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Two-photon photo-ionization of the Ca 4s3d 1D2 level in an optical dipole trap

J. E. Daily·R. Gommers·E. A. Cummings·D. S. Durfee·S. D. Bergeson
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Abstract

We report an optical dipole trap for calcium. The trap is created by focusing a 488 nm argon-ion laser beam into a calcium magneto-optical trap. The argon-ion laser photo-ionizes atoms in the trap because of a near-resonance with the 4s4f 1F3 level. By measuring the dipole trap decay rate as a function of argon-ion laser intensity, we determine the 1F3 photo-ionization cross section at our wavelength to be approximately 230 Mb.

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J. E. Daily, R. Gommers, E. A. Cummings, D. S. Durfee, S. D. Bergeson. 2005-01-04. Two-photon photo-ionization of the Ca 4s3d 1D2 level in an optical dipole trap. https://doi.org/10.1103/physreva.71.043406

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