Coherent dark states of rubidium 87 in a buffer gas using pulsed laser light
Universität Tübingen, Physikalisches Institut, Auf der
Morgenstelle 14, 72076 Tübingen, Germany
Accepted: 11 April 1998
Published online: 15 August 1998
The coherent dark resonance between the hyperfine levels F=1, mF=0 and F=2, mF=0 of the rubidium ground state has been observed experimentally with the light of a pulsed mode-locked diode laser operating at the D1 transition frequency. The resonance occurs whenever the pulse repetition frequency matches an integer fraction of the rubidium 87 ground state hyperfine splitting of 6.8 GHz. Spectra have been taken by varying the pulse repetition frequency. Using cells with argon as a buffer gas a linewidth as narrow as 149 Hz was obtained. The rubidium ground state decoherence cross section for collisions with xenon atoms has been measured for the first time with this method using a pure isotope rubidium vapor cell and xenon as a buffer gas.
PACS: 42.50.Gy – Effects of atomic coherence on propagation, absorption, and amplification of light / 42.62.Fi – Laser spectroscopy
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1998