Question

why four level pumping is more efficient than three level pumping​

Answer 1

Answer:

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Answer 2

Answer:

The pumping operation of a four level laser is similar to the pumping of a three level laser. This is done by a rapid population of the upper laser level (E3), through the higher energy level (E4). The advantage of the four level laser is the low population of the lower laser energy level (E2).

Explanation:

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