München 2019 – scientific programme

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K: Fachverband Kurzzeit- und angewandte Laserphysik

K 1: New Optical Methods

K 1.2: Talk

Monday, March 18, 2019, 17:10–17:30, HS 3

An optical Talbot-Interferometer for phase-contrast imaging of a gas jet — •Bernhard Akstaller, Max Schuster, Andreas Wolf, Tim Kalkus, Maria Seifert, Gisela Anton, and Stefan Funk — ECAP - Erlangen Centre for Astroparticle Physics, University Erlangen-Nürnberg, Erwin-Rommel-Str. 1, 91058 Erlangen

The Talbot effect was discovered as early as 1836 and can be used for Phase Contrast Imaging. This contribution treats an optical Talbot interferometer with both absorption- and phase-gratings which is used for the retrieval of the phase shift in full-field images of a butane gas stream in ambient air.

Phase-contrast imaging is a well-established method for high spatial resolution measurements at synchrotron beamlines in the X-ray regime [1,2]. An optical laser beam provides monochromatic conditions which are comparable to synchrotron or XFEL radiation. The optical Talbot-interferometer is an inexpensive and easily available tool that allows verification of simulations which are scalable towards the X-ray regime. The long-term goal of this work is an imaging technique for electron density distributions in optically transparent plasma shock waves with relevance in laboratory astrophysics.

[1] Schropp, A., et al. Sc. rep. 5 (2015): 11089. [2] Baran, P., et al. Phys. Med. Biol. 62.6 (2017): 2315.