Friedrich-Alexander-Universität Erlangen-Nürnberg

Laser System for efficient use of Ultrashort Pulse Lasers

Laser System for efficient use of Ultrashort Pulse Lasers

The material processing based on ultrashort pulse laser is becoming increasingly important. New areas of applications can be established due to low thermal stress during processing and very precise and clean ablation results. Currently these lasers are installed into already existing machine concepts for nanosecond laser whereby the high potential of this technology can not be used completely due to inefficient irradiation strategies. In cooperation with LLT Applikation GmbH the Bayerisches Laserzentrum GmbH (blz) is developing an optimized optical system design which efficiently uses the total advantages of this technology.

While a prototype is constructed and build on by LLT, the blz is engaged with researching essential functions which are later realized in the system. The main components include a fine cutting optics as module that can be exchanged with a scanner. Furthermore different beam shaping components will be examined and the influence of irradiation profile on the ablation quality and process efficiency will be investigated.

Another module that is being developed by blz is a novel trepanning optic with the possibility to generate arbitrary beam patterns and tilt angles of the beam. The maximum laser beam offset to optical axis is +/- 0.5 mm. Drillings with round, rectangle or arbitrary shapes are possible in this area. This optic combined with focus shifting allows laser drilling with large aspect ratio. Tilting the laser beam up to 5° can be used for drilling holes with positive or negative conic shape. It’s also possible to do both in the same hole. For example the drilling starts with a circle and ends on the other side with an ellipse or a shifted circle

Possible beam paths of a novel trepanning optic
Schematic diagram of picosecond laser system beam path


SAOT provides an interdisciplinary research and education program of excellence within a broad international network of distinguished experts to promote innovation and leadership in the areas

Optical Metrology
Optical Material Processing
Optics in Medicine
Optics in Communication and Information Technology
Optical Materials and Systems
and Computational Optics.