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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.

Note that you can also receive the articles in the form of a newsletter.

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© Dr. Rüdiger Paschotta, RP Photonics Consulting GmbH, also at Google+     All rights reserved worldwide
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A Quiz Question

taken from the Photonics Quiz:

Which of the following statements concerning frequency doubling of ultrashort pulses are correct?

(a) Shorter pump pulses can lead to a higher conversion efficiency.

(b) Shorter pump pulses can lead to a lower conversion efficiency.

(c) Crystal damage is more likely to be a problem for shorter pulses.

(d) For efficient conversion, one needs to check both group velocity mismatch and the phase-matching bandwidth.

(e) The phase-matching bandwidth is irrelevant as long as the pulses are not chirped, so that their instantaneous frequency is constant.

After selecting your answer(s) and pressing this button, find the explanations on the left side.

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