The ammonia maser: dynamics in a two-state system with a time-dependent Hamiltonian.

氨量子微波激射器：在哈密顿量含时情况下一个双态系统的动力学情况。

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A maser is a collection of molecules — in this case, water — that amplifies light into a powerful beam.

一个脉泽就是一组分子(在这个话题下就是水分子)，它会把光线放大为强大的光束。

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We call it a mega-maser.

我们叫它巨型脉泽。

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Before the laser, scientists developed a similar device: a maser which stands for Microwave Amplification by Stimulated Emission of Radiation.

VOA: special.2010.09.01

Originally an adaptation of an earlier device called a maser - an electronic oscillator that operated at very high radio frequencies - the laser was first demonstrated by Theodore Maiman in 1960.

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