Active laser medium

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Science and technology

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What Wikipedia says

The active laser medium (also called a gain medium or lasing medium) is the source of optical gain within a laser. The gain results from the stimulated emission of photons through electronic or molecular transitions to a lower energy state from a higher energy state previously populated by a pump source.

Excerpt from the Wikipedia article “Active laser medium”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Artem.G, CC BY-SA 4.0, via Wikimedia Commons.