https://research.birmingham.ac.uk/portal/files/38372229/Accepted_manuscript.pdf

Laser polishing of 3D printed mesoscale components

Mechanical polishing of glass is a time consuming process especially for lenses deviating from spherical surface such as aspheres. With laser polishing, the processing time can be significantly reduced and the wear of hard tooling can be avoided. Using laser radiation for polishing, a thin surface layer of the glass is heated up just below evaporation temperature due to the interaction of glass material and laser radiation. With increasing temperature, the reduced viscosity in the surface layer leads to the reduction of the roughness due to the surface tension. Hence, a contactless polishing method can be realized nearly without any loss of material or need of polishing agent. In this paper, results for laser polishing of fused silica, BK7, and S-TIH6 are presented with area rates up to 5 cm2/s. However, the results show that the achieved roughness with laser polishing is strongly influenced by the thermal properties of the type of glass. During laser polishing, the glass material is relocated at the surf...

Laser polishing and laser shape correction of optical glass

With the advance of contemporary technology, high precision surface finishing techniques for optical glasses are of great concern and developing to meet the requirements of the effective industrialized processes Not only the used tools but also process parameters have great influence on the surface roughness improvements In this paper, surface roughness improvement of Zerodur optical glass using an innovative rotary abrasive fluid multi-jet polishing process has been presented For the same purpose, a tool for executing ultra precision polishing was designed and manufactured Taguchi's experimental approach, an L 18 orthogonal array was employed to obtain the optimal process parameters ANOVA analysis has also been carried out to determine the significant factors It was observed that about a 9833% improvement on surface roughness from ( R a ) 0360 μm to ( R a ) 0006 μm has been achieved The experimental results show that a surface finished achieved can satisfy the requirements for optical-quality surface ( R a

Parameters optimization on surface roughness improvement of Zerodur optical glass using an innovative rotary abrasive fluid multi-jet polishing process

A force controlled grinding-milling technique for quartz-glass micromachining

We report on the fabrication of an axicon by applying a two-step manufacturing process including a 1030 nm femtosecond and a 10.6 µm CO2 laser. First, the pre-defined axicon geometry is generated by high-precision femtosecond layer-by-layer ablation. In order to meet high surface quality requirements, inevitable stipulated for optical use, the surface of the thus structured axicon is smoothened by a subsequent CO2 laser polishing process. The finalized axicon fulfills optical quality as the surface roughness Ra is significantly reduced from 0.56 µm to 34 nm. For the evaluation of the optical quality, the axicon is placed in a measurement setup including the femtosecond laser. Comparison between the calculated Bessel beam for an ideal axicon and the quasi-Bessel beam generated and measured by the fabricated axicon reveals excellent agreement, verifying our precise manufacturing method.

Fabrication of a high-quality axicon by femtosecond laser ablation and CO2 laser polishing for quasi-Bessel beam generation.

https://e-pub.uni-weimar.de/opus4/files/3136/1-s2.0-S1875389211001350-main_pdfa.pdf

Laser Beam Polishing of Quartz Glass Surfaces

Advanced Analysis of Laser Beam Polishing of Quartz Glass Surfaces

The aim of laser beam polishing (LBP) is to achieve an even surface finish in shortest possible time without changing the contour. Laser radiation acts as a topology-independent non-wearing, massless tool for powerless manufacturing, where parameters can be changed rapidly. Combined with a laser scanning system flexibility and speed can be improved with a high accessibility toward the surface. The locally limited heat-affected zone can be disadvantageous for glass-manufacturing in that it leads to thermal strain and destruction in extreme cases. The traditional mechanical finishing of fused silica contains some restrictions like a high grade of pre-machining and the dimensions of the polishing tools, which confine the minimum size of the structures to be polished.

Carbon‐Dioxide Laser Beam Polishing of Fused Silica Surfaces – Process Development and Optimization

Production of molding inserts (1) from glass, ceramic or glass-ceramic comprises: (A) producing a preform; (B) forming the molding surface (2) on it by addition or removal of material; and (C) finishing it using a laser beam.

Production of molding inserts from glass, ceramic or glass-ceramic comprises producing preform, forming molding surface on it by addition or removal of material; and finishing it using laser beam

Kerstin Hecht

Papers

Laser Beam Polishing of Quartz Glass Surfaces

Advanced Analysis of Laser Beam Polishing of Quartz Glass Surfaces

Carbon‐Dioxide Laser Beam Polishing of Fused Silica Surfaces – Process Development and Optimization

Production of molding inserts from glass, ceramic or glass-ceramic comprises producing preform, forming molding surface on it by addition or removal of material; and finishing it using laser beam