Random Raman laser of Rhodamine 6G dye containing ZnO nanospheres

Abstract The inability to achieve predictable lasing modes is one of the main challenges in random laser developing and applications. In this study, emission spectra of Rhodamine 6G containing ZnO nanospheres under intense pump energy, present reproducible peak wavelengths for subsequent excitation pulses. Random Raman lasing could be responsible for these spectral lines. Random laser radiation promotes Raman lines appearance when their spectral location overlaps with the random laser spectrum. It is found that narrow Raman mode lasing at 573, 575, 578, 580, and 583 nm with FWHM about 0.6 nm triggered by stimulated Raman scattering. The present study highlights that random lasing and stimulated Raman scattering coupling gives a possibility to design the random lasers with tunable wavelengths and this effect makes them suitable for the manufacturing of optical devices in the future. Moreover, this coupling effect is useful for the improvement of Raman spectroscopy efficiency and its spectroscopy applications.