Sensing electromagnetic fields with the AC-Stark effect in two-photon spectroscopy of cold trapped HD+

F. L. Constantin

doi:10.1117/12.2555336

15 April 2020 Sensing electromagnetic fields with the AC-Stark effect in two-photon spectroscopy of cold trapped HD⁺

F. L. Constantin

Proceedings Volume 11347, Quantum Technologies 2020; 113470J (2020) https://doi.org/10.1117/12.2555336
Event: SPIE Photonics Europe, 2020, Online Only

Abstract

This contribution evaluates the potential for SI-traceable measurements of electromagnetic fields from precision measurements of two-photon rovibrational transitions of cold trapped HD⁺ ions interpreted with accurate theoretical models. Zeeman spectroscopy of a hyperfine component of the (v,L)=(0,0)→(2,2) transition is exploited for the measurement of a static magnetic field. The absolute sensitivity and accuracy are estimated at the 10^-10 T level in the case of frequency measurements at the quantum projection noise limit. Measurements of the AC-Stark shifts of different Zeeman components of the (v,L)=(0,0)→(2,0) transition at different orientations of the magnetic field are exploited to measure the polarisation and the intensity of a THz-wave off-resonantly coupled to HD⁺ rotational levels. The sensitivity is estimated at the 10^-7 W/m₂ level. A reference THz-wave with an intensity of 1 W/m² can be calibrated in intensity with a fractional accuracy limited at the 10^-2 level by the accuracy of the theoretical calculations and at the 10^-4 level by the experimental errors. In addition, an approach for retrieval of the full polarisation ellipse is demonstrated with a selected THz-wave. The fractional accuracy estimated for frequency measurements limited by the quantum projection noise is better than 5% for the amplitudes and better than 10% for the phases of the electric field components of the THz-wave.

Conference Presentation

Citation Download Citation

F. L. Constantin "Sensing electromagnetic fields with the AC-Stark effect in two-photon spectroscopy of cold trapped HD⁺", Proc. SPIE 11347, Quantum Technologies 2020, 113470J (15 April 2020); https://doi.org/10.1117/12.2555336

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