Université de Fribourg

Study of ³He Rabi nutations by optically-pumped cesium magnetometers

Koch, Hans-Christian ; Bison, Georg ; Grujiæ, Zoran Dragan ; Heil, Werner ; Kasprzak, Malgorzata ; Knowles, Paul ; Kraft, Andreas ; Pazgalev, Anatoly ; Schnabel, Allard ; Voigt, Jens ; Weis, Antoine

In: The European Physical Journal D, 2017, vol. 71, no. 10, p. 262

We describe a method for recording the Rabi nutation of nuclear spin polarized ³He by optically pumped cesium magnetometers. The measurement is performed by detecting the time-dependent magnetic field produced by the 3He magnetization. The observed signals are compared to theoretical models and the results are used to precisely trace the evolution of the magnetization. This procedure...

Université de Fribourg

Investigation of the intrinsic sensitivity of a ³He/Cs magnetometer

Koch, Hans Christian ; Bison, Georg ; Grujić, Zoran D. ; Heil, Werner ; Kasprzak, Malgorzata ; Knowles, Paul ; Kraft, Andreas ; Pazgalev, Anatoly ; Schnabel, Allard ; Voigt, Jens ; Weis, Antoine

In: The European Physical Journal D, 2015, vol. 69, no. 11, p. 1–11

We report on extensive studies on the intrinsic sensitivity of a combined ³He/Cs magnetometer. The magnetometer relies on the detection of the free spin precession of nuclear spin polarized ³He by optically pumped cesium magnetometers. We characterize the relevant processes involved in the detection and quantify their impact on the total sensitivity of the magnetometer. An expression is derived...

Université de Fribourg

Design and performance of an absolute 3He/Cs magnetometer

Koch, Hans-Christian ; Bison, Georg ; Grujić, Zoran D. ; Heil, Werner ; Kasprzak, Malgorzata ; Knowles, Paul ; Kraft, Andreas ; Pazgalev, Anatoly ; Schnabel, Allard ; Voigt, Jens ; Weis, Antoine

In: The European Physical Journal D, 2015, vol. 69, no. 8, p. 1–12

We report on the design and performance of a highly sensitive combined ³He/Cs magnetometer for the absolute measurement of magnetic fields. The magnetometer relies on the magnetometric detection of the free spin precession of nuclear spin polarized ³He gas by optically pumped cesium magnetometers. We plan to deploy this type of combined magnetometer in an experiment searching for a permanent...

Université de Fribourg

Measurement of the scalar third-order electric polarizability of the Cs ground state using coherent-population-trapping spectroscopy in Ramsey geometry

Robyr, Jean-Luc ; Knowles, Paul ; Weis, Antoine

In: Physical Review A, 2014, vol. 90, no. 1, p. 012505

The ac-Stark shift induced by blackbody radiation is a major source of systematic uncertainty in present-day cesium microwave frequency standards. The shift is parametrized in terms of a third-order electric polarizability α(3)0 that can be inferred from the static electric-field displacement of the clock transition resonance. In this paper, we report on an all-optical...

Université de Fribourg

Lifetime and population of the 2S state in muonic hydrogen and deuterium

Diepold, Marc ; Amaro, Fernando D. ; Antognini, Aldo ; Biraben, François ; Cardoso, João M. R. ; Covita, Daniel S. ; Dax, Andreas ; Dhawan, Satish ; Fernandes, Luis M. P. ; Giesen, Adolf ; Gouvea, Andrea L. ; Graf, Thomas ; Hänsch, Theodor W. ; Indelicato, Paul ; Julien, Lucile ; Kao, Cheng-Yang ; Knowles, Paul ; Kottmann, Franz ; Bigot, Eric-Olivier Le ; Liu, Yi-Wei ; Lopes, José A. M. ; Ludhova, Livia ; Monteiro, Cristina M. B. ; Mulhauser, Françoise ; Nebel, Tobias ; Nez, François ; Rabinowitz, Paul ; Santos, Joaquim M. F. dos ; Schaller, Lukas A. ; Schuhmann, Karsten ; Schwob, Catherine ; Taqqu, David ; Veloso, João F. C. A. ; Vogelsang, Jan ; Pohl, Randolf ; CREMA Collaboration

In: Physical Review A, 2013, vol. 88, no. 4, p. 042520

Radiative deexcitation (RD) of the metastable 2S state of muonic hydrogen and deuterium atoms has been observed. In muonic hydrogen, we improve the precision on lifetime and population (formation probability) values for the short-lived μp(2S) component, and give an upper limit for RD of long-lived μp(2S) atoms. In muonic deuterium at 1 hPa,...

