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To improve the dye laser's laser output properties, (Ag nanoparticles) of various sizes were combined with Rhodamine B dye to get a higher intensity as well as a better fluorescence spectrum. It was changed the energy (500, 600, 700, 800, 900 mJ) and kept the pulse number constant at (400 P) to get various sizes of Ag NPs, where the best concentration (1x10-5 M) of RhB dye was mixed with different sizes of Ag NPs and checked the absorbance by UV-VIS spectroscopy and the fluorescence by the emission spectroscopy, and the plasmonic phenomenon in emission spectra (LIF) of Rhodamine B mixed (14000 a.u), noted that increasing the size of the Ag NPs lowers the threshold to a certain limit. [ABSTRACT FROM AUTHOR]