Title :
Hollow metallic waveguides for beam shaping THz QCL
Author :
Degl´Innocenti, Riccardo ; Shah, Yash D. ; Jessop, David S. ; Ren, Yi ; Wallis, R. ; Mitrofanov, Oleg ; Beere, H.E. ; Ritchie, D.A.
Author_Institution :
Cavendish Lab., Univ. of Cambridge, Cambridge, UK
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.
Keywords :
integrated optics; laser beams; laser modes; optical collimators; optical pulse shaping; optical waveguides; quantum cascade lasers; Gaussian-like mode profile; beam profile; beam shaping THz QCL; collimating element; collimation; compact beam-shaping; directly integrated hollow metallic waveguides; double metal QCL; double metal terahertz quantum cascade laser; frequency 2.9 THz; laser characteristics; maximal operational temperature; standard emission pattern; total output power; Copper; Hollow waveguides; Laser beams; Measurement by laser beam; Optical waveguides; Quantum cascade lasers; Waveguide lasers;
Conference_Titel :
Infrared, Millimeter, and Terahertz waves (IRMMW-THz), 2014 39th International Conference on
Conference_Location :
Tucson, AZ
DOI :
10.1109/IRMMW-THz.2014.6956041
