Publications by authors named "V Yunkin"
A coherent X-ray beam expander based on a multilens interferometer is proposed in this paper. The multilens interferometer allows efficient generation of a highly diverging coherent beam up to several milliradians in the hard X-ray energy range. The optical properties of the interferometer were experimentally demonstrated at the ESRF ID13 undulator beamline (Grenoble, France), using 12.
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- A phase-sensitive X-ray imaging method using a bilens interferometer has been developed for high-resolution imaging.
- The technique involves scanning a sample positioned in front of one lens in the interferometer and measuring changes in the interference pattern with a high-resolution detector.
- Experimental tests on fibers of various sizes confirm the method's effectiveness, yielding consistent results with theoretical predictions and highlighting potential applications and future enhancements.
We demonstrate that ion-beam lithography can be applied to the fabrication of rotationally parabolic refractive diamond X-ray micro-lenses that are of interest to the field of high-resolution X-ray focusing and microscopy. Three single half-lenses with curvature radii of 4.8 µm were produced and stacked to form a compound refractive lens, which provided diffraction-limited focusing of X-ray radiation at the P14 beamline of PETRA-III (DESY).
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- Full-field X-ray imaging and microscopy were successfully performed using polymer compound refractive nano-lenses, achieving a resolution of 100 nm at the European Synchrotron's beamline ID13.
- The lenses maintained functionality after exposure to an absorbed dose of approximately 10 Gy, indicating their durability under X-ray radiation.
- The article addresses challenges such as lens aberrations and astigmatism while exploring potential improvements to enhance lens performance in nano-focusing and compact X-ray microscopy applications.
The present work demonstrates the potential applicability of additive manufacturing to X-Ray refractive nano-lenses. A compound refractive lens with a radius of 5 µm was produced by the two-photon polymerization induced lithography. It was successfully tested at the X-ray microfocus laboratory source and a focal spot of 5 μm was measured.
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