1. Intensity profiles (a) of a Gaussian beam, (b) top-hat beam, (c)

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a) Arrangement for converting a Gaussian beam into a top-hat

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Generation of a terahertz collimated top-hat beam by using two thin diffractive phase plates

Gaussian beam - Wikipedia

Application Note: Beam Shaper

Gaussian Beam Optics

1. Intensity profiles (a) of a Gaussian beam, (b) top-hat beam, (c