Laser ablation enables the manufacturing of refractive or diffractive lenses of glass or plastics. In contrast to many other production technologies, the fabrication is possible even under complex geometrical constraints. For instance, micro lenses can be made directly on the tip of an optical fiber.
An important component in micro-optical modules are Fresnel lenses. Due to their flat design, they allow a low construction height in the range of a few micrometers and easy integration with planar surfaces for high integration density. An application example is the provision of optical interconnects for data communication systems. To enable fast data transfer, the electrical signals are converted by optoelectronic transceiver modules into optical signals and then fed into optical waveguides. For the efficient coupling between light sources, waveguides and detectors, micro lenses are required. The lenses need to be integrated into the electro-optical circuit boards or in so-called glass interposers.
L. Brusberg, M. Neitz, H. Schröder, T. Fricke-Begemann, J. Ihlemann:
Fabrication of Fresnel micro lens array in borosilicate glass by F2 laser ablation for glass interposer application,
Proc. SPIE 8951, 89510H (2014)
T. Fricke-Begemann, J. Ihlemann
Hybrid micro-optical elements by laser-based fabrication of Fresnel lenses on the end face of gradient index lenses,
Optics Express 26, 23751 (2018)
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Laser-Laboratorium Göttingen e.V. (LLG)
Head of the Department
Dr. Peter Simon
"Short Pulses / Nanostructures"
Contact person for
Nano Structure Technology:
Dr. Jürgen Ihlemann