Velocity-selective double resonance in Doppler-broadened rubidium vapor

N. Vujičić, T. Ban, G. Kregar, D. Aumiler, and G. Pichler
Phys. Rev. A 87, 013438 – Published 31 January 2013

Abstract

We study resonantly enhanced cascaded two-photon transitions in Doppler-broadened rubidium vapor, induced by an optical frequency comb. Cascaded two-step excitation of atoms from the ground state 5S1/2 to the final 5D5/2 state via an intermediate 5P3/2 state as well as the influence of the frequency comb repetition rate on the two-photon fluorescence signal have been investigated. It is shown that the careful choice of fR leads to enhancement of the two-photon signal with considerable increase of the final 5D5/2-state population due to velocity-selective double resonance. Since the double-resonance condition for two different rubidium isotopes is fulfilled for different fR, the possibility of isotope-selective two-photon excitation is explored. The dependence of the two-photon signal on external magnetic field values and different repetition rates of the optical frequency comb is also investigated.

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  • Received 7 November 2012

DOI:https://doi.org/10.1103/PhysRevA.87.013438

©2013 American Physical Society

Authors & Affiliations

N. Vujičić, T. Ban, G. Kregar, D. Aumiler, and G. Pichler

  • Institute of Physics, Bijenička 46, HR-10 000 Zagreb, Croatia

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Vol. 87, Iss. 1 — January 2013

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