James Gordon, H.J. Ziegler, and Charles Hard Townes submit a short note to Physical Review
describing “[a]n experimental device, which can be used as a very high resolution microwave spectrometer, a microwave amplifier, or a very stable oscillator”—and which, in another paper a year later, they will dub the maser. The laser revolution has begun. Charles Townes pictured.
Photo Credit: Wikimedia Commons