Rostock 2019 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 58: Poster: Quantum Optics and Photonics III
Q 58.11: Poster
Thursday, March 14, 2019, 16:15–18:15, S Atrium Informatik
Towards Terahertz quantum sensing: Measurement of spontaneous parametric down conversion in the terahertz frequency range. — •Mirco Kutas1,2, Björn Haase1,2, Daniel Molter1, and Georg von Freymann1,2 — 1Fraunhofer-Institute for Industrial Mathematics ITWM, Fraunhofer-Platz 1, 67663 Kaiserslautern — 2Department of Physics and Research Center OPTIMAS, Technische Universität Kaiserslautern (TUK), 67663 Kaiserslautern
We show an experimental setup to measure spontaneous parametric down conversion (SPDC) in the terahertz and even sub-terahertz frequency range. The signal and idler pairs are generated in periodically poled LiNbO3 (PPLN) using a frequency-stable solid-state laser at 660nm as pump source. Detection is achieved by extremely narrowband volume Bragg gratings suppressing the pump photons after the crystal while transmitting the slightly frequency shifted signal photons. As detector we use an uncooled scientific CMOS camera with a comparatively low quantum efficiency and high dark count rate. Using a highly efficient transmission grating, we resolve a frequency angular spectrum of the signal photons. It shows backward and forward generation of terahertz and sub-terahertz photons by SPDC as well as conversion of thermal radiation and higher order quasi phase-matching. [Kitaeva, G.K. et al. Applied Physics B, 116(4), 929–937, (2014)], [Kornienko, V.V. et al. APL Photonics 3, 051704, (2018)]