题目内容
Which of the following broadening belongs to the inhomogeneous broadening? ____?
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When was the first laser invented in the world?____
Which is not a property of lasers that differs from ordinary light sources? ____?
The commonly use He-Ne laser has a wavelength of ____ nm.
The lifetime of the upper laser level in the erbium-doped fiber laser is 10 ms, and the probability of spontaneous emission is ____?
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