Temperature dependence of the excited- state absorption of alexandrite

The temperature dependence from 28 to 290°C of the excited-state absorption cross section
\sigma_{2a}(E)
in the gain wavelength region of alexandrite has been determined from the temperature dependence of the single pass gain (SPG) and of the fluorescence.
\sigma_{2a}(E)
and the emission cross section increase with temperature at approximately the same rate.