TY - JOUR T1 - Studying of a novel combination of Fresnel zone plate TT - مطالعه‌ی ترکیبی جدید از تیغه‌ی منطقه‌ای فرنل JF - opsi JO - opsi VL - 21 IS - 0 UR - http://opsi.ir/article-1-596-en.html Y1 - 2015 SP - 1129 EP - 1132 KW - diffraction KW - diffracton lens KW - fzp N2 - In this article a combination of convergent and divergent Fresnel zone plat in order to increase the focal depth is examined.. It is shown that their combination is a new diffractive element with a novel diffractive properties. Transverse and longitudinal intensity distribution was studied theoretically and experimentally. The effect of the focal length and radius on the intensity distribution was investigated. Experimental works completely verify simulation results. M3 ER -