Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).
This presentation describes a telescope design in which all optical surfaces of an off-axis telescope are manufactured from a single optical blank. An initial demonstration of this monolithic telescope consisting of two reflective and two refractive surfaces is presented along with proposed next generation designs.
16:45 - 17:00
Optimizing ductile mode grinding in terms of generated level of surface roughness: Rq = f(hcut)
Optimizing parameters of surface physics by adjusting coolant characteristics, it has been demonstrated that the critical depth of cut on ultra precision grinding and turning machines below which ductile mode grinding takes place can be significantly increased from dozens of nm up to more than 1000 nm; this in contrast to predictions based on Bifano's formula. That way, analyses within the ductile mode removal regime varying depths of cut are enabled. It was found that the surface roughness level generated is proportional to the applied depth of cut, enabling a ductile mode finishing run generating ultra smooth ductile ground surfaces featuring surface roughness values of less than 6 nm rms.
17:00 - 17:15
Imprinting of optical and MEMS wafer level microstructures by using precision glass molding
Alois Kasberger2, Christian Wistl2, Förg Raimund1
1Technische Hochschule Deggendorf, Germany; 2Technology Application Centre Spiegelau
Due to growing demand for ever smaller becoming components and structures, new concepts for an efficient production of these micro parts must be considered. Precision glass molding is an eligible process for high volume production of optical and micro components made out of glass. Those reduced structure sizes results in new processes for molding and tooling of molds. Beyond structure, sizes of 500µm common machining processes like milling fasten reach their limit. Alternative processes like etching methods need to be applied for the moldmaking. Also the strategies in the molding process need to be modified to those orders of magnitude. The present report deals with the development of micro glass molding processes for structures down to tens of micrometer range.
17:15 - 17:30
Fabrication of lens array with DLP based 3D printing and thermal finishing
K. N. Toosi University of Technology, Iran, Islamic Republic of
A lens array structure is first 3D printed. To improve the surface quality, the printed parts, are silicon molded. Silicon mold is then filled with molding wax with low melting point. Wax parts are heated and thermal finishing is achieved. The finished wax parts are silicon molded again and exact replica of them are produced by a transparent epoxy resin.
17:30 - 17:45
Liquid phase imprinting on Gallium/PDMS boundary for on-demand lens fabrication
On-demand and print-like fabrication of optical components was proposed. Liquid Ga injection and its “push-pull” process provided positive and negative meniscus. Solid Ga mold for concave, and liquid Ga mold for convex were successfully fabricated, and the fabricated PDMS lens were evaluated.
17:45 - 18:00
Direct Laser Fabrication of Micro Fresnel Lenses
Michael Pfeifer1, Sebastian Büttner1, Ruiyong Zhang2, Murat Serbay2, Steffen Weißmantel1
1Laserinstitut Hochschule Mittweida, Germany; 2FCI Deutschland GmbH, Germany
Fluorine laser microstructuring enables the direct laser fabrication of micro Fresnel lenses. Therefore the mask projection technique has been further developed for the use of rotating masks. This technique enables the manufacturing of lenses with nearly optimum spherical curved surfaces and a good surface quality.