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Note: Coherent detection of terahertz radiation employing a continuous wave optical parametric source

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5 Author(s)
Kiessling, Jens ; Institute of Physics, University of Bonn, Wegelerstraße 8, D-53115 Bonn, Germany ; Sowade, Rosita ; Mayorga, Ivan Camara ; Buse, Karsten
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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.

Published in:

Review of Scientific Instruments  (Volume:82 ,  Issue: 2 )

Date of Publication:

Feb 2011

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