XUV / IR – Pulse Delay Unit

Our pulse delay unit makes use of our XUV multilayer mirrors and combines them with our profound knowledge in pump-probe experimental setups. The two-segment mirror can focus two XUV/IR pulses onto a common point with a precisely adjustable interferometric time delay.

Our pulse delay unit makes use of our XUV/soft X-ray multilayer double mirrors and combines them with our profound knowledge in pump-probe experimental setups. The two-segment mirror facilitates focusing IR pulses and lower divergent XUV/soft X-ray pulses onto a common focus with an interferometrically precisely adjustable time delay. This allows temporal resolved experiments with pumping systems of interest either with the XUV/soft X-ray pulse and probe it with the IR or vice-versa. Based on the nature of e.g. attosecond pulses generated in the XUV/soft X-ray range by high-harmonic generation (HHG) this offers state-of-the-art highest temporal resolution for your experiments. The mirror coating can be customized according to the center energy and bandwidth.

Key Product Features:

  • Temporal resolution: 3 attoseconds
  • Scan range: 300 femtoseconds
  • Adjustment with 5 degrees of freedom
  • Customized energy range and bandwidth
  • Vacuum combability: <10-6 mbar
  • Travel range actuator: 100 μm (software limits the range from 0-95 μm)
  • Resolution actuator: 2 nm
  • Travel range: 25 mm
  • Step size: < 30 nm

Working Principle:

Our pulse delay unit makes use of the different divergence of both beams. The outer mirror ring shapes and focuses the high divergent IR pulses whereas the core is responsible for shaping and focusing the low divergent XUV/soft X-ray pulses [1]. The lower divergence of the XUV/soft X-ray pulses is attributed to the higher photon energy. Our system offers adjustment of 5 degrees of freedom to ensure a perfect spatial and temporal overlap of both pulses in the focus.


Working principle of the delay unit. The time delay is introduced by changing the core position (reflecting the XUV/soft X-ray pulses) in respect to the ring (reflecting the IR pulses). Adjustment of 5 degrees of freedom offers perfect control for spatial and temporal overlap in the focus.

Application – Attosecond Streaking:


Attosecond photoelectron streaking experiments performed with our XUV/IR pulse delay unit at MPQ (Garching, Germany) are shown above. The top figure depicts the measurement performed with a short 80 attosecond pulse and a 3.3 femtosecond streaking IR pulse (its vector potential is shown in dashed white) [2]. The bottom results from a 250 attosecond pulse and a 4.3 femtosecond IR pulse. Both demonstrate the high achievable temporal resolution with our device, the key to innovation and success in ultrafast experiments.


  1. R. Kienberger, E. Goulielmakis, M. Uiberacker, A. Baltuska, V. Yakovlev, F. Bammer, A. Scrinzi, Th. Westerwalbesloh, U. Kleineberg, U. Heinzmann, M. Drescher, and F. Krausz, “ Atomic transient recorder,” Nature 427, 817-821 (2004).
  2. E. Goulielmakis, M. Schultze, M. Hofstetter, V. S. Yakovlev, J. Gagnon, M. Uiberacker, A. L. Aquila, E. M. Gullikson, D. T. Attwood, R. Kienberger, F. Krausz, U. Kleineberg, “SingleCycle Nonlinear Optics,” Science 320(5883), 1614-1617 (2008).