The rare-earth-doped fiber lasers have spectral line-width in the rang

1.	The rare-earth-doped fiber lasers have spectral line-width in the range of ________________?
A.	0.1 to 1 nm
B.	1.2 to 1.5 nm
C.	6 to 10 nm
D.	2 to 2.3 nm
Answer» B. 1.2 to 1.5 nm

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