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External ring-cavity quantum cascade lasers
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DOI：10.1063/1.4800073.png)
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An external ring-cavity quantum cascade laser (QCL) is demonstrated. Gain competition between the clockwise and anticlockwise ring-cavity modes results in a transition from bidirectional to directional emission as current is increased. In the directional regime, spatial hole burning (SHB) is suppressed, and the spectrum evolves to a single longitudinal mode, in contrast with the multimode spectrum of a comparable Fabry-Perot QCL. The absence of SHB and the long path-length of the external cavity make this laser an excellent candidate for active mode-locking and high-sensitivity spectroscopic applications in the mid-infrared. A proof-of-principle intracavity absorption spectroscopic detection of water vapor is demonstrated. (C) 2013 American Institute of Physics.
Keyword:
ENHANCED SPECTROSCOPY
BISTABILITY
期刊
IF:
3.6
论文数:
10.4W
被引数:
17.8W
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