Spectral modification of mode structures in silver nanoparticle doped Rhodamine 6G

•Suitable pumping narrow modes (FSR~0.09 nm) are shown in a new and simple approach.•Luminescence of Rh6G is tuned in intensity, band spacing and emission wavelength.•Fluorescence enhancement of AgNP is utilized for tailoring of spectrum.•System maintains high Q value >6.4*103 over a broad range of spectral peaks.

We show in our work that very narrow (FSR ~0.09 nm) lasing modes can be formed from Rhodamine 6G solution confined within quartz (SiO2) cuvette with suitable pumping scheme by Q switched Nd:YAG laser. With introduction of silver nanoparticles of different concentrations in Rhodamine 6G we show that such lasing modes can be modulated as well as tuned in intensity, band spacing and emission wavelength. We also show that this system maintains a very high Q value >6.4*103 irrespective to change in other parameters.