Generation of a red-green-blue laser by stimulated Raman scattering of ethanol

In this paper, we report an efficient red-green-blue (RGB) laser based on the stimulated Raman scattering (SRS) of ethanol. The wavelengths of the three-color laser are 631, 532, and 447 nm, respectively, and the gamut space that can cover is 116% of the Rec. 2020 standard gamut in the CIE1976 color space. The maximum output energy of the RGB laser was 595.9 mu J under the total pump energy of 1.56 mJ, which corresponds to an optical conversion efficiency of 38.2%. By adjusting the energy ratio of different wavelengths, a white laser output with a maximum output energy of 544.8 mu J is achieved, corresponding to a conversion efficiency of 34.9%. To the best of our knowledge, this is the first time that an RGB laser has been realized based on liquid SRS. It provides a simple, practical route for efficiently obtaining RGB and white lasers, which may find important applications in many fields like laser display, atmospheric monitoring, and medical beauty.