Electromagnetically induced transparency in a V-system with ⁸⁷Rb vapour in the hyperfine Paschen-Back regime

Abstract

We observe electromagnetically induced transparency (EIT) in a V-system in a thermal rubidium-87 vapour in the hyperfine Paschen-Back regime, realised with a 0.6 T axial magnetic field. In this regime energy levels are no longer degenerate and EIT features from different initial states are distinct, which we show produces a much cleaner feature than without a magnetic field. We compare our results to a model using the time-dependent Lindblad master equation, and having averaged over a distribution of interaction times, see good qualitative agreement for a range of pump Rabi frequencies. Excited state decay into both ground states is shown to play a prominent role in the generation of the transparency feature, which arises mainly due to transfer of population into the ground state not coupled by the probe beam. We use the model to investigate the importance of coherence in this feature, showing that its contribution is more significant at smaller pump Rabi frequencies.

Laser spectroscopy of hot atomic vapours: from ’scope to theoretical fit

“…Also, the greatly simplified internal level structure facilitates the theoretical modelling of the system. For example, experiments conducted in atomic Rb subject to a strong magnetic field of 0.6 T generated with permanent magnets allowed for the textbook demonstration of V-EIT [176]; ladder-EIT [177]; electromagnetically induced absorption [178]; four-wave mixing [32]; and heralded single-photon generation [179]. The increased application of alkali-metal atom spectroscopy in fields of the order of a Tesla has motivated studies of generating large magnetic fields that are uniform over the vapour cell [180,181].…”

Tailoring the pulse train of an optical frequency comb with a magnetized atomic medium

“…Apparent pulse features can be seen due to the hyperfine Paschen-Back effect. As a result, the frequency interval between two adjacent magnetic sublevels with different m I values reaches 700 MHz under the magnetic field strength of 0.3 T [30], marked as σ and ρ.…”

Voigt transmission windows in optically thick atomic vapours: a method to create single-peaked line centre filters

“…By fixing T min and varying ∆ in equation (7), we expect T TW to trace out a Gaussian behaviour. The main temperature contribution is embedded in T min , which is a simple approximation to (αL) max without the need to explicitly calculate it using equation (2). A smaller T min , and therefore larger (αL) max results in a larger width at a fixed (αL) min .…”

“…Manipulation of light using magneto-optical effects is used frequently in quantum optics literature [1][2][3][4][5][6]. Popular applications include optical isolators [7,8], magnetometry [9][10][11][12] and laser frequency stabilisation [13].…”