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Japanese Journal of Applied Physics

Trapping of Ca+ Ions and Optical Detection

Shinji Urabe, Hidetsuka Imajo, Kazuhiro Hayasaka, Masayoshi Watanabe

Published Aug 1, 1991• 4 citations
Publisher

Abstract

A medium-sized rf ion trap is developed, and stored Ca+ ions are optically detected. Weak fluorescence from Ca+ ions is detected using a frequency-doubled Ti:sapphire laser and the photon counting method. The temperature and number of stored ions are estimated from the measured spectrum of the ions and the spatial distribution of the ion cloud.

DOI
10.1143/jjap.30.l1532

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A medium-sized rf ion trap is developed, and stored Ca+ ions are optically detected. Weak fluorescence from Ca+ ions is detected using a frequency-doubled Ti:sapphire laser and the photon counting method. The temperature and number of stored ions are estimated from the measured spectrum of the ions and the spatial distribution of the ion cloud.
Ba+ and Yb+ ions were trapped with buffer gas in a rf ion trap. The number and the storagetime of the trapped ions were determined by the rf resonance method. It was shown thatthe motion of the trapped ions was expressed by an external forced oscillation equation with anonlinear term in the case the fabricated trap was imperfect. Due to this nonlinear effect, thesubharmonic oscillation was induced, and thus the number and the storage time of the trappedions were decreased and shortened, respectively. The temperature and the spatial distributionof the trapped ions were determined by the fluorescence detection method.
A cloud of laser-cooled 40 Ca + is successfully trapped and manipulated under well control in our home-built linear ion trap, which is designed and constructed solely for studying quantum information processing. By exploring the variation of the ion cloud with respect to the trap parameters, we have optimized the trapping condition and obtained very good fluorescence spectra. We observe the dynamics of the ion cloud, and estimate the temperature of the ion cloud to be of the order of milli-Kelvin.
In order to exploit the capability of a high-Q transition for a frequency standard in the optical domain (729 nm), a stored Ca+ ion cloud in a medium-size ion trap is investigated. Long confinement times are obtained in the presence of helium as a buffer gas in the range 10-6-10-8 mbar and at a pseudopotential well depth of 62 eV. First observations of the electric quadrupole line were achieved by direct excitation of one of the first metastable doublet levels (τ≈1 s). Utilisation of a grating-stabilised diode laser in order to probe both levels when only one level is initially populated allows us to observe almost equal fluorescence intensities of both forbidden lines that show the presence of a strong fine structure mixing which exists in addition to quenching.