Reﬂections on the First Maser
James P. Gordon
Before the laser, there was the maser, and, before that, an idea: to build a microwave ampliﬁer using ammonia molecules. Jim Gordon takes us back to the early 1950s, when he had to decide whether Charles Townes’s vision for creating a coherent oscillator was promising enough for him to commit to for his Ph.D. project.
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