Moving the Frontier of Quantum Control into the Soft X-Ray Spectrum
Figure 2
(a) A pictorial diagram of an asymmetrically cut multilayer with cut angle . (b) An atomic force micrograph of the surface of the asymmetrically cut multilayer. The periodic structure observed on the surface is due to the individual layers in the multilayer. These bilayers act as a high period grating. Also seen are striations left after polishing. As the asymmetrically cut multilayer is a volumetric grating, the surface imperfections have little effect on the overall efficiency and dispersion. (c) Reflectivity measurements of the dispersion from an asymmetrically cut multilayer conducted at beamline 6.3.2 at the Advanced Light Source. The multilayer cut angle was 5.4 degrees, and the measurement was conducted 5 degrees from normal of the top surface of the mirror. This particular asymmetrically cut multilayer corresponds to a grating d-spacing of ~70 nm and had >95% efficiency into the 1st order.
