1 November 2010 Strategies toward the realization of two-dimensional broadband and coherent quantum cascade ring laser arrays
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Abstract
We present ring-cavity surface-emitting lasers (ring-CSELs) based on quantum cascade structures as an elementary building block for two-dimensional quantum cascade laser arrays. The devices operate at temperatures of 380 K and above. A reduction in threshold current density and enhanced radiation efficiency are observed as compared to Fabry-Pérot lasers. The devices exhibit single-mode emission at a wavelength around 8 µm with a side-mode suppression ratio of 30 dB at room temperature. Tuning of the resonance is achieved by variation of the grating period or change in temperature. The emitters exhibit a low-divergence ring-shaped beam pattern with a lobe separation of 1.5 deg. Based on a direct coupling scheme, phase locking of two ring-CSELs is demonstrated with a fringe visibility of 60%. Coherent operation of ring-type lasers results in a narrow spectral line and thus in an enhancement of the spectral brightness.
© (2010) Society of Photo-Optical Instrumentation Engineers (SPIE)
Elvis Mujagic, Clemens Schwarzer, Werner Schrenk, Yu Yao, Jianxin Chen, Claire F. Gmachl, Gottfried Strasser, "Strategies toward the realization of two-dimensional broadband and coherent quantum cascade ring laser arrays," Optical Engineering 49(11), 111113 (1 November 2010). https://doi.org/10.1117/1.3505830 . Submission:
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