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Opt Express. 2009 Aug 31;17(18):16216-24. doi: 10.1364/OE.17.016216.

Beam combining of quantum cascade laser arrays.

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  • 1Harvard University, School of Engineering and Applied Sciences, Cambridge, MA, USA.

Abstract

Wavelength beam combining was used to co-propagate beams from 28 elements in an array of distributed-feedback quantum cascade lasers (DFB-QCLs). 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 by using wavelength beam combining. To demonstrate the applicability of wavelength beam combined DFB-QCL arrays for remote sensing, we obtained the absorption spectrum of isopropanol at a distance of 6 m from the laser array.

PMID:
19724621
[PubMed]
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