Single-photon-level sub-Doppler pump-probe spectroscopy of rubidium
| Autor: | Burdekin, Paul, Grandi, Samuele, Newbold, Rielly, Hoggarth, Rowan A., Major, Kyle D., Clark, Alex S. |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Phys. Rev. Applied 14, 044046 (2020) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevApplied.14.044046 |
| Popis: | 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. Comment: 5 page paper, 4 page supplemental material. Comments welcome |
| Databáze: | arXiv |
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