Is it required for a laser material to have at least three energy levels? If so, why or why not?

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Is it required for a laser material to have at least three energy levels? If so, why or why not?

Is it required for a laser material to have at least three energy levels?
If so, why or why not?
Transcribed Image Text:Is it required for a laser material to have at least three energy levels? If so, why or why not?
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