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Alignment-stabilized interference filter-tuned external-cavity quantum cascade laser
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DOI：10.1364/OL.39.006561.png)
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A passively alignment-stabilized external cavity quantum cascade laser (EC-QCL) employing a cat's eye-type retroreflector and an ultra-narrowband transmissive interference filter for wavelength selection is demonstrated and experimentally investigated. Compared with conventional grating-tuned ECQCLs, the setup is nearly two orders of magnitude more stable against misalignment of the components, and spectral fluctuation is reduced by one order of magnitude, allowing for a simultaneously lightweight and fail-safe construction, suitable for applications outdoors and in space. It also allows for a substantially greater level of miniaturization and cost reduction. These advantages fit in well with the general properties of modern QCLs in the promise to deliver useful and affordable mid-infraredlight sources for a variety of spectroscopic and imaging applications. (C) 2014 Optical Society of America
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3.3
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4.0W
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