A very simple and cheap method is shown for making a gaussian laser beam have a flat-top energy distribution in the far-field.

© 1997 Optical Society of America

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Figures (2)

Figure 1
Figure 1

Defocused truncated gaussian beam, in far-field. 35% of energy within ±5% intensity uniformity.

Figure 2
Figure 2

Defocused gaussian beam with less truncation. 20% of energy within ±1% intensity uniformity.