X-ray imaging and adaptive optics system for a 13.5nm telescope

Details X-ray imaging and adaptive optics system for a 13.5nm telescope X-ray imaging and adaptive optics system for a 13.5nm telescope

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007spie.6688e..39k&link_type=abstract

Optics for EUV, X-Ray, and Gamma-Ray Astronomy III. Edited by O'Dell, Stephen L.; Pareschi, Giovanni. Proceedings of the SPIE, V

Physics

Optics

Scientific paper

We are developing a normal incident X-ray telescope with an adaptive optics system in order to achieve an unprecedented high-angular-resolution. The primary mirror with a diameter of 80mm is a spherical shape with a focal length of 2000 mm, which was coated by Mo/Si multilayer. The secondary mirror is a deformable mirror with 55 mm diameter, which was also coated by Mo/Si multilayer. Optical lights from a pin-hole were measured by a wave-front sensor and used as a reference for a correction of the deformable mirror. All the components were installed in a vacuum chamber. A closed loop control with the wave front sensor and the deformable mirror was successfully performed in the telescope and we confirmed the correction of the wave front. The rms-deviation of a performed wave front from a target shape during the control was ~30 nm-rms, whereas it without control was more than ~80 nm-rms. A 13.5 nm X-ray from an electron impact X-ray source was imaged on a backside CCD installed on a focal plane. A mesh made by steel was installed in front of the X-ray source, whose pitch and wire-thickness are 500 micro-m and 50 micro-m. The image of this mesh by optical lights from the X-ray generator is detected by the CCD. The current image quality is ~2.4 arc-sec and this was comparable to a diffraction limit of an optical wave length with our 80mm primary mirror.

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