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The Photonics Spotlight

Lasers with Nonlinear Input-Output Characteristics

Ref.: encyclopedia articles on slope efficiency, thermal lensing, four-level and three-level gain media

The slope efficiency of a laser is an often used quantity, but there are actually plenty of cases where such a specification makes no sense – simply because there is no linear relation between pump power and output power!

The possible reasons for such behavior are manifold:

It may not always be easy to find out what the actual cause of the observed effect is. However, as long as this hasn't been accomplished, one cannot be sure e.g. what is the reason of a non-satisfactory power efficiency.

This article is a posting of the Photonics Spotlight, authored by Dr. Rüdiger Paschotta. You may link to this page, because its location is permanent. See also the Encyclopedia of Laser Physics and Technology.

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