Keywords
21st century, amplification, beam, emission, experiment, fibre optics, glass, green beam, lab, laboratory, laser, light, no-one, nobody, optical, optical fibre, optics, physical, physics, radiation, research, stimulated, test tube, tir, total internal reflection, 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, u43700122