题目内容

The lifetime of the upper laser level in the erbium-doped fiber laser is 10 ms, and the probability of spontaneous emission is ____?

A. 100 s-1
B. 10 s-1
C. 0.1 s-1
D. 10 ms-1

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____ is the inventor of the first laser in the world?

A. Townes
B. Maiman
C. Schawlow
D. Albert Einstein

When was the first laser invented in my China?____

A. 1960 year
B. 1962 year
C. 1961 year
D. 1963 year

The commonly use Nd:YAG has a wavelength of ____ nm.

A. 1064 nm
B. 694.3 nm
C. 10.6μm
D. 632.8 nm

The lifetime of the upper laser level in the Nd:YAG laser is 230μs, and the probability of spontaneous emission is ____?

A. 100 s-1
B. 10 s-1
C. 0.1 s-1
D. 4.35 ms-1