This paper describes a rate equation model that has been formulated for an SF6saturable absorber. The model includes three transitions in theν3ladder and one hot band transition along with intramolecular V-V relaxation to the bath states. The coupled differential equations were solved using the Runge-Kutta method. The transmission characteristics have been calculated for several combinations of pulse length, cell length and SF6pressure. Theoretical values of transmission are compared with the experimental data of Haglundet al., Tayloret al.and Daidoet al., and it is found that the model explains the absorption behaviour more closely
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