Characterization of Fs-laser induced unintended, periodic structures in hydroxy-ethyl-methacrylat (HEMA)

Emanuel Saerchen; Susann Liedtke; Fabian Schlage; Fabian Will; Holger Lubatschowski

doi:10.1117/12.2032495

24 June 2013 Characterization of Fs-laser induced unintended, periodic structures in hydroxy-ethyl-methacrylat (HEMA)

Emanuel Saerchen, Susann Liedtke, Fabian Schlage, Fabian Will, Holger Lubatschowski

Proceedings Volume 8803, Medical Laser Applications and Laser-Tissue Interactions VI; 880305 (2013) https://doi.org/10.1117/12.2032495
Event: European Conferences on Biomedical Optics, 2013, Munich, Germany

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.

Citation Download Citation

Emanuel Saerchen, Susann Liedtke, Fabian Schlage, Fabian Will, and Holger Lubatschowski "Characterization of Fs-laser induced unintended, periodic structures in hydroxy-ethyl-methacrylat (HEMA)", Proc. SPIE 8803, Medical Laser Applications and Laser-Tissue Interactions VI, 880305 (24 June 2013); https://doi.org/10.1117/12.2032495

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