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Title: Wavefront preserving and high efficiency diamond grating beam splitter for x-ray free electron laser

Abstract

X-ray free electron lasers (XFELs) provide femtosecond high-power x-ray beams with high spatial coherence, resulting in numerous influential discoveries. Diffractive optics allow for the easy manipulation and measurement of an x-ray beam’s wavefront and enable the realization of complex designed properties and specifications. For example, phase gratings can be used as x-ray beam splitters to enable beam sharing by multiple end stations or in-situ beam monitoring, including spectrum and wavefront measurements. Wavefront preservation and high efficiency and survivability under high power are requirements for such beam splitters. Diamond is the most suitable choice for phase grating fabrication, due to its high thermal conductivity that enables it to survive high average power XFEL beams. We have fabricated a large area (2×2 mm2) high aspect ratio (13:1) diamond grating on a diamond plate. Testing was performed at 9.5 keV and resulted in a high splitting efficiency (30%). Tunable efficiency was obtained via tilting the grating with respect to the x-ray beam. Wavefront fidelity of the split beams were measured to less than λ/100 using a Talbot wavefront sensor.

Authors:
ORCiD logo; ORCiD logo; ; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1607831
Alternate Identifier(s):
OSTI ID: 1604450
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Published Article
Journal Name:
Optics Express
Additional Journal Information:
Journal Name: Optics Express Journal Volume: 28 Journal Issue: 8; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Li, Kenan, Liu, Yanwei, Seaberg, Matthew, Chollet, Matthieu, Weiss, Thomas M., and Sakdinawat, Anne. Wavefront preserving and high efficiency diamond grating beam splitter for x-ray free electron laser. United States: N. p., 2020. Web. doi:10.1364/OE.380534.
Li, Kenan, Liu, Yanwei, Seaberg, Matthew, Chollet, Matthieu, Weiss, Thomas M., & Sakdinawat, Anne. Wavefront preserving and high efficiency diamond grating beam splitter for x-ray free electron laser. United States. doi:https://doi.org/10.1364/OE.380534
Li, Kenan, Liu, Yanwei, Seaberg, Matthew, Chollet, Matthieu, Weiss, Thomas M., and Sakdinawat, Anne. Tue . "Wavefront preserving and high efficiency diamond grating beam splitter for x-ray free electron laser". United States. doi:https://doi.org/10.1364/OE.380534.
@article{osti_1607831,
title = {Wavefront preserving and high efficiency diamond grating beam splitter for x-ray free electron laser},
author = {Li, Kenan and Liu, Yanwei and Seaberg, Matthew and Chollet, Matthieu and Weiss, Thomas M. and Sakdinawat, Anne},
abstractNote = {X-ray free electron lasers (XFELs) provide femtosecond high-power x-ray beams with high spatial coherence, resulting in numerous influential discoveries. Diffractive optics allow for the easy manipulation and measurement of an x-ray beam’s wavefront and enable the realization of complex designed properties and specifications. For example, phase gratings can be used as x-ray beam splitters to enable beam sharing by multiple end stations or in-situ beam monitoring, including spectrum and wavefront measurements. Wavefront preservation and high efficiency and survivability under high power are requirements for such beam splitters. Diamond is the most suitable choice for phase grating fabrication, due to its high thermal conductivity that enables it to survive high average power XFEL beams. We have fabricated a large area (2×2 mm2) high aspect ratio (13:1) diamond grating on a diamond plate. Testing was performed at 9.5 keV and resulted in a high splitting efficiency (30%). Tunable efficiency was obtained via tilting the grating with respect to the x-ray beam. Wavefront fidelity of the split beams were measured to less than λ/100 using a Talbot wavefront sensor.},
doi = {10.1364/OE.380534},
journal = {Optics Express},
number = 8,
volume = 28,
place = {United States},
year = {2020},
month = {3}
}

Journal Article:
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DOI: https://doi.org/10.1364/OE.380534

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