期刊
OPTICA
卷 4, 期 10, 页码 1228-1231出版社
OPTICAL SOC AMER
DOI: 10.1364/OPTICA.4.001228
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- U.S. Department of Homeland Security (DHS) [HSHQDC-13-C-00034]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1505409] Funding Source: National Science Foundation
Mid-infrared lasers, emitting in the spectral region of 3-12 mu m that contains strong characteristic vibrational transitions of many important molecules, are highly desirable for spectroscopy sensing applications. High-efficiency quantum cascade lasers have been demonstrated with up to watt-level output power in the mid-infrared region. However, the wide wavelength tuning that is critical for spectroscopy applications still largely relies on incorporating external gratings, which have stability issues. Here, we demonstrate a monolithic, broadly tunable quantum cascade laser source emitting between 6.1 and 9.2 mu m through an on-chip integration of a sampled grating distributed feedback tunable laser array and a beam combiner. High peak power up to 65 mW has been obtained through a balanced high-gain active region design, efficient waveguide layout, and the development of a broadband antireflection coating. Nearly fundamental transverse-mode operation is achieved for all emission wavelengths with a pointing stability better than 1.6 mrad (0.1 degrees). The demonstrated laser source opens new opportunities for mid-infrared spectroscopy. (C) 2017 Optical Society of America
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