Active laser medium

（重定向自Laser medium）

Fig.1. Simplified scheme of levels a gain medium.

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

单词	Laser medium
释义	Laser medium 英语百科 Active laser medium （重定向自Laser medium） The active laser medium (also called gain medium or lasing medium) is the source of optical gain within a laser. The gain results from the stimulated emission of electronic or molecular transitions to a lower energy state from a higher energy state previously populated by a pump source.
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