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Proceedings Paper

Thin-disk laser multi-pass amplifier
Author(s): K. Schuhmann; M. A. Ahmed; A. Antognini; T. Graf; T. W. Hänsch; K. Kirch; F. Kottmann; R. Pohl; D. Taqqu; A. Voss; B. Weichelt
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Paper Abstract

In the context of the Lamb shift measurement in muonic helium [1,2,3,4] we developed a thin-disk laser composed of a Q-switched oscillator and a multi-pass amplifier delivering pulses of 150 mJ at a pulse duration of 100 ns. Its peculiar requirements are stochastic trigger and short delay time (< 500 ns) between trigger and optical output [5]. The concept of the thin-disk laser allows for energy and power scaling with high efficiency. However the single pass gain is small (about 1.2). Hence a multi-pass scheme with precise mode matching for large beam waists (w = 2 mm) is required. Instead of using the standard 4f design, we have developed a multi-pass amplifier with a beam propagation insensitive to thermal lens effects and misalignments. The beam propagation is equivalent to multiple roundtrips in an optically stable resonator. To support the propagation we used an array of 2 x 8 individually adjustable plane mirrors. Astigmatism has been minimized by a compact mirror placement. Precise alignment of the kinematic array was realized using our own mirror mount design. A small signal gain of 5 for 8 passes at a pump power of 400 W was reached. The laser was running for more than 3 months without the need of realignment. Pointing stability studies is also reported here.

Paper Details

Date Published: 20 February 2015
PDF: 11 pages
Proc. SPIE 9342, Solid State Lasers XXIV: Technology and Devices, 93420U (20 February 2015); doi: 10.1117/12.2078858
Show Author Affiliations
K. Schuhmann, ETH Zürich (Switzerland)
Paul Scherrer Institute (Switzerland)
M. A. Ahmed, Max-Planck-Institut für Quantenoptik (Germany)
A. Antognini, ETH Zürich (Switzerland)
T. Graf, Univ. Stuttgart (Germany)
T. W. Hänsch, Max-Planck-Institut für Quantenoptik (Germany)
K. Kirch, ETH Zürich (Switzerland)
Paul Scherrer Institute (Switzerland)
F. Kottmann, ETH Zürich (Switzerland)
R. Pohl, Max-Planck-Institut für Quantenoptik (Germany)
D. Taqqu, ETH Zürich (Switzerland)
Max-Planck-Institut für Quantenoptik (Switzerland)
A. Voss, Univ. Stuttgart (Germany)
B. Weichelt, Univ. Stuttgart (Germany)

Published in SPIE Proceedings Vol. 9342:
Solid State Lasers XXIV: Technology and Devices
W. Andrew Clarkson; Ramesh K. Shori, Editor(s)

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