en عمومى General پژوهشي Research In this article, we present a specific shape of disk laser which is side-pumped by four non-symmetric hollow- ducts. The use of non-symmetric hollow duct based on two goals of the uniformity of the pump light distribution profile and the homogeneity of pump light profile through the disk. First of all we simulated the pump light distribution in the disk by using Monte-Carlo ray tracing method. Then, by using finite element analysis (FEA) method, we calculated the absorbed pump light distribution through the disk for 12%, 14% and 20% concentration of Yb+3 ions. Finally, the results of calculation have been presented. disk laser, hollow duct, Absorption efficiency, edged-pumped disk laser 49 56 http://ijop.ir/browse.php?a_code=A-10-179-1&slc_lang=en&sid=1 H. Aminpour Ph_matnava@yahoo.de 10031947532846001122 10031947532846001122 Yes Department of Physics, Karaj Branch, Islamic Azad University A. Hojabri 10031947532846001123 10031947532846001123 No Department of Physics, Karaj Branch, Islamic Azad University M. Esmaeili 10031947532846001124 10031947532846001124 No Iranian National Center for Laser Science and Technology (INLC) I. Mashaiekhy Asl2 10031947532846001125 10031947532846001125 No Iranian National Center for Laser Science and Technology (INLC)