20th Century
- 1900 — The Liénard–Wiechert potentials are introduced as time-dependent (retarded) electrodynamic potentials
- 1905 — Albert Einstein demonstrates that Maxwell's Equations are not required to describe electromagnetic radiation if Special Relativity is taken into account
- 1919 — Albert Michelson makes the first interferometric measurements of stellar diameters at Mount Wilson Observatory (see history of astronomical interferometry)
- 1946 — Martin Ryle and Vonberg build the first two-element astronomical radio interferometer (see history of astronomical interferometry)
- 1953 — Charles H. Townes, James P. Gordon, and Herbert J. Zeiger produce the first maser
- 1956 — R. Hanbury-Brown and R.Q. Twiss complete the correlation interferometer
- 1960 — Theodore Maiman produces the first working laser
- 1966 — Jefimenko introduces time-dependent (retarded) generalizations of Coulomb's law and the Biot-Savart law
- 1999 — M. Henny and others demonstrate the Fermionic Hanbury Brown and Twiss Experiment
Read more about this topic: Timeline Of Electromagnetism And Classical Optics
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—Hesiod (c. 8th century B.C.)