The welding of transparent materials is carried out via a femtosecond near-infrared laser focused by a high numerical aperture lens and coupled to precision micrometer stages.
Thanks to the transparency of the sample at the wavelength of the laser beam, only the interface between the two pieces is impacted. The welding is permanent unlike glue welding, because it is done without an additional material therefore removing the risks of aging, degassing and so on. The process is carried at high speed (up to 100 mm /s).
The process can be used on different materials:
And it finds application in several fields: