TY - JOUR ID - TI - Effect of thickness on the fractal optical modulator for MgF2,LiF, AL2O3 materials by testing modulation transfer function (MTF) AU - Abbas SH. Alwan AU - Mohammed L. Jabbar AU - Falah H. Hanoon PY - 2017 VL - 7 IS - 4 SP - 168 EP - 182 JO - Journal of Education for Pure Science مجلة التربية للعلوم الصرفة SN - 20736592 AB - Abstract:The optical modulator or chopper is an important component in optical systems. It is a device,which changes the angle between the vision line of the target and the coordinate of an electricalsignal. This paper has been designed as a new model of the fractal optical modulator. A new opticalmodulator involves two cycles (inner and outer). Each cycle of them consists of eighteen sections. Itis known that the sections of the optical modulator become two parts, nine sections considered aretransparent and the other sections are opaque to light. There are two parameters have taken to designthe optical modulator, first factor is the shape and second factor is the section number. A new opticalmodulator is made from three materials such as (Magnesium Fluoride (MgF2), Lithium Fluoride(LiF) and Sapphire (Al2O3) by using the fractal function. So an optical modulator is created bybuilding a computer program using the visual basic language. For the importance of the modulationtransfer function (MTF) in testing and evaluating optical systems, the dependent measurement isdone to know the optical systems efficiency. It has been studied the optical systems with a circularaperture, where that function could be evaluated the image efficiency for point object of image planeat different magnitude of the wavelength and thickness. In this research, the fractal optical modulatorhas been designed of insulator material by using the fractal function. It has been evaluated the valuesof MTF at different values of the wavelength and thickness. Also, we studied the relation betweenspatial frequency and number of sections, as well.

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