1 February 1992 Transforming a circular laser beam into a square or trapezoid--almost
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Optical Engineering, 31(2), (1992). doi:10.1117/12.56060
Abstract
An aberrated laser beam will change shape as it propagates. We use this phenomenon to transform a collimated, uniform-intensity, round beam into a square beam with rounded corners and a fairly uniform intensity. The square beam can be recollimated because no rays cross each other. We found a similar transformation that turns a circular beam into a trapezoidal shape with rounded corners. These aberrating elements can be fabricated using binary optics technology.
William C. Sweatt, "Transforming a circular laser beam into a square or trapezoid--almost," Optical Engineering 31(2), (1 February 1992). https://doi.org/10.1117/12.56060
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