Spectrally resolved far-fields of terahertz quantum cascade lasers
Abstract
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-P\'erot 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.
Keywords
Cite
@article{arxiv.1608.05257,
title = {Spectrally resolved far-fields of terahertz quantum cascade lasers},
author = {Martin Brandstetter and Sebastian Schönhuber and Michael Krall and Martin A. Kainz and Hermann Detz and Tobias Zederbauer and Aaron M. Andrews and Gottfried Strasser and Karl Unterrainer},
journal= {arXiv preprint arXiv:1608.05257},
year = {2016}
}
Comments
8 pages, 4 figures