Single order x-ray diffraction with binary sinusoidal transmission grating

et al. 2008

A novel phase-type quantum-dot-array diffraction grating (QDADG) is reported. In contrast to an earlier amplitude-type QDADG [C. Wang et al., Rev. Sci. Instrum. 78, 053503 (2007)], the new phase-type QDADG would remove the zeroth order diffraction at some certain wavelength, as well as suppressing the higher-order diffractions. In this paper, the basic concept, the fabrication, the calibration techniques, and the calibration results are presented. Such a grating can be applied in the research fields of beam splitting, laser probe diagnostics, and so on.

Section: Introductionmentioning

confidence: 99%

Phase-type quantum-dot-array diffraction grating

et al. 2008

“…14 Using a large number of pinholes distributed appropriately instead of concentric rings as the diffractive element, this photon sieve can effectively restrain the high-order diffractions to realize better focusing and imaging in the x-ray region. Based on the photon sieve principle, the proposal using quantum dots array to realize a binary sinusoidal transmission grating had been proposed by Cao et al 15 A large number of quantum dots, distributed as sinusoidal function on a substrate, could be used to diffract x-rays without higher-order diffraction. Based on this proposal, a binary sinusoidal transmission grating, which was also called quantum-dot-array diffraction grating ͑QDADG͒ for visible light ͑25 lines/mm͒, had been developed and characterized.…”

Section: Quantum-dot-array Diffraction Grating With Single Order Diffmentioning

confidence: 99%

Quantum-dot-array diffraction grating with single order diffraction property for soft x-ray region

et al. 2010

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.

“…Recently, a new concept of x-ray dispersive element named as quantum-dot-array diffraction grating ͑QDADG͒ has been proposed by L. F. Cao et al 12,13 A large number of quantum dots distributed on a substrate as sinusoidal function can be used to diffract x rays without higher-order diffraction. Based on the concept, a QDADG for visible light is developed for the first time as described in this article.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the diffraction properties of quantum-dot-array diffraction grating

et al. 2007

A new dispersive element named as quantum-dot-array diffraction grating [L. F. Cao, China patent No. 200410081499 (August 10, 2004)] for visible light has been developed and characterized experimentally. A large number of quantum dots distributed on a substrate as sinusoidal function can be used to diffract x rays without higher-order diffraction. The experimental patterns show that the higher-order diffractions which inevitably exist in the spectrum recorded using traditional diffraction gratings can be eliminated effectively by this newly designed element. It indicates that quantum-dot-array diffraction grating could be an attractive alternative of presently used diffraction grating in soft x-ray spectroscopy application to get rid of the higher-order diffraction distortions.