Oliver Fähnle

Special Section Guest Editorial: Freeform Optics

This PDF file contains the editorial “Special Section Guest Editorial:Freeform Optics” for OE Vol. 55 Issue 07

gPVA: a system for the classification of grinding tools

The Grinding Process Validation Approach (gPVA) presented in 2017 enables the determination of suitable parameter windows for grinding tools. The abrasion properties of grinding tools are determined experimentally. The collected data can be used to derive optimum parameters for defined grinding tasks so that service life, process stability and productivity can be maximized. In this publication, the gPVA method is used to compare different grinding tools. Differences in stock removal performance with identical specified tools from different manufacturers are investigated. In addition to that, recommended tools for fine grinding of fused silica are examined also.

Closed-loop next generation laser polishing

A novel fabrication parameter controlling method for laser polishing processes called CLasso (Control of LASer Surface Optimization) is presented, monitoring within the footprint the smoothening process as well as the removal of ssd in situ. Therefore, it is possible to determine and control the optimum dwell time a footprint needs to stay at a certain point before moving further enabling a more stable and cost optimized polishing.