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Session Chair: Jessica DeGroote Nelson, Optimax Systems, Inc., United States of America
Location:Room 21 (ICM, 2nd Floor)
16:00 - 16:15 ID: 138 / S04: 1 Manufacturing, Tolerancing, and Testing of Optical Systems (MOS)
Economical Rapid-Prototyping of Aspherical Lenses
Angelina Müller, Matthias C. Wapler, Ulrike Wallrabe
University Freiburg, IMTEK-Department of Microsystems Engineering, Laboratory for Microactuators,Freiburg, Germany
We present a rapid-prototyping process to fabricate aspherical lens arrays based on surface deformation due to thermal expansion of PDMS. Using laser-structuring and molding in combination with an FEM-based shape optimization, we were able to design, fabricate and characterize different micro-lens arrays. This fabrication process can be used for almost any kind of arbitrary lens shape, which allows for a large design freedom for micro lenses.
16:15 - 16:30 ID: 146 / S04: 2 Manufacturing, Tolerancing, and Testing of Optical Systems (MOS)
Reactive Ion Beam Etching – Based Finishing Of Optical Aluminium Surfaces
Melanie Ulitschka1, Jens Bauer1, Frank Frost1, Thomas Arnold1,2
1Leibniz Institute of Surface Engineering (IOM), Germany; 2Technische Universität Dresden, Institute of Manufacturing Science and Engineering, Germany
Reactively driven low-energy ion beam machining is a widely used finishing technique for optical aluminium surfaces. Direct RIBE machining with oxygen or nitrogen process gas permits figure error correction of diversely shaped aluminium optics while preserving the initial roughness up to 1 µm etching depth. Those optical surfaces are appropriate for applications in the infrared spectral range. For increasing demands on optical surfaces for short - wavelength applications in the visible and ultraviolet spectral range ion beam polishing techniques with the aid of a sacrificial layer are a promising process route. Turning marks situated in the high-to –mid spatial frequency range are remarkably reduced while preserving the initial microroughness resulting in an enhancement of the full range roughness.
16:30 - 16:45 ID: 149 / S04: 3 Manufacturing, Tolerancing, and Testing of Optical Systems (MOS)
Splicing Fluoride Glass and Silica Optical Fibers
Solenn Cozic1, Simon Boivinet2, Christophe Pierre2, Johan Boulet2, Samuel Poulain1, Marcel Joseph Poulain1,3
Splicing fluoride glass fibers and silica fibers is a critical point for manufacturing all fibered laser modules. As these materials are extremely different, various problems must be considered: thermal, expansion, mechanical, chemical. Reliability and power handling make priority concerns. We report splices made on a 200/220 multimode silica fiber and a double clad 15/250/290 ZBLAN fiber. Splices are proof tested at 300 g tensile strength. No damage is observed after thermal cycling from -30 °C to 85 °C, at 40 % RH during 24 hours. Typical optical splice loss is about 0.2 dB. They withstand 220 W input power at 976 nm without any damage and drastic temperature increasing.
16:45 - 17:00 ID: 106 / S04: 4 Manufacturing, Tolerancing, and Testing of Optical Systems (MOS)
Testing the Transmitted Wavefront of Large Aperture Long-focallength Lens Using a Multizone Computer-generated Hologram
Jian-Peng Cui, Ning Zhang, Jie Liu, Di-Long Wu, Hua Xu, Ding-Yao Yan, Ping Ma
Chengdu Fine Optical Engineering Research Center, China, People's Republic of
A method for testing the transmitted wavefront of large aperture long-focal-length lens with a
multizone computer-generated hologram (CGH) is proposed. The multizone CGH has 5 zones: one main zone
for the null testing of long-focal-length lens and four auxiliary zones for the pre-alignment of measured lens.
Both 1st order wavefront and 0th order wavefront of CGH are measured, and 0th order wavefront is used to
calibrate the substrate error. To verify this test approach, a 450mm×450mm multizone CGH is designed and
fabricated for testing the spatial filter lens. Experiments and error analysis are carried out. The results show
that the desired precision can be reached with use of CGH.