Test methods to modern high-performance optics
The LZH adapts together with partners procedures of destruction threshold measurements to be able to test also smaller optics reliably.
Photo: LZH
The development of new laser systems and optics requires established testing methods for optics to be reviewed and adapted.
In the cw-LIDT research project, the Laser Zentrum Hannover e.V. (LZH) is working together with LASEROPTIK GmbH and RAYLASE GmbH to be able to reliably examine high-power laser optics.
A limiting factor in developing new laser systems is the optical resilience of the components with which the laser radiation is generated and guided. These are necessary to achieve ever higher optical outputs. At the same time, there is a growing demand for low-weight optical components, for example, for use in galvanometer scanners in material processing.
Ensure performance compatibility of innovative optics
The scientists at the LZH are therefore developing measurement routines in the project to test and consequently guarantee the performance compatibility of such optics. In this context, the previous findings of the established optics tests cannot be transferred without further ado to modern optics with reduced geometry and therefore lower weight. For example, according to ISO standard 21254, the optics is irradiated at 100 positions. This is not possible with smaller surface areas, since the measuring points influence each other, for example through thermal conduction or thermal stresses.
With the new measurement routine, the Photonic Materials group of the LZH investigates different optics and uses the results to create models to make optics even more robust in the future. In doing so, they take into account different materials, geometries, and different manufacturing processes. LASEROPTIK develops optics coatings of the highest destructive strength adapted to special geometries. These components are then inserted into a deflection unit manufactured by RAYLASE and tested by the LZH close to the application, i.e. in the finished module and with parameters similar to the later application. The aim is to develop more stable scanner modules.
About cw-LIDT
In the project “Standardized test method for high-performance optics in continuous wave operation (cw-LIDT)”, the LZH is working together with LASEROPTIK GmbH, Garbsen, and RAYLASE GmbH, Wessling. The project is funded by the German Federal Ministry for Economic Affairs and Climate Action.
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