Abstract
A two step excitation scheme in hot atomic sodium vapor is experimentally investigated. The observed effects reflect a coupling between the 32S, 32P and the 32D states. We present the relative dependence on detuning of the two utilized lasers around λ = 589 nm and 819 nm. Unlike expected, we achieve a higher detuning dependence of the probe and the coupling laser by a factor of approximately three. The presented work aimed for a Rydberg excitation and quantum light storage. Such schemes are usually implemented with a red laser on the D-line transition and a coupling laser of shorter (typically blue) wavelength. Due to the fact that higher P-Rydberg states are approximately two times higher in energy than the 32D state, a two photon transition from the atomic excited 32P state to a Rydberg P state is feasible. This might circumvent laser frequency doubling whereby only two lasers might mediate a three photon process. The scheme of adding three k-vectors allows for electromagnetically induced transparency experiments in which the resulting k-vector can be effectively reduced to zero. By measurements utilizing electric fields and an analysis of the emission spectrum of the atomic vapor, we can exclude the excitation of the P-P two photon transition.
Highlights
Atomic vapors allow for highly coherent spectroscopic experiments, which are even accessible in Doppler broadened hot atomic vapor cells[1]
In preparation to experiments involving a Rydberg excitation of hot atomic sodium vapor, we perform experiments in which the hot gas is excited with the common D-line transitions around 589 nm and around 819 nm
The first set of experiments are a recording of the absorption spectrum of the hot atomic sodium vapor as a reference
Summary
Atomic vapors allow for highly coherent spectroscopic experiments, which are even accessible in Doppler broadened hot atomic vapor cells[1]. Since the turn of the 21st century, multilevel step-wise (ladder scheme) excitations towards Rydberg states in atomic vapors, have garnered much attention. These equivalently allow for high coherence, between an alkali P state and a higher order state[13,14]. Few experiments on atomic sodium with ladder scheme excitations have been performed These do not necessarily aim for the observation of EIT, but aim for experimental www.nature.com/scientificreports/. In preparation to experiments involving a Rydberg excitation of hot atomic sodium vapor, we perform experiments in which the hot gas is excited with the common D-line transitions around 589 nm and around 819 nm. This transition is approximately mid-way between the 32P state and the Rydberg states close to the ionization threshold
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