Keywords
21st century, absorbed, amplification, apparatus, artificial, beam, emission, emitted, equipment, excitation, excited, experiment, green beam, induced, lab, laboratory, laser, light, luminescence, luminescent, machine, no-one, nobody, optical, optics, physical, physics, radiation, re-emitted, red beam, refracted, refracting, refraction, research, ruby, ruby laser, stimulated, synthetic ruby, water, stock image, images, royalty free photo, stock photos, stock photograph, stock photographs, picture, pictures, graphic, graphics, fine art prints, print, poster, posters, mural, wall murals, u13380018