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

Mujagić, Elvis; Nobile, Michele; Detz, Hermann; Schrenk, Werner; Jianxin Chen; Gmachl, Claire; Strasser, Gottfried
January 2010
Applied Physics Letters;1/18/2010, Vol. 96 Issue 3, p031111
Academic Journal
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–Pérot (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 8 μm 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°.


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