A flexible terahertz waveguide for delivery and filtering of quantum-cascade laser radiation
We demonstrate that a specially designed microstructured polymer waveguide can improve the quality of quantum cascade laser radiation. It can filter out undesired side frequencies and transform the delivered radiation to a sub-millimeter size beam with a Gaussian-like cross-section. The spatial dist...
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Veröffentlicht in: | Applied physics letters 2018-09, Vol.113 (13) |
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Hauptverfasser: | , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | We demonstrate that a specially designed microstructured polymer waveguide can improve the quality of quantum cascade laser radiation. It can filter out undesired side frequencies and transform the delivered radiation to a sub-millimeter size beam with a Gaussian-like cross-section. The spatial distribution of the bended waveguide mode is measured, and low bending losses of the fundamental mode are confirmed. Detailed optimization of a capillary structure for 3 THz frequency allows delivering single frequency radiation up to a 1 meter distance. The results of the experimental study are confirmed by calculations with an accurate mode solver that explains the achieved losses of ∼10 dB/m. A further improvement strategy is suggested. |
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ISSN: | 0003-6951 1077-3118 |
DOI: | 10.1063/1.5040306 |