Frankfurt 2006 – wissenschaftliches Programm

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Q: Quantenoptik und Photonik

Q 54: Anwendung ultrakurzer Lichtimpulse und Attosekundphysik II

Q 54.6: Vortrag

Mittwoch, 15. März 2006, 15:15–15:30, HIV

Tabletop X-Ray Microscope — •David Schäfer, Thomas Nisius, and Stefan Rausch — Institute for X-Optics, University of Applied Sciences Koblenz, RheinAhrCampus Remagen, Südalle 2, D-53424 Remagen

We present a tabletop full-field transmission X-ray microscope with a compact laser plasma source and diffractive zone plate imaging system for sub-100nm resolution in the water window region (λ=2.3-4.4nm). As a result of the large absorption differences between carbon and oxygen in this region, a high contrast between protein and water allows to analyse biological specimen in their natural state.

The operation wavelength (λ=2.48nm) is generated by focussing short laser pulses with an energy of 300mJ on a cryogenic liquid nitrogen jet target of 20µm diameter. The optical setup consists of a condenser zone plate (KZP7) in conjunction with an order sorting aperture to provide monochromatic sample-illumination. This allows also for easy wavelength tuning within the N2 emission spectrum. A micro zone plate generates a magnified image which is detected by a back-illuminated TE-cooled CCD-Camera (1340x1300pixel). With the actual configuration a magnification up to 1000 at exposure times of a few minutes can be achieved.