Université de Fribourg

Measurement of longitudinal and transverse spin relaxation rates using the ground-state Hanle effect

Castagna, Natascia ; Weis, Antoine

In: Physical Review A - Atomic, Molecular and Opical Physics, 2011, vol. 84, no. 5, p. 053421

We present a theoretical and experimental study of the resonant circularly-polarized-light-induced Hanle effect in the ground state of Cs vapor atoms in a paraffin-coated cell. The effect manifests itself as a narrow resonance (centered at B=0) in the dependence of the optical transmission coefficient of the vapor on the magnitude of an external magnetic field B⃗. We develop a theoretical model...

Université de Fribourg

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

Castagna, Natascia ; Bison, Georg ; Di Domenico, Gianni ; Hofer, Adrian ; Knowles, Paul ; Macchione, Catherine ; Saudan, Hervé ; Weis, Antoine

In: Applied Physics B, 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, Γ ₀₁, and transverse, Γ ₀₂, relaxation rates. Our best cell shows Γ...

Université de Fribourg

Laser-driven Cs magnetometer arrays for magnetic field measurement and control

Knowles, Paul ; Bison, Georg ; Castagna, Natascia ; Hofer, Adrian ; Mtchedlishvili, A. ; Pazgalev, Anatoly S. ; Weis, Antoine

In: Nuclear Instruments and Methods in Physics Research Section A, 2009///doi: 10.1016/j.nima.2009.07.079

High precision mapping of weak magnetic fields is of interest for several branches of pure and applied research. This paper presents a resume of the progress made at Fribourg in adapting laboratory style laser-pumped optical Cs magnetometers to multisensor field mapping problems. Progress has been made in sensor head design and manufacture, laser beam splitting and control, and signal treatment...

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3 Castagna, N.