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MATERIALS TRANSACTIONS

Observation of Light-Induced Drift Effect of Rubidium by Using Two Diode Lasers for Pumping and Re-Pumping

Masaya Okamoto, Takahiro Nakamura, Shunichi Sato

Published Jan 1, 2008• 4 citations
Publisher

Abstract

The light-induced drift (LID) of rubidium was demonstrated by using two diode lasers for the pumping and re-pumping of rubidium atoms. The isotope composition ratio for 85Rb and 87Rb was estimated by measuring the absorption spectrum of the rubidium vapor.
DOI
10.2320/matertrans.mra2008193

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Optics Letters•Aug 1, 2004•20 citations
The use of paraffin-coated cells has led to a breakthrough in the experimental study of light-induced drift (LID) of alkalis in noble gases. In recent experiments isotope separation of the two naturally occurring Rb isotopes through the LID effect has been achieved (enrichment of the rare isotope up to 95%), 1,2 and direct measurements of the drift velocity of Na in noble gases as a function of various experimental parameters have been made.3 In these experiments a single single-mode dye laser, tuned within the Doppler profile of the resonance line, was used to excite a specific velocity group of atoms (isotope selective in the case of Rb). Optical pumping between the ground-state hyperfine levels F = I+½ and F=I−½ plays a dominant (limiting) role in determining the magnitude of the LID effects by strongly depleting the resonantly excited hyperfine substate (of a specific isotope).
Recently separation of the two naturally occurring Rb isotopes (28% 87Rb and 72% 85Rb) has been achieved1 using the light-induced drift (LID) effect;2 enrichment up to 95% 87Rb has been observed. In those experiments a high-power (~ 150mW) single-frequency dye laser was used. In the case of single-frequency excitation such power is required since most of the Rb atoms are trapped in the non- resonant hyperfine (hf) ground level due to optical hf pumping.3 Here we demonstrate that the Rb isotopes can be separated equally well using a low-power (3.3 mW) AlGaAs diode laser which has strong relaxation oscillation sidebands. The presence of these sidebands greatly increases LID by eliminating optical hf pumping.
Light-induced drift (LID) is a transport phenomenon in a gas mixture with dramatic manifestations such as the optical piston1 and applications in atomic isotope separation.2 The induced drift velocity is proportional to the excited state fraction, and for Na in Xe high drift velocities have been achieved using two lasers.3 Here one laser excites atoms from one hyperfine ground state and the second laser atoms from the other, avoiding hyperfine pumping. Excited in this way, the Na atom represents a Λ type three-level system, where coherent effects can be important.
The 5S1/2 --> 7S1/2 two-photon transition of atomic rubidium, which is 100 times weaker than the 5S-5D transition, is observed with an extended-cavity diode laser and a vapor cell. Signals with a signal-to-noise ratio of 280 are obtained with a laser power of 10 mW, and the observed linewidth is 3 MHz. The laser wavelength is 760 nm and is locked on the transitions to a stability of 2 x 10(-11). For the first time to our knowledge, the isotope shift of this transition is measured to be 130(4) MHz in atomic frequency.