Linewidth in saturated absorption spectroscopy for two-level atoms: an empirical formula

We present an empirical formula for linewidth in saturated absorption spectroscopy for two-level atoms with cycling transition lines, taking the coherence term in the Doppler-broadened limit into account. The full width at half-maximum is obtained as (1+(1+as ) )γ , where s is the on-resonance satur...

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Bibliographic Details
Published in:Applied optics (2004) 2018-05, Vol.57 (14), p.3881
Main Authors: Moon, Geol, Noh, Heung-Ryoul
Format: Article
Language:English
Subjects:
Absorption spectroscopy
Coherence
Decay rate
Parameters
Spectrum analysis
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Summary:We present an empirical formula for linewidth in saturated absorption spectroscopy for two-level atoms with cycling transition lines, taking the coherence term in the Doppler-broadened limit into account. The full width at half-maximum is obtained as (1+(1+as ) )γ , where s is the on-resonance saturation parameter, γ is the transverse decay rate, and a and b are the parameters that depend on γ . We find that as γ increases, a and b approach 1 and 1/2, respectively. These are the typical values in the case without the coherence term.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.57.003881