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Journal of Micro/Nanolithography, MEMS, and MOEMS

Patterning of optical coatings by laser ablation for the fabrication of dielectric masks and diffractive phase elements
Author(s): Jürgen Ihlemann; Dirk Schäfer
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Paper Abstract

Excimer laser ablation is a versatile method to generate 2- or 3-D microstructured devices for mechanics, fluidics, and optics. Particularly, if in 1-D the structure is predefined by a layer design, and the other two dimensions are defined in the layer ablation process by mask projection, very precise structure definition in three dimensions and ablated surfaces with optical quality can be achieved. By patterning optical layers or layer stacks, a variety of applications is possible. Two examples are demonstrated. 1. Dielectric masks (amplitude masks) are fabricated by structuring a highly reflective dielectric layer stack. These masks can be used in high power laser machining systems. 2. Diffractive optical elements (phase elements) are generated by structured ablation of a transparent layer. The performance of these elements in shaping excimer laser beams is demonstrated.

Paper Details

Date Published: 1 July 2004
PDF: 4 pages
J. Micro/Nanolith. 3(3) doi: 10.1117/1.1759328
Published in: Journal of Micro/Nanolithography, MEMS, and MOEMS Volume 3, Issue 3
Show Author Affiliations
Jürgen Ihlemann, Laser-Lab. Göttingen e.V. (Germany)
Dirk Schäfer, Philips Research Labs. (Germany)

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