Fig. 3

Comparison between Fabry-Pérot filter model (FPM), gaussian model (G) and practical realization of a filter (P4) from [7] (FPG). The differences between these curves as integral of function difference are d(F P R,G)=36.74%, d(F P M,F P R)=9.96% and d(F P M,G) = 46.70%. The difference at FWHM, then d _σ (F P R,G)=−1.05%, d _σ (F P M,F P R)=−1.99% and d _σ (F P M,G)=−3.04%