Two-photon absorption is enabling additive manufacturing at incredibly fine scales—with emerging techniques promising to enhance speed, precision and flexibility.
IMAGE OF THE WEEK
Fresnel diffraction patterns
The picture shows Fresnel diffraction patterns of a radial spoke mask with 4 degree period. The three patterns are photographed at different distances from the mask. They have a natural explanation in terms of the Talbot re-imaging phenomenon, and might be called “Talbot Rugs.”
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