Title :
Hartmann sensor for wavefront measurements at terahertz frequencies
Author :
Richter, H. ; Greiner-Bar, M. ; Dessmann, N. ; Pfund, J. ; Wienold, M. ; Schrottke, L. ; Grahn, H.T. ; Hubers, Heinz-Wilhelm
Author_Institution :
German Aerosp. Center (DLR), Berlin, Germany
Abstract :
The measurement of the wavefront of a terahertz (THz) beam is essential for the development of any optical instrument operating at THz frequencies. We have realized a Hartmann wavefront sensor for the THz frequency range. The sensor is based on an aperture plate consisting of a regular square pattern of holes and a microbolometer camera. The performance of the sensor is demonstrated by characterizing the wavefront of a THz beam emitted by a quantum-cascade laser.
Keywords :
bolometers; cameras; microsensors; microwave measurement; optical variables measurement; quantum cascade lasers; terahertz wave imaging; wavefront sensors; Hartmann wavefront sensor; THz beam; THz frequency range; aperture plate; hole regular square pattern; microbolometer camera; optical instrument; quantum cascade laser; wavefront measurement; Frequency measurement; Lenses; Metals; Phase measurement;
Conference_Titel :
Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2013 38th International Conference on
Conference_Location :
Mainz
DOI :
10.1109/IRMMW-THz.2013.6665518
