Laser-heating-based active optics for synchrotron radiation applications

Abstract

Active optics has attracted considerable interest from researchers in synchrotron radiation facilities because of its capacity for x-ray wavefront correction. Here, we report a novel and efficient technique for correcting or modulating a mirror surface profile based on laser-heating-induced thermal expansion. An experimental study of the characteristics of the surface thermal deformation response indicates that the power of a milliwatt laser yields a bump height as low as the subnanometer scale and that the variation of the spot size modulates the response function width effectively. In addition, the capacity of the laser-heating technique for free-form surface modulation is demonstrated via a one-dimensional surface correction experiment. The developed method is a promising new approach toward effective x-ray active optics coupled with at-wavelength metrology techniques.

Third-order aberration of soft X-ray optical systems with orthogonal and coplanar arrangement of the main planes of elements

“…The imaging resolution of a soft X-ray optical system is a key factor determining the working performance of the large scientific apparatus applying the optical system, such as synchrotron radiation sources, soft X-ray microscopes, etc. (Veyrinas et al, 2019;Fogelqvist et al, 2017;Yang et al, 2016). For soft X-ray optical systems, researchers need to adopt rays with a grazing-incidence impinged optical surface in order to gain a sufficiently high optical transmission.…”