Observation of Magnetically-Induced atomic transitions of the 133Cs 6s 2S1/2 →  7p 2P3/2 line at 456 nm

It has recently been demonstrated that magnetically induced (MI) transitions, a class of transitions forbidden at zero magnetic field, of the 133 Cs 6s 2 S 1/2 → 6p 2 P 3/2 (D 2 ) line, exhibit promising features for high-resolution physics applications in the near-infrared range. In this work, we study a group of seven MI transitions ( F g = 3 → F e = 5 ) of the 133 Cs 6s 2 S 1/2 → 7p 2 P 3/2 line at λ = 456 nm. The experimental measurements are in very good agreement with theoretical predictions based on the diagonalization of the Zeeman Hamiltonian. In magnetic fields ranging from 0.2 − 3.4 kG, these transitions reach a maximum intensity above that of conventional transitions. Another noteworthy property is their large frequency shift, reaching approximately 17 GHz with respect to the unperturbed hyperfine transitions in magnetic fields of about 3 kG. These interesting properties may prove useful for the realization of optical frequency references or magnetometers with sub-micron spatial resolution in the blue region of the spectrum.