RT - Journal Article T1 - Estimated the number of nanoparticles in an active medium using random laser theory JF - opsi YR - 2014 JO - opsi VO - 20 IS - 0 UR - http://opsi.ir/article-1-230-en.html SP - 1325 EP - 1328 K1 - multiple scattering K1 - transfer matrix method K1 - random laser K1 - random active medium. AB - In this paper a theoretical method to estimate the number of scattering nanoparticles in an active medium based on random laser theory is introduced. Our sample includes an active medium and the nanoparticles are distributed randomly in it. The sample pumped optically and cause of multiple scattering, random laser can occur. The output emission of the sample with a transfer matrix method is studied. Then the statistical behavior of its emission spectrum is calculated. The results of our simulation shows that the number of nanoparticles can be estimated from the statistical random laser output emission and averaged lasing wavelength. LA eng UL http://opsi.ir/article-1-230-en.html M3 ER -