Spatial characterization of the focus produced by an EUV Schwarzschild objective
Abstract
Schwarzschild objectives are used in the EUV spectral range because of their large aperture, high mechanical stability and excellent achromaticity. The large aperture results in a small, theoretically diffraction limited focus diameter with ideal values of below 200 nm with the current configuration. We employed a zone plate with matched numerical aperture (0.19) to image the focus onto an X-ray CCD camera. Emission from high harmonic generation and a liquid-jet laser-plasma were used as light sources. Images at magnifications of about 150-fold were acquired and focus diameters of 300 nm (FWHM) were observed.
- Publication:
-
Journal of Physics Conference Series
- Pub Date:
- April 2014
- DOI:
- 10.1088/1742-6596/499/1/012008
- Bibcode:
- 2014JPhCS.499a2008E