World Science and Technology – 24

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24. The first step to getting output from a laser is to excite an active medium. What is this process called?

(a) Pumping
(b) Exciting
(c) Priming
(d) Raising

Answer
Answer : (a)
Explanation
Explanation : A collection of atoms or molecules that can be excited to a higher energy state is called an active medium. Before lasing can occur, the active media is “pumped”. The process of raising the atoms in the active media from a lower energy state to a higher state is like pumping water up from a well.
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