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Single-shot spatial coherence characterization of x-ray ultrafast sources

Joana Duarte 1 Aura Inés Gonzalez 1 Rémy Cassin 1 Rana Nicolas 1 Maria Kholodstova 1 Willem Boutu 1 Marta Fajardo 2 Merdji Hamed 1 
1 ATTO - Attophysique
IRAMIS - Institut Rayonnement Matière de Saclay, LIDyl - Laboratoire Interactions, Dynamiques et Lasers (ex SPAM)
Abstract : Spatial coherence is an impactful source parameter in many applications ranging from atomic and molecular physics to metrology or imaging. In lensless imaging, for example, it can strongly affect the image formation, especially when the source exhibits shot-to-shot variations. Single-shot characterization of the spatial coherence length of a source is thus crucial. However, current techniques require either parallel intensity measurements or the use of several masks. Based on the method proposed by González et al. [J. Opt. Soc. Am. A 28, 1107 (2011)], we designed a specific arrangement of a two-dimensional non-redundant array of apertures, which allows, through its far field interference pattern, for a singleshot measurement of the spatial coherence, while being robust against beam-pointing instabilities. The strategic configuration of the pinholes allows us to disentangle the degree of spatial coherence from the intensity distribution, thus removing the need for parallel measurement of the beam intensity. An experimental validation is performed using a high-harmonic source. A statistical study in different regimes shows the robustness of the method.
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Submitted on : Thursday, April 1, 2021 - 10:54:50 AM
Last modification on : Sunday, June 26, 2022 - 3:06:47 AM



Joana Duarte, Aura Inés Gonzalez, Rémy Cassin, Rana Nicolas, Maria Kholodstova, et al.. Single-shot spatial coherence characterization of x-ray ultrafast sources. Optics Letters, Optical Society of America - OSA Publishing, 2021, 46 (7), pp.1764. ⟨10.1364/OL.413643⟩. ⟨cea-03187569⟩



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