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  4. Phase-sensitive terahertz upconversion detection
 
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2022
Journal Article
Title

Phase-sensitive terahertz upconversion detection

Abstract
Nonlinear frequency conversion provides an elegant method to detect photons in a spectral range which differs from the pump wavelength, making it highly attractive for photons with inherently low energy. Aside from the intensity of the light, represented by the number of photons, their phase provides important information and enables a plethora of applications. We present a phase-sensitive measurement method in the terahertz spectral range by only detecting visible light. Using the optical interference of frequency-converted photons and leftover pump photons of the involved ultrashort pulses, fast determination of layer-thicknesses is demonstrated. The new method enables phase-resolved detection of terahertz pulses using standard sCMOS equipment while achieving sample measurement times of less than one second with a precision error of less than 0.6%.
Author(s)
Pfeiffer, Tobias  
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM  
Klier, Jens  
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM  
Freymann, Georg von  
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM  
Molter, Daniel  
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM  
Journal
Optics Express  
Open Access
DOI
10.1364/OE.453643
Language
English
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM  
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