Ultrafast Spectroscopy and Attosecond Science

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Time-Resolved Photoelectron Spectroscopy

Time-resolved XUV photoelectron spectroscopy with isolated harmonics

We have developed a time-preserving extreme-ultraviolet (XUV) monochromator using the principle of conical diffraction and a semi-infinite gas cell as a target for high-harmonic generation. The performance of this beamline in the photon-energy range of 20 eV to 42 eV has been characterized. We have measured the order-dependent XUV pulse durations as well as the flux and the spectral contrast. XUV pulse durations of ~40 fs using 32 fs 800 nm driving pulses were measured. The spectral contrast was better than 100 for the entire energy range.

Enlarged view: vonconta16afig3
Figure 1: Optical layout of the monochromator. The XUV beam is collimated by the toroidal mirror TOR1. It propagates onward to the grating G after which it is refocused onto the selection plane by TOR2. The focus in the selection plane is imaged by the mirror TOR3 into the experiment. The selection slit S can be replaced by a multi-channel plate detector (MCP). Via M5 the phosphor screen of the MCP can be imaged with a camera (CAM).

Publications:
[1]    A. von Conta, M. Huppert, H. J. Wörner
"A table-top monochromator for tunable femtosecond XUV pulses generate in a semi-infinite gas cell: Experiment and simulations" (PDF, 1.2 MB)
Rev. Sci. Instrum. 87, 073102 (2016)
doi: external page 10.1063/1.4955263external page