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11 August 2009 Wavelength beam combining of quantum cascade laser arrays for remote sensing
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Abstract
Wavelength beam combining was used to co-propagate beams from 28 elements in a linear array of distributedfeedback quantum cascade lasers (DFB-QCLs). The overlap of the beams in the far-field is improved using wavelength beam combining; the beam-quality product of the array, defined as the product of near-field spot size and far-field divergence for the entire array, was improved by a factor of 21. We measured the absorption spectrum of isopropanol at a distance of 6 m from the laser arrays, demonstrating the efficacy of wavelength beam combined DFB-QCL arrays for remote sensing.
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Benjamin G. Lee, Jan Kansky, Anish K. Goyal, Christian Pflügl, Laurent Diehl, Mikhail A. Belkin, Antonio Sanchez, and Federico Capasso "Wavelength beam combining of quantum cascade laser arrays for remote sensing", Proc. SPIE 7460, Lidar Remote Sensing for Environmental Monitoring X, 746004 (11 August 2009); https://doi.org/10.1117/12.826497
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