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

Abstract

We show that the Second Derivative (SD) technique of the absorption spectra of Rb atomic vapours confined in a nanocell with a thickness $\ell =\lambda /2=398$ nm allows to achieve close to Doppler-free spectroscopy. Narrow linewidth and linearity of the SD signal response with respect to transition probabilities allow us to study separately, in an external transverse magnetic field (0.6 to 4 kG), a big number of the atomic transitions of ${}^{85}$Rb and ${}^{87}$Rb atoms. Atomic transitions $|F_g,0⟩\to |F_e=F_g,0^{\prime }⟩$, for which the dipole moment is null at zero magnetic field (so-called magnetically-induced transitions), show a gigantic increase in probability with increasing magnetic field. When a magnetic field is applied on the vapour, we show the possibility of forming a dark resonance on these transitions by adding a coupling laser. We hence demonstrate a five-fold increase in the transmission of the probe radiation when the coupling laser is on. Theoretical calculations are in a very good agreement with experimental results.

arXiv comment15 pages, 8 figures

References in corpus (20)

• Resonant nonlinear magneto-optical effects in atoms
• The cooperative Lamb shift in an atomic nanolayer
• Hyperfine Paschen-Back regime realized in Rb nanocell
• Saturated-absorption spectroscopy revisited: atomic transitions in strong magnetic fields ($>$20 mT) with a micrometer-thin cell
• The hyperfine Paschen-Back Faraday effect
• Decoupling of hyperfine structure of Cs $D_1$ line in strong magnetic field studied by selective reflection from a nanocell
• Giant modification of atomic transitions probabilities induced by magnetic field: forbidden transitions become predominant
• Fabrication and characterization of super-polished wedged borosilicate nano-cells
• Four-wave mixing in a non-degenerate four-level diamond configuration in the hyperfine Paschen-Back regime
• Optical transmission of an atomic vapor in the mesoscopic regime
• Proof of the feasibility of a nanocell-based wide-range optical magnetometer
• Study of forbidden atomic transitions on $D_2$ line using Rb nano-cell placed in external magnetic field
• Dark resonance formation with magnetically-induced transitions: extension of spectral range and giant circular dichroism
• Collapse and revival of a Dicke-type coherent narrowing in potassium vapor confined in a nanometric-thin cell
• Quantitative optical spectroscopy of ${}^{87}$Rb vapour in the Voigt geometry in DC magnetic fields up to 0.4T
• Hyperfine Paschen-Back regime of Potassium D${}_2$ line observed by Doppler-free spectroscopy
• Magnetic field--induced modification of selection rules for Rb D${}_2$ line monitored by selective reflection from a vapor nanocell
• Simultaneous two-photon resonant optical laser locking (STROLLing) in the hyperfine Paschen--Back regime
• Selective reflection from a Potassium atomic layer with a thickness as small as $\lambda /13$
• Low-drift Zeeman shifted atomic frequency reference

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