Université de Fribourg

Laser spectroscopy of muonic hydrogen

Pohl, Randolf ; Antognini, Aldo ; Amaro, Fernando D. ; Biraben, François ; Cardoso, João M. R. ; Covita, Daniel S. ; Dax, Andreas ; Dhawan, Satish ; Diepold, Marc ; Fernandes, Luis M. P. ; Giesen, Adolf ; Gouvea, Andrea L. ; Graf, Thomas ; Hänsch, Theodor W. ; Indelicato, Paul ; Julien, Lucile ; Kao, Cheng-Yang ; Knowles, Paul ; Lopes, José A. M. ; Bigot, Eric-Olivier Le ; Liu, Yi-Wei ; Ludhova, Livia ; Monteiro, Cristina M. B. ; Mulhauser, Françoise ; Nebel, Tobias ; Nez, François ; Rabinowitz, Paul ; Santos, Joaquim M. F. dos ; Schaller, Lukas A. ; Schuhmann, Karsten ; Schwob, Catherine ; Taqqu, David ; Veloso, João F. C. A. ; Vogelsang, Jan ; Kottmann, Franz

In: Annalen der Physik, 2013, p. –

Muonic hydrogen (μp) is a very sensitive probe of the proton structure. Laser spectroscopy of two 2S-2P transitions in μp was used to determine both the Lamb shift and the hyperfine splitting of the 2S state in μp. The rms charge radius of the proton, inline image fm, was extracted from the Lamb shift. The Zemach radius of the proton, Rz = 1.082(37) fm, was obtained from the 2S-hyperfine...

Université de Fribourg

The Lamb shift in muonic hydrogen

Pohl, Randolf ; Antognini, Aldo ; Nez, François ; Amaro, Fernando D. ; Biraben, François ; Cardoso, João M.R. ; Covita, Daniel S. ; Dax, Andreas ; Dhawan, Satish ; Fernandes, Luis M.P. ; Giesen, Adolf ; Graf, Thomas ; Hänsch, Theodor W. ; Indelicato, Paul ; Julien, Lucile ; Kao, Cheng-Yang ; Knowles, Paul ; Bigot, Eric-Olivier Le ; Liu, Yi-Wei ; Lopes, José A.M. ; Ludhova, Livia ; Monteiro, Cristina M.B. ; Mulhauser, Françoise ; Nebel, Tobias ; Rabinowitz, Paul ; Santos, Joaquim M.F. dos ; Schaller, Lukas A. ; Schuhmann, Karsten ; Schwob, Catherine ; Taqqu, David ; Veloso, João F.C.A. ; Kottmann, Franz

In: Canadian Journal of Physics, 2011, vol. 89, p. 37-45

The long quest for a measurement of the Lamb shift in muonic hydrogen is over. Last year we measured the 2S1/2F=1–2P3/2F=2 energy splitting (Pohl et al., Nature, 466, 213 (2010)) in μp with an experimental accuracy of 15 ppm, twice better than our proposed goal. Using current QED calculations of the fine, hyperfine, QED, and finite...

Université de Neuchâtel

A large sample study of spin relaxation and magnetometric sensitivity of paraffin-coated Cs vapor cells

Castagna, N. ; Bison, G. ; Di Domenico, Gianni ; Hofer, A. ; Knowles, Paul ; Macchione, C. ; Saudan, Hervé ; Weis Antoine

In: Applied Physics B : Lasers and Optics, 2009, vol. 96, no. 4, p. 763-772

We have manufactured more than 250 nominally identical paraffin-coated Cs vapor cells (28 mm inner diameter bulbs) for multi-channel atomic magnetometer applications. We describe our dedicated cell characterization apparatus. For each cell we have determined the intrinsic longitudinal, Γ01, and transverse, Γ02, relaxation rates. Our best cell shows...

Université de Neuchâtel

Sensitivity of double-resonance alignment magnetometers

Di Domenico, Gianni ; Saudan, Hervé ; Bison, Georg ; Knowles, Paul ; Weis Antoine

In: Physical Review A, 2007, vol. 76, no. 2, p. 023407 1-10

We present an experimental study of the intrinsic magnetometric sensitivity of an optical or rf-frequency double-resonance magnetometer in which linearly polarized laser light is used in the optical pumping and detection processes. We show that a semiempirical model of the magnetometer can be used to describe the magnetic resonance spectra. Then, we present an efficient method to predict...