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Proceedings Paper

Characterization of Fs-laser induced unintended, periodic structures in hydroxy-ethyl-methacrylat (HEMA)
Author(s): Emanuel Saerchen; Susann Liedtke; Fabian Schlage; Fabian Will; Holger Lubatschowski
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Paper Abstract

In ophthalmic surgery fs laser pulses are used as a precise and safe cutting tool. At specific processing parameters, however, an interesting phenomenon of unintended periodic structures inside the tissue can be observed. In this study, a transparent polymer served as ocular phantom material for further investigations. A Femtosecond laser with MHz-repetition rate and pulse energies below 200 nJ was used. The size of the durable material change caused by applied fs-single pulses was measured in regard to the pulse energy. Furthermore, lines were cut inside the material with different laser spot distances and laser pulse energies. The creation and enhancement of unintended step-like structures could be related to a decrease of spot distance and further increase of pulse energy. Cutting planes inside the material resulted also in a formation of step like structures. For planes the step-like structures were formed with different orientation in the x-y-plane in regard to the used line distance between two applied lines. A maximum step height of 75 μm was measured using our setup. Those periodic structures are unwanted for any application in the field of laser material processing, ophthalmology or biomedical sectioning. Hence, investigations of the parameters which trigger this phenomenon are of great interest.

Paper Details

Date Published: 24 June 2013
PDF: 5 pages
Proc. SPIE 8803, Medical Laser Applications and Laser-Tissue Interactions VI, 880305 (24 June 2013); doi: 10.1117/12.2032495
Show Author Affiliations
Emanuel Saerchen, Rowiak GmbH (Germany)
Susann Liedtke, Rowiak GmbH (Germany)
Fabian Schlage, Rowiak GmbH (Germany)
Fabian Will, Rowiak GmbH (Germany)
Holger Lubatschowski, Rowiak GmbH (Germany)


Published in SPIE Proceedings Vol. 8803:
Medical Laser Applications and Laser-Tissue Interactions VI
Lothar D. Lilge; Ronald Sroka, Editor(s)

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