Development of multiple laser frequency control system for Ca+ isotope ion cooling

Abstract

We here developed and evaluated a laser frequency control system which synchronizes the laser frequency to the resonance of target Ca + isotope ion whose having more than 8 GHz of isotope shift based on the Fringe Offset Lock method for simple operation of ICPMS-ILECS (Inductively Coupled Plasma Mass Spectrometry -Ion trap Laser Cooling Spectroscopy) The system fulfilled the minimum requirements of four slave lasers stability for Doppler cooling of Ca + ions. A performance of the system was evaluated by cooling 40 Ca + ions with the stabilized slave lasers. All the stable even Ca + isotope ions were trapped and their fluorescence was observed by switching laser frequencies using the system. An odd calcium isotope 43 Ca + cooling was also succeeded by the control system.

Resonance ionisation spectrometry measurement of atomic calcium Rydberg isotope shifts

“…A computercontrolled system allows for automatic and near instantaneous feedbacking of the frequency control, resulting in highly stabilized ECDLs. Such a system is more fully described in [17] and will not be expounded on here.…”

All-diode-laser cooling of Sr+isotope ions for analytical applications

“…However, we have previously demonstrated an extended laser control system to laser-cool even and odd Ca + isotopes ions and have successfully cooled 43 Ca + having hyperfine structure. 29) We expect it will be possible for odd isotope 87 Sr + to also be laser-cooled in our apparatus should we extend our laser system.…”