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The Photonics Spotlight

Mode-Locked Lasers: Lower Average Powers in Shorter Pulses

Posted on 2008-03-26 as a part of the Photonics Spotlight (available as e-mail newsletter!)

Permanent link: https://www.rp-photonics.com/spotlight_2008_03_26.html

Author: Dr. Rüdiger Paschotta, RP Photonics Consulting GmbH

Abstract: It is often experienced that those mode-locked lasers generating shorter pulses also offer lower average powers and pulse energies. The article explains some common reasons for that correlation.

Dr. Rüdiger Paschotta

Ref.: encyclopedia articles on mode-locked lasers, ultrafast lasers, ultrashort pulses

It is very common that those mode-locked lasers generating the shortest pulses tend to offer lower average output powers and pulse energies. This could be surprising, since there is no direct relation between the average power capability and the pulse duration. However, there are various reasons behind the mentioned correlation. Here are some examples:

These are just some typical issues, which introduce trade-offs between different performance parameters of a laser design. Any laser design involves many different aspects with many more or less obvious relations between those, and any dropped requirement (such as a particularly short pulse duration) may allow the designer to shift certain properties so that better performance in other aspects can be achieved. And of course the opposite holds as well: demanding more on one side can compromise other features – at least when the overall design is optimized, so that no room for general improvement is wasted anywhere.

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

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