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Absorbing filter to flatten Gaussian beams

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Abstract

An absorbing filter that flattens the Gaussian intensity profile of a laser beam has been developed. The filter was fabricated by dc magnetron sputtering a thin tantalum film, by using a combination of substrate masking and motion. A model of the filter production has been developed that successfully predicts the film profile and performance. A typical filter produced by using these techniques results in a flat output to within ±3% over a 2.2 mm with a transmission of 60% of the peak intensity of the Gaussian beam.

© 1992 Optical Society of America

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