Quantitative optical spectroscopy of ⁸⁷Rb vapour in the Voigt geometry in DC magnetic fields up to 0.4 T

Abstract

We present a detailed spectroscopic investigation of a thermal 87 Rb atomic vapour in magnetic fields up to 0.4 T in the Voigt geometry. We fit experimental spectra with our theoretical model ElecSus and find excellent quantitative agreement, with RMS errors of ∼ 0.3%. We extract the magnetic field strength and the angle between the polarisation of the light and the magnetic field from the atomic signal and find excellent agreement to within ∼ 1% with a commercial Hall probe. Finally, we present an investigation of the relative sensitivity of this technique to variations in the field strength and angle with a view to enabling atom-based high-field vector magnetometry.

Proof of the feasibility of a nanocell-based wide-range optical magnetometer

“…Let us note that optical vapor magnetometry in the Voigt configuration using a mm-long cell was reported in [26] using Stokes polarimetry [27]. Carrying out similar measurements using NC is a natural outlook of this work.…”

Absorption spectroscopy and Stokes polarimetry in a $^{87}$Rb vapour in the Voigt geometry with a 1.5 T external magnetic field

“…In an applied magnetic field of 1.5 T, the 5P 3/2 states strongly decouple into the m J , m I basis, leading to four groups of states organised by the m J = 3/2, 1/2, −1/2, −3/2 projection. Furthermore, at this magnetic field strength the ground state has a much more complete decoupling than that observed at lower field strengths [21,42,[51][52][53]56]. As such, we can treat the system as being completely in the Hyperfine Paschen-Back (HPB) regime.…”

“…Furthering the ideas and work presented in [56], we propose this as an atomic technique for measuring large magnetic fields and their relative orientation. With the system completely in the hyperfine Paschen-Back regime, the Zeeman shift presented in all the resonance line positions allows for a better determination of the magnetic field strength.…”

Features of Magnetically-induced atomic transitions of Rb D$_1$ line studied by Doppler-free method based on the second derivative of the absorption spectra

“…We show that frequency positions of spectral features and their amplitudes linked, in the weak-probe limit, with transition probabilities, are preserved with the SD technique. Such a good sub-Doppler spectral resolution allows us to identify all atomic transitions of the D 1 line of a natural mixture of Rb, and carry out quantitative measurements in strong transverse magnetic field, which was not possible in previous works because of insufficiently high spectral resolution [2,21,22]. In these works, isotopically pure vapour cells containing 87 Rb isotope had to be used.…”