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arXiv · 2302.02489

Bichromatic UV detection system for atomically-resolved imaging of ions

T. Nordmann·S. Wickenhagen·M. Doležal·T. E. Mehlstäubler
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Abstract

We present a compact and bichromatic imaging system, located outside of the vacuum chamber of a trapped ion apparatus, that collects the fluorescence of 230.6 nm and 369.5 nm photons simultaneously on a shared EMCCD camera. The system contains two lens doublets, consisting of a sphere and an asphere. It provides a numerical aperture of 0.45 and 0.40 at 230.6 nm and 369.5 nm, respectively, and enables spatially resolved state detection with a large field of view of 300 $\mu$m for long $^{115}$In$^+$/$^{172}$Yb$^+$ Coulomb crystals. Instead of diffraction limited imaging for one wavelength, the focus in this system is on simultaneous single-ion resolved imaging of both species over a large field with special attention to the deep UV wavelength (230.6 nm) and the low scattering rate of In$^+$ ions. The introduced concept is applicable to other dual-species applications.

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T. Nordmann, S. Wickenhagen, M. Doležal, T. E. Mehlstäubler. 2023-02-05. Bichromatic UV detection system for atomically-resolved imaging of ions. https://doi.org/10.1063/5.0145409

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