%0 Journal Article %J APPLIED PHYSICS LETTERS %D 2013 %T High-power low-divergence tapered quantum cascade lasers with plasmonic collimators %A Blanchard, Romain %A Mansuripur, Tobias S. %A Goekden, Burc %A Nanfang Yu %A Mikhail Kats %A Patrice Genevet %A Fujita, Kazuue %A Edamura, Tadataka %A Yamanishi, Masamichi %A Federico Capasso %X 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. %B APPLIED PHYSICS LETTERS %I AMER INST PHYSICS %C CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA %V 102 %8 MAY 13 %G eng %N 19 %9 Article %R 10.1063/1.4806985