Coulomb crystals consisting of isotopically pure magnesium ions are build employing a new tunable continuous-wave (CW) laser light source: Mg atoms are isotope-selective ionized by resonant two-photon excitation at a wavelength of 285.3 nm. The UV laser light is generated via resonant second-harmonic generation of the output of a new CW laser C-WAVE that offers about 0.5 W single-frequency output power that is tunable in the range 450–650 nm. The created Mg ions are trapped and cooled, building 2D Coulomb crystals which are used for further investigation. 

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