Saturation effects in the sub-Doppler spectroscopy of cesium vapor confined in an extremely thin cell

摘要: Saturation effects affecting absorption and fluorescence spectra of an atomic vapor confined in extremely thin cell (cell thickness $Ll1\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{m}$) are investigated experimentally theoretically. The study is performed on the ${D}_{2}$ line $(\ensuremath{\lambda}=852\phantom{\rule{0.3em}{0ex}}\mathrm{nm})$ Cs concentrates two situations $L=\ensuremath{\lambda}∕2$ $L=\ensuremath{\lambda}$, most contrasted ones with respect to length dependence coherent Dicke narrowing. For $L=\ensuremath{\lambda}∕2$, Dicke-narrowed profile simply broadens saturates amplitude when increasing light intensity, while for sub-Doppler dips reduced at line-center appear broad profile. a detection saturation induces narrow dips, but only hyperfine components undergoing population loss through optical pumping. These experimental results interpreted help various existing models compared numerical calculations based upon two-level modeling that considers both closed open system.