Subnatural coherence effects in saturation spectroscopy using a single traveling wave.
We have performed zero-field level-crossing resonance measurements (nonlinear Hanle effect) in a metastable Ca atomic beam. By saturating the optical transitions (3)P(1,2) ? (3)S(1), for which the radiative linewidth is 10.5 MHz, we have recorded resonances corresponding to widths of about 31 kHz. The effect has been investigated as a function of the saturating-radiation intensity. The frequency jitter of the laser used in the measurements is about 40 times wider than the recorded widths.
Bertuccelli
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G
Beverini
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N
Galli
M
M
Inguscio
M
M
Strumia
F
F
Giusfredi
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G