Intense sub-micrometre focusing of soft X-ray free-electron laser beyond 1016 W   cm − 2 with an ellipsoidal mirror

Intense sub-micrometre focusing of a soft X-ray free-electron laser (FEL) was achieved by using an ellipsoidal mirror with a high numerical aperture. A hybrid focusing system in combination with a Kirkpatrick – Baez mirror was applied for compensation of a small spatial acceptance of the ellipsoidal mirror. With this system, the soft X-ray FEL pulses were focused down to 480   nm × 680   nm with an extremely high intensity of 8.8 × 1016   W   cm − 2 at a photon energy of 120   eV, which yielded saturable absorption at the L-edge of Si (99.8   eV) with a drastic increase of transmittance from 8% to 48%.
Source: Journal of Synchrotron Radiation - Category: Physics Authors: Tags: ellipsoidal mirror soft X-ray free-electron laser saturable absorption optical design research papers Source Type: research

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