Abstract

We demonstrate two-photon bi-chromatic excitation of cold rubidium atoms in flight, using the pathway 5S1/25P3/25D5/2 with two resonant photons. In our experiment, Rb85 atoms are laser-cooled in a magneto-optical trap and launched upward in discrete clouds with a controllable vertical speed of 7.1±0.6  m/s and a velocity spread that is less than 10% of the launch speed. Outside the cooling beams, as high as 14 mm above the original center of the trap, the launched cold atoms are illuminated simultaneously by spatially localized horizontal excitation beams at 780 nm (5S1/25P3/2) and 776 nm (5P3/25D5/2). We monitor transmission of the 780-nm beam over a range of intensities of 780-nm and 776-nm light. As the center of the moving cloud passes the excitation beams, we observe as much as 97.9±1.2% transmission when the rate of two-photon absorption is high and the 5S1/2 and 5P3/2 states are depopulated, compared to 87.6±0.9% transmission if only the 780-nm beam is present. This demonstrates two-photon excitation of a launched cold-atom source with controllable launch velocity and narrow velocity spread, as a foundation for three-photon excitation to Rydberg states.

© 2017 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Excitation of Rydberg states in rubidium with near infrared diode lasers

Donald P. Fahey and Michael W. Noel
Opt. Express 19(18) 17002-17012 (2011)

Optical spectroscopy of rubidium Rydberg atoms with a 297 nm frequency-doubled dye laser

P. Thoumany, T. Hänsch, G. Stania, L. Urbonas, and Th. Becker
Opt. Lett. 34(11) 1621-1623 (2009)

Saturation of atomic transitions using subwavelength diameter tapered optical fibers in rubidium vapor

D. E. Jones, J. D. Franson, and T. B. Pittman
J. Opt. Soc. Am. B 31(8) 1997-2001 (2014)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (3)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (4)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription