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
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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