A prism, according to Merriam-Webster.com, is defined as a transparent body that is bounded in part by two nonparallel plane faces and is used to refract or disperse a beam of light. A prism disperses a single beam of white light into the distinct color streams that form the light. It is a thing of wonder and beauty; but at its core, a prism lacks heat. It lacks energy. It is pretty, but it has no real power.
Lasers, on the other hand, amplify light. They emit a single wavelength of color, determined by the amount of energy released during the amplification process. Lasers are focused. They create heat and energy. They are concentrated sources of light that have power.