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High efficiency, high quality x-ray optic based on ellipsoidally bent highly oriented pyrolytic graphite crystal for
I Uschmann1, U Nothelle, E Förster
1Institut för Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, D-07743 Jena, Germany. uschmann@ioq.uni-jena.de
Applied Optics
|August 27, 2005
Summary
A novel ellipsoidal bent crystal optic using highly oriented pyrolytic graphite (HOPG) significantly enhances X-ray focusing efficiency for ultrafast time-resolved measurements.
Area of Science:
- Materials Science
- Optics
- Physics
Background:
- Bent crystals are crucial for focusing X-rays in various scientific applications.
- Previous crystal optics had limitations in focusing efficiency and temporal resolution.
Purpose of the Study:
- To develop and evaluate a new X-ray optic for enhanced focusing efficiency.
- To assess the suitability of this optic for ultrafast time-resolved X-ray measurements.
Main Methods:
- Utilized a thin, highly oriented pyrolytic graphite (HOPG) crystal bent into an ellipsoidal shape.
- Focused monochromatic X-rays at 4.5 keV photon energy from an isotropic Ti K alpha source.
- Measured the focal spot size and rocking curve width (FWHM) of the crystal.
Main Results:
- Achieved an X-ray focusing efficiency of 0.0033, 30 times greater than previous methods.
- Focused Ti K alpha radiation from a 150 micrometer source to a 450 micrometer spot.
- Determined the rocking curve width (FWHM) of the HOPG crystal to be 0.11 degrees.
- Estimated temporal broadening of ultrashort K alpha pulses to be no more than 300 fs.
Conclusions:
- The novel ellipsoidal bent HOPG crystal optic offers significantly improved X-ray focusing efficiency.
- Its properties, including minimal temporal broadening, make it highly suitable for ultrafast time-resolved X-ray science.