Degl'Innocenti, Riccardo and Shah, Y. D. and Jessop, D. S. and Ren, Y. and Wallis, R. and Mitrofanov, O. and Beere, H. E. and Ritchie, D. A. (2014) Hollow metallic waveguides for beam shaping THz QCL. In: 2014 39th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2014. IEEE Computer Society, USA. ISBN 9781479938773
Full text not available from this repository.Abstract
We have realized a compact beam-shaping and collimating element for a double metal terahertz (THz) quantum cascade laser (QCL) emitting around 2.9 THz using directly integrated hollow metallic waveguides. Our approach allowed us to efficiently improve the beam profile with respect to the standard emission pattern observed out of a double metal QCL. The Gaussian-like mode profile emerging from the metallic waveguides also exhibited a remarkable degree of collimation. The other laser characteristics such as the total output power and maximal operational temperature were marginally affected.