Cold Atoms
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Power Broadening and Doppler Effects of Coherent Dark Resonances in Rb
Michael Erhard, Stefan Nußmann, and Hanspeter Helm
Department of Molecular and Optical Physics, Albert-Ludwigs-Universität, Hermann-Herder-Strasse 3, D-79104  Freiburg, Germany

Abstract:


Using a phase-locked laser pair we have observed dark resonances with linewidths below 30 Hz in a rubidium cell filled with neon as buffer gas. A model allowing for pressure broadening correctly reproduces the dependence of the width on the laser intensity. Consideration of velocity changing collisions reveals the absence of Doppler effects in the position and width of the dark resonance at high buffer-gas pressure. ©2000 The American Physical Society


©2000 Phys. Rev. A , 62, 061802-1 (2000)

URL: http://link.aps.org/abstract/PRA/v62/e061802
DOI: 10.1103/PhysRevA.62.061802
PACS: 42.50.Gy, 32.80.Qk, 32.70.Jz


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