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Journal of Modern Optics

Optical Detection of Stored Ca+

Shinji Urabe, Hidetsuka Imajo, Kazuhiro Hayasaka, Masayoshi Watanabe

Published Feb 1, 1992• 6 citations
Publisher

Abstract

This paper describes the results of optical detection of Ca+ ions stored in an rf ion trap by using a frequency-doubled Ti: sapphire laser and a laser diode. Some experimental results of the characteristics of the stored ions are shown.
DOI
10.1080/09500349214550411

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This paper describes our recent experimental results on trapping and laser cooling of Ca+ ions. The measurement of the characteristics of laser-cooled Ca+ ions in an rf quadrupole ion trap, such as the fluorescence line shape and phase transition, is described. Observation of two types of collision-induced “quantum jumps” of a Ca+ ion in a background gas of H2 or air is also described. Since the rate of the collision-induced jumps is very high for Ca+, it is necessary to achieve an extremely high vacuum condition for frequency standard applications.
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.