title: Quantum-dot-array diffraction grating with single order diffraction property for soft x-ray region.
abstract: A gold transmission grating is used routinely to disperse the x-ray spectrum at the Z soft x-ray facility to measure the spectrum and temporal history of the absolute soft x-ray power emitted from z-pinch and hohlraum radiation sources. A quantum-dot-array diffraction grating (QDADG) of 250 lines/mm for soft x-ray is designed and fabricated for the first time according to the principle of binary sinusoidal transmission grating. The diffraction efficiencies of the grating are measured in the 150-300 eV photon energy range on the Beamline 3W1B of Beijing Synchrotron Radiation Facility. This article describes the basic concept and calibration techniques and presents calibration results. It is shown that the 250 lines/mm QDADG can be used to disperse light without higher-order diffractions in soft x-ray range, and the diffraction efficiencies of this grating are nearly constant (about 25%), which is beneficial in the spectrum analysis.
authors.affiliation: Key Laboratory of Plasma Science and Technology, Research Center of Laser Fusion, China Academy of Engineering Physics, P.O. Box 919-986, Mianyang, Sichuan 621900, People's Republic of China.
authors.forename: Longyu
authors.initials: L
authors.lastname: Kuang
authors.forename: Chuanke
authors.initials: C
authors.lastname: Wang
authors.forename: Zhebin
authors.initials: Z
authors.lastname: Wang
authors.forename: Leifeng
authors.initials: L
authors.lastname: Cao
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Zhu
authors.forename: Changqing
authors.initials: C
authors.lastname: Xie
authors.forename: Shenye
authors.initials: S
authors.lastname: Liu
authors.forename: Yongkun
authors.initials: Y
authors.lastname: Ding