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Vertically emitting terahertz quantum cascade ring lasers
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DOI：10.1063/1.3176966.png)
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We describe the fabrication and operation of vertically emitting distributed feedback quantum cascade ring lasers operating in the terahertz frequency range. A twofold increase in radiation efficiency is observed as compared to Fabry-Perot lasers. The emitters exhibit a robust single-mode operation around 3.2 THz with a side mode suppression ratio higher than 30 dB. Modal and threshold characteristics are investigated by performing finite element simulations with results in good agreement with experiments. The ring-shaped resonator facilitates beam collimation which results in a symmetric far-field profile. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3176966]
Keyword:
METAL WAVE-GUIDES
期刊
IF:
3.6
论文数:
10.4W
被引数:
17.8W
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Phase locking of a 1.5 Terahertz quantum cascade laser and use as a local oscillator in a heterodyne HEB receiver.png)
OPTICS EXPRESS
OAAI
OPTICS EXPRESSIF3.3
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