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Absolute absorption on rubidium D lines : comparison between theory and experiment.

Siddons, P. and Adams, C. S. and Ge, Chang and Hughes, I. G. (2008) 'Absolute absorption on rubidium D lines : comparison between theory and experiment.', Journal of physics B : atomic, molecular and optical physics., 41 (15). p. 155004.


We study the Doppler-broadened absorption of a weak monochromatic probe beam in a thermal rubidium vapour cell on D lines. A detailed model of the susceptibility is developed which takes into account the absolute linestrengths of the allowed electric dipole transitions and the motion of the atoms parallel to the probe beam. All transitions from both hyperfine levels of the ground term of both isotopes are incorporated. The absorption and refractive index as a function of frequency are expressed in terms of the complementary error function. The absolute absorption profiles are compared with experiment, and are found to be in excellent agreement provided a sufficiently weak probe beam with an intensity under one-thousandth of the saturation intensity is used. The importance of hyperfine pumping for open transitions is discussed in the context of achieving the weak-probe limit. Theory and experiment show excellent agreement, with an rms error better than 0.2% for the D2 line at 16.5 °C.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Publisher statement:© IOP Publishing 2007
Date accepted:No date available
Date deposited:01 August 2012
Date of first online publication:2008
Date first made open access:No date available

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