Evaluate the Effective of Modulation Function on Spot Size For Multifunction Modulator

Optical modulator is an important component in optical systems. The present optical modulator has been designed consisting of three concentric circles (C0, C1, C2). Each circle has different shape divided to transmittance and oblique sectors, the numbers of sectors chosen are equal to (20, 40, 60) respectively. The central circle was designed using fractal geometry with a modified program. The efficiency of this optical modulator disk was tested by applying the [MTF]( It is a function that calculate the transferee function for any modulation , in other hand it is calculation of contrast degree of the an image for any object) , and the best modulation was at spot light size equal to (2 mm 2) and it’s effective on the
modulation.