Abstract
How can we represent light? What is the nature of this apparently elusive entity? What exactly is this phenomenon produced in the Sun, carrying energy to provide warmth for us, and which can cross the empty space between galaxies and even reach us from the most distant moments of the Universe just after the Big Bang? What are these ranges of quantities and qualities used to describe it: energy, frequency, wavelength, and colour? Different descriptions of the same thing: the light we perceive with our eyes, from violet to red; the warmth of the infrared that heats our skin and the ultraviolet that can burn it; other forms of light that our senses cannot detect, such as very low energy radio waves and very high energy X-ray and gamma-ray photons. Why did it take so long to invent this special source of light we call the laser, which has become so commonplace over the last half century?
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