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, Elvis Mujagic, Clemens Schwarzer, Clemens Schwarzer, Werner Schrenk, Werner Schrenk, Yu Yao, Yu Yao, Jianxin Chen, Jianxin Chen, Claire F. Gmachl, Claire F. Gmachl, Gottfried Strasser, 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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