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Proceedings Paper

Ultrafast Yb:YAG thin-disk oscillator with pulse energies exceeding 25 uJ suitable for efficient ablation with negligible heat affects
Author(s): Joerg Neuhaus; Dominik Bauer; Christoph Scharfenberg; Dirk H. Sutter; Jochen Kleinbauer; Sascha Weiler; Alexander Killi; Thomas Dekorsy
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Paper Abstract

We have studied experimentally and numerically the pulse shaping dynamics of a diode-pumped thin-disk laser oscillator with active multipass cell and large output coupling rates. We demonstrate the generation of high energy subpicosecond pulses with energies of up to 25.9 μJ and durations of 928 fs directly from a thin-disk laser oscillator without further amplification. We have achieved these results by employing a selfimaging active multipass geometry in order to increase the output coupling rate for a suppression of nonlinear optical effects. With this system we have obtained stable single pulse operation in ambient atmosphere with average output powers above 76W at a repetition rate of 2.93 MHz. A semiconductor saturable absorber mirror was used to start and stabilize passive soliton mode locking. The experimentally studied laser pulses show good agreement with numerical simulations including the appearance of Kelly sidebands. We also present a modification to the soliton area theorem that is applicable for such a laser oscillator with active multiple pass cell and large output coupling rate. Furthermore, we demonstrate the laser's potential for micro machining applications by showing first examples of material processing, such as the determination of ablation thresholds and ablation rates for various materials.

Paper Details

Date Published: 24 February 2009
PDF: 12 pages
Proc. SPIE 7203, Commercial and Biomedical Applications of Ultrafast Lasers IX, 72030T (24 February 2009); doi: 10.1117/12.807538
Show Author Affiliations
Joerg Neuhaus, TRUMPF Laser GmbH & Co. KG (Germany)
Univ. of Konstanz (Germany)
Dominik Bauer, TRUMPF Laser GmbH & Co. KG (Germany)
Univ. of Konstanz (Germany)
Christoph Scharfenberg, TRUMPF Laser GmbH & Co. KG (Germany)
Dirk H. Sutter, TRUMPF Laser GmbH & Co. KG (Germany)
Jochen Kleinbauer, TRUMPF Laser GmbH & Co. KG (Germany)
Sascha Weiler, TRUMPF Laser GmbH & Co. KG (Germany)
Alexander Killi, TRUMPF Laser GmbH & Co. KG (Germany)
Thomas Dekorsy, Univ. of Konstanz (Germany)

Published in SPIE Proceedings Vol. 7203:
Commercial and Biomedical Applications of Ultrafast Lasers IX
Joseph Neev; Stefan Nolte; Alexander Heisterkamp; Rick P. Trebino, Editor(s)

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