title: Sub-500  nm hard x ray focusing by compound long kinoform lenses.
abstract: The focusing performance of polymethyl methacrylate compound long kinoform lenses with 70 μm aperture and 19.5 mm focal length was characterized with 8 keV x rays using the knife-edge scan method at the 4W1A transmission x-ray microscope beamline of Beijing Synchrotron Radiation Facility. The experiment result shows a best FWHM focus size of 440 nm with 31% diffraction efficiency.
authors.forename: Keliang
authors.initials: K
authors.lastname: Liao
authors.forename: Jing
authors.initials: J
authors.lastname: Liu
authors.forename: Hao
authors.initials: H
authors.lastname: Liang
authors.forename: Xuehui
authors.initials: X
authors.lastname: Wu
authors.forename: Kai
authors.initials: K
authors.lastname: Zhang
authors.forename: Qingxi
authors.initials: Q
authors.lastname: Yuan
authors.forename: Futing
authors.initials: F
authors.lastname: Yi
authors.forename: Weifan
authors.initials: W
authors.lastname: Sheng