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Why Use a Flat Top Laser Beam?

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Why Use a Flat Top Laser Beam?

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Most laser beams are Gaussian, though in certain cases it can be beneficial to have a non-Gaussian irradiance profile. Gaussian beams have a decrease in their symmetric irradiance profiles as the distance from the center of the laser beam cross-section increases. Flat top, or top hat, beams have a constant irradiance profile through the cross-section of the laser beam (Figure 1). Some applications benefit from a constant intensity over a given area, including the processing of semiconductor wafers, nonlinear frequency conversion at high power levels, and materials processing.

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