Absorption spectroscopy for laser cooling and high-fidelity detection of barium monofluoride molecules

Rockenhäuser, Marian; Kogel, Felix; Pultinevicius, Einius; Langen, Tim

doi:10.1103/physreva.108.062812

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2024

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Cited by 8 publications

(1 citation statement)

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“…Two-photon spectroscopy could be a viable alternative to cancel out the Doppler effect. − A recent study by Miyabe et al established the optical configuration employing resonance-enhanced two-photon spectroscopy to observe fluorescence for calcium isotope analysis. The constructed system could successfully mitigate the line broadening while providing an intense signal.…”

Section: Introductionmentioning

confidence: 99%

Laser Ablation Saturated Absorption Spectroscopy (LA-SAS) for In Situ Detection of Neodymium Isotopes

Choi,

Jo,

Yun

2024

Anal. Chem.

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Section: Introductionmentioning

confidence: 99%

Laser Ablation Saturated Absorption Spectroscopy (LA-SAS) for In Situ Detection of Neodymium Isotopes

Choi,

Jo,

Yun

2024

Anal. Chem.

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Quantum state manipulation and cooling of ultracold molecules

Langen,

Valtolina,

Wang

et al. 2024

Nat. Phys.

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A method to determine the phase-space distribution of a pulsed molecular beam

Mooij,

Bethlem,

Boeschoten

et al. 2024

J. Phys. B: At. Mol. Opt. Phys.

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We demonstrate a method to determine the longitudinal phase-space distribution of a cryogenic buffer gas cooled beam of barium-fluoride molecules based on a two-step laser excitation scheme. Temporal resolution is achieved by a transversely aligned laser beam that drives molecules from the ground state $X^2\Sigma^+$ to the $A^2\Pi_{1/2}$ state around 860\;nm, while the velocity resolution is obtained by a laser beam that is aligned counter-propagating with respect to the molecular beam and that drives the Doppler shifted $A^2\Pi_{1/2}$ to $D^2\Sigma^+$ transition around 797\;nm. Molecules in the $D$-state are detected background-free by recording the fluorescence from the $D-X$ transition at 413 nm. A temporal resolution of 11\;$\upmu$s and a velocity resolution of 6\;m/s is obtained. In order to calibrate the absolute velocity, we have determined the Doppler free transition frequencies for the $X-A$ and $X-D$ transitions with an absolute accuracy below 0.3\;MHz. The high resolution of the phase-space distributions allows us to observe a variation of the average velocity and velocity spread over the duration of the molecular beam pulse. Our method hence gives valuable insight into the dynamics in the source.

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Absorption spectroscopy for laser cooling and high-fidelity detection of barium monofluoride molecules

Cited by 8 publications

References 53 publications

Laser Ablation Saturated Absorption Spectroscopy (LA-SAS) for In Situ Detection of Neodymium Isotopes

Laser Ablation Saturated Absorption Spectroscopy (LA-SAS) for In Situ Detection of Neodymium Isotopes

Quantum state manipulation and cooling of ultracold molecules

A method to determine the phase-space distribution of a pulsed molecular beam

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