In the frame of the Femtoweld collaborative project between Amplitude Systèmes, the CELIA laboratory (intense lasers and applications center) and ALPhANOV, a cutting edge cutting method has been developed and a patent application has been filed on this subject.
More specifically, this method can be employed for cutting toughened glass, non-tempered glass or crystalline materials. It uses a particular shaping of the laser beam called Bessel beam.
The Bessel beam is an elongated laser beam which allows to achieve material modification lengths in the material volume of the order of one hundred microns. This relatively long length allows cutting with a reduced number of passes and and high speed (1m/s), leading to a short machining time. The cut is made without ablation, it is straight and accuracies of the order of one micrometer can be reached.
For this process, typically a femtosecond or sub-picosecond laser, with a near-infrared wavelength, is employed.
Examples of use are: