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Proceedings Paper

Surface-emitting quantum cascade laser with 2nd-order metal-semiconductor gratings for single-lobe emission
Author(s): C. Boyle; C. Sigler; J. D. Kirch; D. Lindberg; T. Earles; D. Botez; L. J. Mawst
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Paper Abstract

Grating-coupled, surface-emitting (GCSE) quantum-cascade lasers (QCLs) are demonstrated with high-power, single-lobe surface emission. A 2nd-order Au-semiconductor distributed-feedback (DFB)/ distributed-Bragg-reflector (DBR) grating is used for feedback and out-coupling. The DFB and DBR grating regions are 2.55 mm- and 1.28 mm-long, respectively, for a total grating length of 5.1 mm. The lasers are designed to operate in a symmetric longitudinal mode by causing resonant coupling of the guided optical mode to the antisymmetric surface-plasmon modes of the 2nd-order metal/semiconductor grating. In turn, the antisymmetric longitudinal modes are strongly absorbed by the metal in the grating, causing the symmetric longitudinal mode to be favored to lase, which produces a single lobe beam over a grating duty-cycle range of 36-41 %. Simulations indicate that the symmetric mode is always favored to lase, independent of the random phase of residual reflections from the device’s cleaved ends. Peak pulsed output powers of ~ 0.4 W were measured with single-lobe, single-mode operation near 4.75 μm.

Paper Details

Date Published: 10 March 2016
PDF: 11 pages
Proc. SPIE 9767, Novel In-Plane Semiconductor Lasers XV, 976714 (10 March 2016); doi: 10.1117/12.2209105
Show Author Affiliations
C. Boyle, Univ. of Wisconsin-Madison (United States)
C. Sigler, Univ. of Wisconsin-Madison (United States)
J. D. Kirch, Univ. of Wisconsin-Madison (United States)
D. Lindberg, Intraband, LLC (United States)
T. Earles, Intraband, LLC (United States)
D. Botez, Univ. of Wisconsin-Madison (United States)
L. J. Mawst, Univ. of Wisconsin-Madison (United States)


Published in SPIE Proceedings Vol. 9767:
Novel In-Plane Semiconductor Lasers XV
Alexey A. Belyanin; Peter M. Smowton, Editor(s)

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