕrot (FP) lasers. In continuous wave, the maximum operation temperature of RCSE lasers is 50 K higher than in FP emitters. The devices exhibit single-mode emission at a wavelength around 8μm with a side mode suppression ratio of 30 dB at room temperature. A lithographic tuning of the resonance is achieved by a variation in the grating period. The emitters exhibit a low divergent ring-shaped beam pattern with a lobe separation of ∼1.5°.

Original languageEnglish (US)
Article number031111
JournalApplied Physics Letters
Volume96
Issue number3
DOIs
StatePublished - Mar 29 2010

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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