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Optical Engineering

Strategies toward the realization of two-dimensional broadband and coherent quantum cascade ring laser arrays
Author(s): Elvis Mujagic; Clemens Schwarzer; Werner Schrenk; Yu Yao; Jianxin Chen; Claire F. Gmachl; Gottfried Strasser
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Paper 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.

Paper Details

Date Published: 1 November 2010
PDF: 8 pages
Opt. Eng. 49(11) 111113 doi: 10.1117/1.3505830
Published in: Optical Engineering Volume 49, Issue 11
Show Author Affiliations
Elvis Mujagic, Technische Univ. Wien (Austria)
Clemens Schwarzer, Technische Univ. Wien (Austria)
Werner Schrenk, Technische Univ. Wien (Austria)
Yu Yao, Princeton Univ. (United States)
Jianxin Chen, Princeton Univ. (United States)
Claire F. Gmachl, Princeton Univ. (United States)
Gottfried Strasser, Technische Univ. Wien (Austria)

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