TY - JOUR T1 - Improvement of all-optical switching performance based on azo dye-doped polymer film using two pump beams in two step TT - بهبود عملکرد سوئیچ تمام اپتیکی فیلم پلیمری حاوی رنگینه DR1 با استفاده از دو پرتو پمپ JF - opsi JO - opsi VL - 20 IS - 0 UR - http://opsi.ir/article-1-449-en.html Y1 - 2014 SP - 1469 EP - 1472 KW - All-optical switching KW - Azo dye KW - poly methyl methacrylate (PMMA) films KW - two pump beams N2 - Pumping poly methyl methacrylate (PMMA) films doped with azobenzene chromophore Disperse Red 1 (DR1) with two pump beams in two step, all-optical switching effects with very low background and high stability are demonstrated. For comparison, we used respectively the single linearly polarized beam (9 mW),linear–circular polarized beams (9mW and 4.9 mW) and two cross-linearly polarized beams (9 mW and 3.3 mW) to pump the film. High frequency switching is obtained, Because the experimental measurement and analysis showed that the turn off speed of the all-optical switching could be obviously increased by use of two pump beam method. M3 ER -