Within a laser, the active laser medium or gain medium is the material that exhibits optical gain. This gain is generally generated by stimulated emission on electronic or molecular transitions to a lower energy state, starting from a higher energy state to which it had been previously stimulated by means of a pump source.
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An active medium, device, or system in which amplification of input occurs with or without feedback. Note: Gain media include amplifiers, lasers, and avalanche photodiodes (APDs).
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