Journal
OPTICAL ENGINEERING
Volume 49, Issue 11, Pages -Publisher
SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
DOI: 10.1117/1.3505830
Keywords
quantum cascade laser; midinfrared; ring cavity; single mode; far field; laser array; coherent coupling
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Funding
- IR-ON
- ADLIS
- PLATON
- Gesellschaft fur Mikro- und Nanoelektronik (GMe)
- NYSTAR
- MIRTHE (NSF-ERC)
- Austrian Science Fund (FWF) [F 2503] Funding Source: researchfish
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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-Perot lasers. The devices exhibit single-mode emission at a wavelength around 8 mu m 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. (C) 2010 Society of Photo-Optical Instrumentation Engineers. [DOI: 10.1117/1.3505830]
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