Isotope-selective trapping of rare calcium ions using high-power incoherent light sources for the second step of photo-ionization

Doppler-free Yb spectroscopy with the fluorescence spot technique

“…Knowledge of the 1 S 0 ↔ 1 P 1 transition line in atomic Yb and of the corresponding frequency shifts for the stable isotopes is very important in these experiments as it allows for laser cooling and isotope selective photoionisation [20,22,[25][26][27]. Various methods have been used to investigate these transitions and the corresponding isotope shifts [28][29][30][31][32].…”

Observation of single Ca+ ions for trace isotope analysis

“…As for calcium, 40 Ca is the dominant isotope ( 40 Ca/ Ca = 96.9%), and it is not easy to efficiently separate the other isotopes [19]. Usually selective photoionization loading is employed to observe the Ca isotopes [24][25][26]. As 41 Ca has nuclear spin because of the odd isotope, hyperfine structures of laser cooling and repumping transitions should be considered along with 43 Ca [24,26].…”

Two-color photoionization of calcium using SHG and LED light

“…Although the excitation of Rydberg states is the bottleneck of the scheme, sufficiently high loading rates to trap clouds of various calcium isotopes, e.g. 43 Ca + , were reached in [11,12] using two high-power LEDs in a double-pass imaging configuration.…”

“…The experience with a sub-threshold 390nm-laser [4] and light emitting diodes [11,12] also led us to implementing the second excitation step from the 1 P 1 -state into the continuum with a high-power LED and a custom designed optical system. The two systems will be described in more detail in the following sections.…”