Direct Writing Target Structures by Two-Photon Polymerization

Two-photon polymerization (2PP) offers an attractive option for direct writing micron- to millimeter-sized laser target components that support high-energy-density plasma physics research. 2PP was used to deterministically print a number of common targetlike structures including tubes, spatially per...

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Bibliographic Details
Published in:Fusion science and technology 2016-09, Vol.70 (2), p.295-309
Main Authors: Jiang, L. J., Campbell, J. H., Lu, Y. F., Bernat, T., Petta, N.
Format: Article
Language:English
Subjects:
Chemical composition
Laser targets
Plasma physics
Plastic foam
Polymerization
Prints
Tubes
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Summary:Two-photon polymerization (2PP) offers an attractive option for direct writing micron- to millimeter-sized laser target components that support high-energy-density plasma physics research. 2PP was used to deterministically print a number of common targetlike structures including tubes, spatially periodic Rayleigh-Taylor-like surfaces, and low-density foams. The structures were printed using commercially available acrylic photoresins. The elemental compositions are reported for comparison with other polymers used for making target components. A number of foamlike structures ranging in size from tens to hundreds of microns and varying in density from 600 to 60 mg/cm 3 were readily printed in times ranging from several seconds to a few hours depending on the size. In addition, direct printing was demonstrated to fabricate graded-density foam comprising 12 individual layers with a vertical density gradient of 600 to 80 mg/cm 3 . Control of shrinkage and deformation during development and subsequent drying remains a challenge for certain structures and a focus of ongoing research.
ISSN:1536-1055
1943-7641
DOI:10.13182/FST15-222