Third-order photonic-crystal distributed-feedback quantum cascade lasers |
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| Authors: | J.C. Zhang F.Q. Liu L.J. Wang L.H. Zhao W.F. Liu J.Q. Liu L. Li Z.G. Wang |
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| Affiliation: | 1. Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, People''s Republic of China;2. Department of Electronic Engineering Tsinghua University, Beijing 100084, People''s Republic of China |
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| Abstract: | We demonstrate room-temperature operation of broad-area edge-emitting photonic-crystal distributed-feedback quantum cascade lasers at λ ～ 4.6 μm. The lasers use a weak-index perturbed third-order photonic-crystal lattice to control the optical mode in the wafer plane. Utilizing this coupling mechanism, the near-diffraction-limited beam quality with a far-field profile normal to the facet can be obtained. Single-mode operation with a signal-to-noise ratio of about 20 dB is achieved in the temperature range of 85–290 K. The single-facet output power is above 1 W for a 55 μm × 2.5 mm laser bar at 85 K in pulsed mode. |
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