Ultrashort pulse laser beam allows free form 3D structuring of photopolymers at the micro- and nanoscale.
There is a huge variety of materials that can be processed, including hybrid organic-inorganic photopolymers, biodegradable polymers, elastomers, proteins, etc.
Multi-photon polymerization is a direct laser-write technique (3DLL).
Differently from 3D printing, laser light does not draw a continuous line but is applied selectively.
This allows manufacturing of functional devices in micro-optics, microfluidics, micromechanics, tissue engineering, etc.