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

doi:10.1117/12.2209105

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.

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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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