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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Vol. 21, Iss. 3 — Mar. 1, 2004
  • pp: 480–485

Two-photon ionization of cold rubidium atoms

Marco Anderlini, Emmanuel Courtade, Donatella Ciampini, Jörg H. Müller, Oliver Morsch, and Ennio Arimondo  »View Author Affiliations

JOSA B, Vol. 21, Issue 3, pp. 480-485 (2004)

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Two-photon ionization cross sections from the rubidium ground state have been measured with both a cw 421-nm laser and a combination of cw 421- and 1002-nm lasers. The measurements were performed within a high-vacuum magneto-optical trap while the trapping lasers were switched off, exploiting the long trap lifetime and also the trap laser confinement. The two-photon cross sections were determined for the blue laser near resonance with the 6P1/2 and 6P3/2 states and compared with the estimates of a theoretical model. In near resonance with the 6P states, large two-photon photoionization cross sections were measured.

© 2004 Optical Society of America

OCIS Codes
(020.7010) Atomic and molecular physics : Laser trapping
(140.3320) Lasers and laser optics : Laser cooling

Marco Anderlini, Emmanuel Courtade, Donatella Ciampini, Jörg H. Müller, Oliver Morsch, and Ennio Arimondo, "Two-photon ionization of cold rubidium atoms," J. Opt. Soc. Am. B 21, 480-485 (2004)

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  3. Another important application of work with trap-loss includes molecular spectroscopy, as reviewed in Ref. 4.
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  7. In two-color, two-photon ionization, τph represents the time window during which both radiations excite the atoms.
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  9. The present ionization investigation, in which Eq. (2) was used for the evaluation of β(2), operated with Gaussian spatial distributions, as verified by the CCD images of the MOT. In the presence of a non-Gaussian distribution the spatial convolution between the laser and atomic dis-tributions described by β(2) should be evaluated numerically.
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  12. A longer MOT lifetime was measured while the trapping lasers remained switched on.
  13. P. Lambropoulos and M. R. Teague, “Two-photon ionization with spin–orbit coupling,” J. Phys. B 9, 587–603 (1974). [CrossRef]
  14. Michelle Aymar, Laboratoire Aimé Cotton, Unité Propre de Recherches 3321, Campus d’Orsay, Ba⁁t. 505 91405, Orsay Cedex, France (personal communication).

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