Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 63: Ultrakurze Laserpulse: Erzeugung und Anwendungen 2

Q 63.7: Vortrag

Freitag, 18. März 2011, 12:00–12:15, SCH A215

Laser Induced Lensing During In-Volume Modification of Glass With Fs-Laser Radiation — •Anna Schiffer, Martin Hermans, and Jens Gottmann — Lehrstuhl für Lasertechnik, RWTH Aachen, Steinbachstr. 15, 52074 Aachen

The manufacturing of transparent microcomponents and integrated optical systems is an important development for future technologies. Glass-microcomponents and waveguides are processed by focusing ultra short pulsed laser radiation into glass using microscope objectives and translation stages. Fs-Laser radiation is absorbed by multi-photon processes within the focal volume. Optical and chemical properties of the material change, thus showing waveguiding characteristics and a change in etchability. Effects of a fs-fiber laser system (IMRA America, 1045nm) on fused silica and borosilicate glass are investigated. Modification characteristics are changed by variation of repetition rate, pulse energy, focusing numerical aperture and writing speed.

The aforementioned modification process of glass is not fully understood. In order to develop an applicable process for industrial use further investigation is needed. In-situ analysis by interference microscopy and emission spectroscopy offers the possibility of establishing a correlation between the observed experimental data and resulting modification. Interference microscopy provides information on occuring heat accumulation and the laser induced lens during processing. The spectral analysis of emitted radiation provides further information about the electronic absorbtion processes, such as the formation of colour centres, non-bridging oxygen-vacancies and peak temperature.