Spectrally resolved far-fields of terahertz quantum cascade lasers

We demonstrate a convenient and fast method to measure the spectrally resolved far-fields of multimode terahertz quantum cascade lasers by combining a microbolometer focal plane array with an FTIR spectrometer. Far-fields of fundamental TM0 and higher lateral order TM1 modes of multimode Fabry-Pérot...

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Bibliographic Details
Published in:Optics express 2016-10, Vol.24 (22), p.25462-25470
Main Authors: Brandstetter, Martin, Schönhuber, Sebastian, Krall, Michael, Kainz, Martin A, Detz, Hermann, Zederbauer, Tobias, Andrews, Aaron M, Strasser, Gottfried, Unterrainer, Karl
Format: Article
Language:English
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Summary:We demonstrate a convenient and fast method to measure the spectrally resolved far-fields of multimode terahertz quantum cascade lasers by combining a microbolometer focal plane array with an FTIR spectrometer. Far-fields of fundamental TM0 and higher lateral order TM1 modes of multimode Fabry-Pérot type lasers have been distinguished, which very well fit to the results obtained by a 3D finite-element simulation. Furthermore, multimode random laser cavities have been investigated, analyzing the contribution of each single laser mode to the total far-field. The presented method is thus an important tool to gain in-depth knowledge of the emission properties of multimode laser cavities at terahertz frequencies, which become increasingly important for future sensing applications.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.24.025462