Affiliation:
1. Universität Stuttgart
2. Paul Scherrer Institute
3. Sorbonne Université
4. Johannes Gutenberg-Universität Mainz
Abstract
We report on an Yb:YAG thin-disk multipass amplifier delivering 100 ns long pulses at a central wavelength of 1030 nm with an energy of 330 mJ at a repetition rate of 100 Hz. The beam quality factor at the maximum energy was measured to be M2 < 1.17. The small signal gain is 21.7, and the gain at 330 mJ was measured to be 6.9. The 20-pass amplifier is designed as a concatenation of stable resonator segments in which the beam is alternately Fourier transformed and relay-imaged back to the disk by a 4f-imaging optical scheme stage. The Fourier transform propagation makes the output beam robust against spherical phase front distortions, while the 4f-stage is used to compensate the thermal lens of the thin-disk and to reduce the footprint of the amplifier.
Funder
Partenariat Hubert Curien
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
Agence Nationale de la Recherche
Deutsche Forschungsgemeinschaft
European Research Council
Subject
Atomic and Molecular Physics, and Optics