# Electro-optic sensor for static fields

J. O. Grasdijk, X. F. Bai, I. Engin, K. Jungmann, H. J. Krause, B. Niederländer, A. Offenhäuser, M. Repetto, L. Willmann, S. Zimmer

1 Citation (Scopus)

## Abstract

A sensor has been developed for low frequency and DC electric fields E. The device is capable of measuring fields with $$\varDelta \mathrm{E}= 4$$ΔE=4(1) V/cm resolution. It is based on a Y-cut Z-propagation lithium niobate electro-optic crystal. For a particular commercially available bare crystal, we achieved an in air time constant $$\tau _\mathrm{c}(\mathrm air)= 6.4(1.8)$$τc(air)=6.4(1.8) h for the decay of the electro-optic signal. This enables field monitoring for several hours. As an application, we demonstrated that a constant electric field $$E^{\mathrm{ext}} = 640$$Eext=640 V/cm applied via external electrodes to a particular spherical glass container holding an Xe/He gas mixture decays inside this cell with a time constant $$\tau _{E}^{\mathrm{glass}} = 2.5(5)$$τEglass=2.5(5) h. This is sufficient for the needs of experiments searching for a permanent electric dipole moment in $$^{129}$$129Xe. An integrated electric field sensor has been constructed which is coupled to a light source and light detectors via optical fibers. The sensor head does not contain any electrically conducting material.
Original language English 212 8 Applied Physics B 125 11 https://doi.org/10.1007/s00340-019-7326-5 Published - Nov-2019
• ### Correction to: Electro-optic sensor for static fields (vol 125, pg 212, 2019)

Grasdijk, J. O., Bai, X. F., Engin, I., Jungmann, K., Krause, H. J., Niederlaender, B., Offenhaeuser, A., Repetto, M., Willmann, L. & Zimmer, S., Jan-2020, 126, 1, 1 p., 12.

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