Mainz 2017 – scientific programme

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A: Fachverband Atomphysik

A 16: XUV/X-ray spectroscopy III

A 16.1: Invited Talk

Tuesday, March 7, 2017, 14:30–15:00, N 2

High-power XUV frequency combs — •Christoph M. Heyl^1,2, Gil Porat¹, Stephen Schoun¹, Craig Benko¹, Nadine Dörre^1,3, Kristan L. Corwin^1,4, and Jun Ye¹ — ¹JILA, NIST and the University of Colorado, 440 UCB, Boulder, CO 80309-0440, USA — ²Department of Physics, Lund University, P. O. Box 118, SE-221 00 Lund, Sweden — ³University of Vienna, Faculty of Physics, VCQ & QuNaBioS, Boltzmanngasse 5, A-1090 Vienna, Austria — ⁴Department of Physics, Kansas State University, Manhattan, Kansas, USA

Frequency combs are nowadays routinely used for precision spectroscopy in the visible and near-IR spectral region. In contrast, the extreme ultraviolet (XUV) spectral region presents a barely explored area for precision spectroscopy studies with promising targets such as ground state transitions in helium, highly charged ions and possibly even nuclei. While XUV combs can reach sub-Hz coherence levels [1], the bottleneck is the limited power available in the XUV.

Here we discuss recent steps towards high-power XUV comb generation. These include down-scaling of efficient high-order harmonic conversion schemes [2] to adapt for intra-cavity operation as well as the exploration of intra-cavity plasma dynamics and their suppression. Our recent effort allowed us to generate high harmonics with average power levels in the mW range, setting a new record for XUV combs and more generally, for high-harmonic-based XUV sources.

[1] C. Benko, et al., Nature Photonics 8, 530 (2014).

[2] C. M. Heyl, et al., Optica 3, 75 (2016).