Abstract

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 $(1+{(1+a{s}_0)}^b){\gamma }_t$, where $s_0$ is the on-resonance saturation parameter, ${\gamma }_t$ is the transverse decay rate, and $a$ and $b$ are the parameters that depend on ${\gamma }_t$. We find that as ${\gamma }_t$ increases, $a$ and $b$ approach 1 and 1/2, respectively. These are the typical values in the case without the coherence term.

© 2018 Optical Society of America

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