TITLE

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

AUTHOR(S)
Blanchard, Romain; Mansuripur, Tobias S.; Gökden, Burc; Yu, Nanfang; Kats, Mikhail; Genevet, Patrice; Fujita, Kazuue; Edamura, Tadataka; Yamanishi, Masamichi; Capasso, Federico
PUB. DATE
May 2013
SOURCE
Applied Physics Letters;5/13/2013, Vol. 102 Issue 19, p191114
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We demonstrate a tapered quantum cascade laser with sloped side-walls emitting a high-brightness single-lobe beam at 8.1 μm with a peak power of 4 W at room temperature. Using a combination of high and low reflectivity facet coatings, the power output is increased to 6.2 W 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.
ACCESSION #
87655880

 

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