Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 13: Quantum Optics and Photonics II
Q 13.7: Vortrag
Montag, 11. März 2019, 15:45–16:00, S Gr. HS Maschb.
Towards Terahertz quantum sensing: spontaneous parametric down-conversion in MgO:LiNbO3 — •Björn Haase1,2, Mirco Kutas1,2, Felix Riexinger1,2, Patricia Bickert1, Andreas Keil1, Daniel Molter1, Michael Bortz1, 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 generate and measure the spontaneous parametric down conversion in periodically poled lithium niobate crystals, using a narrowband, frequency-stable (solid-state) laser and an uncooled sCMOS camera for detection. With very narrowband volume Bragg gratings and a transmission grating we separate the pump wavelength of the signal wavelengths close to the pump. It is possible to detect signals for down- as well as for up-conversion for the forward- as well as for the backward-generation (as well as for higher quasi phase-matching orders) resolvable down to the sub-THz frequency range. The measured spectra match very well both qualitatively and quantitatively to the theoretically expected spectral angular intensity distribution. Furthermore, it is possible to validate the measured quantitative temperature dependency of the conversion intensity even theoretically. Considering the temperature dependence, we estimate the part of the signal caused by the quantum mechanical interaction with vacuum fluctuations [Kitaeva, G.K. et al., Applied Physics B, 116(6) 929-937 (2014)].