Single-photon-level sub-Doppler pump-probe spectroscopy of rubidium
- URL: http://arxiv.org/abs/2007.08452v1
- Date: Thu, 16 Jul 2020 16:44:43 GMT
- Title: Single-photon-level sub-Doppler pump-probe spectroscopy of rubidium
- Authors: Paul Burdekin, Samuele Grandi, Rielly Newbold, Rowan A. Hoggarth, Kyle
D. Major, and Alex S. Clark
- Abstract summary: We propose and demonstrate pump-probe spectroscopy of rubidium absorption.
The two-dimensional spectrum measured as the laser frequencies are scanned shows fluorescence, Doppler-broadened absorption dips and sub-Doppler features.
In the future this technique could assist in frequency stabilization of lasers, and the single-photon-level probe could be replaced by a single photon source.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We propose and demonstrate pump-probe spectroscopy of rubidium absorption
which reveals the sub-Doppler hyperfine structure of the $^{5}$S$_{1/2}
\leftrightarrow$ $^{5}$P$_{3/2}$ (D2) transitions. The counter propagating pump
and probe lasers are independently tunable in frequency, with the probe
operating at the single-photon-level. The two-dimensional spectrum measured as
the laser frequencies are scanned shows fluorescence, Doppler-broadened
absorption dips and sub-Doppler features. The detuning between the pump and
probe lasers allows compensation of the Doppler shift for all atomic velocities
in the room temperature vapor, meaning we observe sub-Doppler features for all
atoms in the beam. We detail a theoretical model of the system which
incorporates fluorescence, saturation effects and optical pumping and compare
this with the measured spectrum, finding a mean absolute percentage error of
4.17\%. In the future this technique could assist in frequency stabilization of
lasers, and the single-photon-level probe could be replaced by a single photon
source.
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