Experimental Demonstration of Three-Photon Coherent Population Trapping in an Ion Cloud

A novel protocol of interrogation based on coherent population trapping in an N-level scheme atomic system leads to dark resonances involving three different photons. An ensemble of several hundreds of radio-frequency trapped Ca+ ions is probed by three lasers simultaneously locked onto the same opt...

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Bibliographic Details
Published in:Physical review applied 2019-09, Vol.12 (3), Article 034035
Main Authors: Collombon, M., Chatou, C., Hagel, G., Pedregosa-Gutierrez, J., Houssin, M., Knoop, M., Champenois, C.
Format: Article
Language:English
Subjects:
Atomic Physics
Physics
Quantum Physics
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Summary:A novel protocol of interrogation based on coherent population trapping in an N-level scheme atomic system leads to dark resonances involving three different photons. An ensemble of several hundreds of radio-frequency trapped Ca+ ions is probed by three lasers simultaneously locked onto the same optical frequency comb, resulting in high-contrast spectral lines referenced to an atomic transition in the THz domain. We discuss the cause of uncertainties and limitations for this method and show that reaching a sub-kHz resolution is experimentally accessible via this interrogation protocol.
ISSN:2331-7019
2331-7019
DOI:10.1103/PhysRevApplied.12.034035