The Resonance Project
The behavior of light known as lasing is the result of quantum coherent behavior at a macroscale – it involves an astoundingly large assembly of photons all oscillating in phase, at a uniform wavelength. With the advent of lasers – which was made possible by the theoretical work of Albert Einstein in his elucidation of the photoelectric effect – the technique of holography was soon to be developed.
Read the whole article at : resonance.is/ link to original article (thanks to Justin for pointing the article out , link.)