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K: Fachverband Kurzzeitphysik

K 2: Strahlungsquellen und deren Anwendungen - Attosekundenexperimente

K 2.3: Talk

Monday, March 17, 2014, 17:15–17:30, SPA SR203

Applications of a table-top laser-induced plasma source emitting in the soft x-ray range — •Matthias Müller — Laser-Laboratorium Göttingen e.V., Hans-Adolf-Krebs Weg 1, 37077 Göttingen, Deutschland

The spectral range of the 'water window' (λ = 2.3 to 4.4 nm) represents a highly interesting regime for studying carbon-based specimen, due to a 10 times higher absorption of carbon compared to oxygen and water. This opens up a variety of applications, e.g. high resolution microscopy and near-edge x-ray absorption fine structure (NEXAFS) spectroscopy. These studies are typically conducted at synchrotons; however, as the interest in imaging techniques and surface sensitive chemical analytics is growing, there is also a considerable demand for compact lab-based soft x-ray sources.

In this talk, an overview on the soft x-ray activities of the Laser-Laboratorium Göttingen based on laser-driven plasma emission from pulsed gas jets is given. Results of NEXAFS measurements at the carbon K-edge (λ = 4.4 nm) and calcium L-edge (λ = 3.58 nm) are presented, along with a brief description of a table-top soft x-ray microscope using monochromatic radiation at 2.88 nm wavelength. Furthermore, caustic measurements are presented in order to characterize the imaging performance of the ellipsoidal condenser optic employed in the microscope.