Two-photon photoionization of the Ca 4s3d {sup 1}D{sub 2} level in an optical dipole trap

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 photoionizes atoms in the trap because of a near-resonance with the 4s4f {sup 1}F{sub 3} level. By measuring the dipole-trap decay rate...

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Bibliographic Details
Published in:	Physical review. A, Atomic, molecular, and optical physics Vol. 71; no. 4
Main Authors:	Daily, J.E., Gommers, R., Cummings, E.A., Durfee, D.S., Bergeson, S.D.
Format:	Journal Article
Language:	English
Published:	United States 01-04-2005
Subjects:	ARGON IONS ATOMIC AND MOLECULAR PHYSICS ATOMS CALCIUM CROSS SECTIONS DECAY DIPOLES ENERGY LEVELS FOCUSING LASER RADIATION MAGNETO-OPTICAL EFFECTS MULTI-PHOTON PROCESSES PHOTOIONIZATION PHOTON-ATOM COLLISIONS PHOTONS RADIATION PRESSURE RESONANCE TRAPS WAVELENGTHS
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Summary:	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 photoionizes atoms in the trap because of a near-resonance with the 4s4f {sup 1}F{sub 3} level. By measuring the dipole-trap decay rate as a function of argon-ion laser intensity, we determine the {sup 1}F{sub 3} photoionization cross section at our wavelength to be approximately 230 Mb.
ISSN:	1050-2947 1094-1622
DOI:	10.1103/PhysRevA.71.043406