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Proceedings Paper

Comparison of freeform manufacturing techniques in the production of monolithic lens arrays
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Paper Abstract

Monolithic lens arrays are used in applications such as hyper-spectral imaging, Shack-Hartmann wavefront sensors, and lens replication molds, where lens-to-lens registration is critical. Traditionally, monolithic lens arrays are produced by diamond turning one lens at a time on axis. This process requires the substrate to be shifted to a new position before the next lens is machined. This intermediate step increases production time and makes it difficult to achieve lens-to-lens registration accuracy. Freeform diamond machining allows lens arrays to be produced in a single setup. Since there are no intermediate shifts of the substrate, the lens-to-lens registration is inherent to the program and machine accuracy. The purpose of this paper is to compare different freeform manufacturing processes in the production of a three-element germanium lens array. Freeform machining technologies including Slow Tool Servo (STS), Fast Tool Servo (FTS) and Diamond Micro-Milling (DMM) will be used to produce this lens array. The results for process times, figure, and finish characteristics will be compared across all three techniques.

Paper Details

Date Published: 24 August 2009
PDF: 8 pages
Proc. SPIE 7426, Optical Manufacturing and Testing VIII, 742605 (24 August 2009); doi: 10.1117/12.824451
Show Author Affiliations
Gregg E. Davis, II-VI Infrared (United States)
Jeffrey W. Roblee, AMETEK Precitech, Inc. (United States)
Alan R. Hedges, II-VI Infrared (United States)

Published in SPIE Proceedings Vol. 7426:
Optical Manufacturing and Testing VIII
James H. Burge; Oliver W. Fähnle; Ray Williamson, Editor(s)

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