Abstract
Coherent Diffractive Imaging (CDI) is performed with single and multiple harmonics from an ultrafast HHG source. The effect of HHG source bandwidth on the effectiveness of the reconstruction algorithms is compared. A low quality reconstruction from broadband data is achieved assuming full coherence in the algorithm.
Highlights
To investigate nano-scale structures, the Abbe diffraction limit [1] suggests that the wavelength of the probe may be decreased to improve resolution
The source would produce equivalent fringe visibility to a fully temporal coherent signal and yield a Coherent Diffractive Imaging (CDI) solution if the incoherence is not sampled in the diffraction pattern i.e. the coherence length is longer than the object plus zero padding [3]
We show that high resolution images acquired with high temporal coherence (1.8% rel. bandwidth) are approximated by images acquired with harmonic spectra whose envelope has 13% relative bandwidth when the latter are reconstructed assuming full temporal coherence
Summary
To investigate nano-scale structures, the Abbe diffraction limit [1] suggests that the wavelength of the probe may be decreased to improve resolution. The source would produce equivalent fringe visibility to a fully temporal coherent signal and yield a CDI solution if the incoherence is not sampled in the diffraction pattern i.e. the coherence length is longer than the object plus zero padding [3]. It has been shown [4] that for a broad continuous spectrum, phase retrieval algorithms fail to reconstruct if full coherence is assumed. The reconstructions are not stable, but show more detail than would be expected for a continuous broad spectrum
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