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What is Convolution, or How Small of a Beam Can I Measure?

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What is Convolution, or How Small of a Beam Can I Measure?

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One of the differences between a CCD and slit scanning beam profiler is the lower limit of beam size measurement. A CCD is limited to around 10 pixels for an accurate beam measurement. With the current CCD technology, this means that a CCD can measure a beam of approximately 40-50 um diameter. A scanning slit profiler is known for being able to measure smaller beams.The beam width is measured between the points where the intensity falls to a fraction, p, of the peak intensity at the center. The most commonly used values are p=0.5 for the full width at half-maximum (FWHM ), and p=0.1353 at the 1/e² diameter.

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