Paper
10 March 2016 Surface-emitting quantum cascade laser with 2nd-order metal-semiconductor gratings for single-lobe emission
C. Boyle, C. Sigler, J. D. Kirch, D. Lindberg, T. Earles, D. Botez, L. J. Mawst
Author Affiliations +
Proceedings Volume 9767, Novel In-Plane Semiconductor Lasers XV; 976714 (2016) https://doi.org/10.1117/12.2209105
Event: SPIE OPTO, 2016, San Francisco, California, United States
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.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
C. Boyle, C. Sigler, J. D. Kirch, D. Lindberg, T. Earles, D. Botez, and L. J. Mawst "Surface-emitting quantum cascade laser with 2nd-order metal-semiconductor gratings for single-lobe emission", Proc. SPIE 9767, Novel In-Plane Semiconductor Lasers XV, 976714 (10 March 2016); https://doi.org/10.1117/12.2209105
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KEYWORDS
Quantum cascade lasers

Optical design

Lasers

Metals

Gold

Phase shifts

Semiconductor lasers

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