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Opt Lett. 2009 Mar 1;34(5):650-2.

Optimal signal-to-noise ratios for soft x-ray lensless imaging.

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Department of Applied Physics, Stanford University, Stanford, CA 94305, USA.


We propose and demonstrate a method to gauge and optimize the signal-to-noise ratios (SNRs) in lensless imaging using partially coherent sources. Through spatial filtering we tuned the coherence width of an incoherent soft x-ray undulator source, and we deduce that there exists an optimal spatial filter setting for imaging micrometer-sized objects, while high-resolution imaging is best executed without spatial filtering. Our SNR analysis, given spatial coherence, allows for an estimation of the required exposure time at synchrotron sources and pulse fluence at x-ray laser sources.


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