Two-photon spectroscopy of trapped HD+ ions in the Lamb-Dicke regime

V.Q. Tran, J.-P. Karr, A. Douillet, J.C.J. Koelemeij, L. Hilico

Research output: Contribution to JournalArticleAcademicpeer-review


We study the feasibility of nearly degenerate two-photon rovibrational spectroscopy in ensembles of trapped, sympathetically cooled hydrogen molecular ions using a resonance-enhanced multiphoton dissociation (REMPD) scheme. Taking advantage of quasicoincidences in the rovibrational spectrum, the excitation lasers are tuned close to an intermediate level to resonantly enhance two-photon absorption. Realistic simulations of the REMPD signal are obtained using a four-level model that takes into account saturation effects, ion trajectories, laser frequency noise, and redistribution of population by blackbody radiation. We show that the use of counterpropagating laser beams enables optical excitation in an effective Lamb-Dicke regime. Sub-Doppler lines having widths in the 100-Hz range can be observed with good signal-to-noise ratio for an optimal choice of laser detunings. Our results indicate the feasibility of molecular spectroscopy at the 10
Original languageEnglish
Pages (from-to)033421
Number of pages15
JournalPhysical Review A. Atomic, Molecular and Optical Physics
Issue number3
Publication statusPublished - 2013


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