High-power low-divergence tapered quantum cascade lasers with plasmonic collimators


Romain Blanchard, Tobias S. Mansuripur, Burc Goekden, Nanfang Yu, Mikhail Kats, Patrice Genevet, Kazuue Fujita, Tadataka Edamura, Masamichi Yamanishi, and Federico Capasso. 2013. “High-power low-divergence tapered quantum cascade lasers with plasmonic collimators.” APPLIED PHYSICS LETTERS, 102, 19.
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We demonstrate a tapered quantum cascade laser with sloped side-walls emitting a high-brightness single-lobe beam at 8.1 mu m with a peak power of 4W at room temperature. Using a combination of high and low reflectivity facet coatings, the power output is increased to 6.2W while a high beam quality is maintained. Plasmonic collimators are fabricated on the facet of the uncoated lasers without compromising power output, demonstrating the viability of this beam-shaping strategy for high-power lasers. The collimated lasers emit a beam with a more circular cross-section, which is more amenable to high-efficiency coupling into mid-infrared optical fibers. (C) 2013 AIP Publishing LLC.
Last updated on 06/09/2020