Eng Aik Chan, Syed Abdullah Aljunid, Athanasios Laliotis, David Wilkowski, Martial Ducloy
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Doppler-free selective reflection spectroscopy of electric-quadrupole transitions.
Electric-dipole-forbidden transitions play an important role in quantum sensing, quantum information, and fundamental tests in physics. As such, the development of novel and sensitive spectroscopic methods is of major interest. Here, we present a Doppler-free selective reflection experiment on the 62S1/2-52D5/2 electric-quadrupole transition of cesium vapor at the vicinity of a sapphire window. The spectrum is obtained by precision experiments overcoming limitations due to the small-signal amplitude of forbidden transitions. The observed sub-Doppler lines allow us to measure the collisional broadening of the electric-quadrupole line. The interaction of cesium atoms with the sapphire surface of the cell is also evidenced, but, due to its weak contribution, a quantitative analysis remains challenging. Our experiment paves the way for further studies of the Casimir-Polder interaction between exotic excited-state atoms and dielectric surfaces.
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The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community.
Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.
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