Use of an electricdipole forbidden transition to optically probe the Autler Townes effect
Abstract
We study the Autler Townes (AT) effect derived from a strong electric dipole transition stimulated by a resonant laser beam and probing it by means of a weak electric quadrupole transition with a controlled frequency detuning in a ladder configuration. The experiment was carried out for a $^{87}$Rb atomic gas at room temperature in a velocityselective scheme. The AT effect was monitored via the splitting of the fluorescence spectra associated with the spontaneous decay to the ground state. The theoretical description incorporates the modification of standard fewlevel schemes introduced by forbidden electricdipole transitions selection rules. We develop an analytic ladder threelevel scheme to approximate the cyclic $5\mathrm{S}_{1/2} \mathrm{F}=2\rightarrow 5\mathrm{P}_{3/2} F=3 \rightarrow 6\mathrm{P}_{3/2} \mathrm{F}=1,2,3\rightarrow 5 \mathrm{S}_{1/2}\mathrm{F}=2$ path. Other levels that could have effects on the fluorescence are included via a fourth level with effective parameters. Doppler effects and finite bandwidths of the laser beams are included in the theoretical model to closely reproduce the experimental results.
 Publication:

arXiv eprints
 Pub Date:
 September 2019
 DOI:
 10.48550/arXiv.1909.01293
 arXiv:
 arXiv:1909.01293
 Bibcode:
 2019arXiv190901293R
 Keywords:

 Physics  Atomic Physics;
 Quantum Physics
 EPrint:
 27 pages, 11 figures