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This paper reports on photoionisation loading based on ultrafast pulses ofsingly-ionised strontium ions in a linear Paul trap. We take advantage of anautoionising resonance of Sr neutral atoms to form Sr+ by two-photon absorptionof femtosecond pulses at a wavelength of 431nm. We compare this technique toelectron-bombardment ionisation and observe several advantages ofphotoionisation. It actually allows the loading of a pure Sr+ ion cloud in alow radio-frequency voltage amplitude regime. In these conditions up to 4x10^4laser-cooled Sr+ ions were trapped.

Photoionisation loading of large Sr+ ion clouds with ultrafast pulses