title: Note: Coherent detection of terahertz radiation employing a continuous wave optical parametric source.
abstract: The combination of an all-optical terahertz source with a photoconductive antenna to achieve coherent detection is presented. This approach aims to overcome the frequency limits introduced by optoelectronic terahertz sources commonly used. Here the Gaussian-shaped and linearly polarized terahertz waves are generated by a continuous wave optical parametric oscillator with a power of 3 μW at 1.4 THz. The infrared signal light of the optical parametric oscillator can be used to coherently detect the generated terahertz wave with a photoconductive antenna. As a proof-of-principle experiment we determine the thickness profile of a plastic lens using phase shifting interferometry.
authors.affiliation: Institute of Physics, University of Bonn, Bonn, Germany. jenkie@uni-bonn.de
authors.forename: Jens
authors.initials: J
authors.lastname: Kiessling
authors.forename: Rosita
authors.initials: R
authors.lastname: Sowade
authors.forename: Iván Cámara
authors.initials: IC
authors.lastname: Mayorga
authors.forename: Karsten
authors.initials: K
authors.lastname: Buse
authors.forename: Ingo
authors.initials: I
authors.lastname: Breunig