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The Unintuitive Balancing Act of Beam Expander Properties to Maximize Focused Spot Intensity

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The Unintuitive Balancing Act of Beam Expander Properties to Maximize Focused Spot Intensity

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  • Author: Jay Small
For laser applications working with a focused beam, the goal is often to achieve a focused spot size with a power density high enough for the given process. A beam delivery system will include the initial laser, a collimator stage, and a final focusing element. Often, a beam expander is used to increase the beam into the focuser to reduce the spot size. A common assumption is to require the clear aperture of the beam expander to subtend at least 2X the input beam diameter to avoid spoiling the laser beam quality, reducing laser power, and attaining a minimized spot size.

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