Rugate filters are a special kind of graded-index films that may provide advantages in both, optical performance and
mechanical properties of the optical coatings. In this work, design and optimization of a high reflection rugate filter
having reflection peak at 540nm has been presented which has been further optimized for side-lobe suppression. A
suitable number of apodization and matching layers, generated through Quintic function, were added to the basic
sinusoidal refractive index profile to achieve high reflectance of around 80% in the rejection window for normal
incidence. Smaller index contrast between successive layers in the present design leads to less residual stress in the thinfilm
stack which enhances the adhesion and mechanical strength of the filter. The optimized results show excellent side
lobe suppression achieved around the stopband.