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Encyclopedia of Laser Physics and Technology

Brightness Converters

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Ask RP Photonics for advice on any kind of brightness converter, beam quality issues, etc.

Definition: optically pumped devices where the generated optical output has a higher brightness than the optical pump source

The output power of a laser device is of course always lower than the pump power. Nevertheless, the brightness of an optically pumped laser can be far higher than the brightness of its pump source, if the pump source has a poor beam quality (thus a low brightness) while the beam quality of the output beam is much better.

Some examples of lasers serving as brightness converters are:

In many cases, the function as a brightness converter is essential for laser applications. For example, many solid-state lasers are used in material processing because their pump light, having too low brightness, could not be used directly. (Another frequently required function is pulse generation e.g. via Q switching.)

See also: brightness, solid-state lasers, fiber lasers, vertical external-cavity surface-emitting lasers

Categories: lasers, photonic devices


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Since October 2008, the Encyclopedia of Laser Physics and Technology is also available in the form of a two-volume book. Maybe you would enjoy reading it also in that form! The print version has a carefully designed layout and can be considered a must-have for any institute library, laser research group, or laser company.

You may order the print version via Wiley-VCH.

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You can get technical consulting from the author, Dr. Rüdiger Paschotta.

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