Fourier transform holography with extended references using a coherent ultra-broadband light source

Tenner, Vasco T.; Eikema, K.S.E.; Witte, Stefan

doi:10.1364/oe.22.025397

Cited by 15 publications

(10 citation statements)

References 34 publications

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“…Furthermore, the high repetition rate of these systems enabled coincidence detection of fragments after strong‐field ionization at 0.4 MHz repetition rate and recording photoion‐photoion‐coincidence spectra of molecular fragments after inner‐shell XUV excitation . In future many more applications, such as photoelectron spectroscopy, coherent control in ionization and XUV microscopy approaches, will benefit from the increased average power of modern few‐cycle lasers and secondary sources in the XUV.…”

Section: Discussionmentioning

confidence: 99%

High Average Power Near‐Infrared Few‐Cycle Lasers

Rothhardt

Hädrich

Delagnes

et al. 2017

Laser & Photonics Reviews

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Ultra-short laser pulses with only a few optical cycles duration have gained increasing importance during the recent decade and are currently employed in many laboratories worldwide. In addition, modern laser technology nowadays can provide few-cycle pulses at very high average power which advances established studies and opens exciting novel research opportunities. In this paper, the two complementary approaches for providing few-cycle pulses at high average power, namely optical parametric amplification and nonlinear pulse compression, are reviewed and compared. In addition, their limitations and future scaling potential are discussed. Furthermore, selected applications particularly taking advantage of the high average power and high repetition rate are presented.

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Section: Discussionmentioning

confidence: 99%

High Average Power Near‐Infrared Few‐Cycle Lasers

Rothhardt

Hädrich

Delagnes

et al. 2017

Laser & Photonics Reviews

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“…Broadband iterative phase retrieval. In a second step, we refine the reconstructed object by an iterative phase retrieval algorithm 43 , which enhances the resolution and signal-to-noise ratio of the reconstruction 44,45 . Methods to reconstruct the phase for broadband diffraction patterns have already been developed, but require a precise measurement of the spectrum 28,30 .…”

Section: Resultsmentioning

confidence: 99%

Towards attosecond imaging at the nanoscale using broadband holography-assisted coherent imaging in the extreme ultraviolet

et al. 2021

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Nanoscale coherent imaging has emerged as an indispensable modality, allowing to surpass the resolution limit given by classical imaging optics. At the same time, attosecond science has experienced enormous progress and has revealed the ultrafast dynamics in complex materials. Combining attosecond temporal resolution of pump-probe experiments with nanometer spatial resolution would allow studying ultrafast dynamics on the smallest spatio-temporal scales but has not been demonstrated yet. To date, the large bandwidth of attosecond pulses poses a major challenge to high-resolution coherent imaging. Here, we present broadband holography-enhanced coherent imaging, which enables the combination of high-resolution coherent imaging with a large spectral bandwidth. By implementing our method at a high harmonic source, we demonstrate a spatial resolution of 34 nm in combination with a spectral bandwidth of 5.5 eV at a central photon energy of 92 eV. The method is single-shot capable and retrieves the spectrum from the measured diffraction pattern.

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“…Over the last few years, HS coherent diffractive imaging (HSCDI) shows a strong progress, for instance, in high-resolution microscopy. Interference between reference and object wavefronts registered as intensity diffraction patterns is used conventionally in spectrally resolved interferometry, 1,2 Fourier transform holography, 3,4 and HS digital holography. 2,5,6 Along with the traditional intensity imaging, HSCDI provides phase imaging, which brings additional information about an object under investigation, e.g., label-free multispectral refractive index estimation.…”

Section: Introductionmentioning

confidence: 99%

Hyperspectral phase retrieval: spectral–spatial data processing with sparsity-based complex domain cube filter

2021

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Hyperspectral (HS) imaging retrieves information from data obtained across broadband spectral channels. Information to retrieve is a 3D cube, where two coordinates are spatial and the third one is spectral. This cube is complex-valued with varying amplitude and phase. We consider shearography optical setup, in which two phase-shifted broadband copies of the object projections are interfering at a sensor. Registered observations are intensities summarized over spectral channels. For phase reconstruction, the variational setting of the phase retrieval problem is used to derive the iterative algorithm, which includes the original proximity spectral analysis operator and the sparsity modeling of the complex-valued object 3D cube. We resolve the HS phase retrieval problem without random phase coding of wavefronts typical for the most conventional phase retrieval techniques. We show the performance of the algorithm for object phase and thickness imaging in simulation and experimental tests. © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Fourier transform holography with extended references using a coherent ultra-broadband light source

Cited by 15 publications

References 34 publications

High Average Power Near‐Infrared Few‐Cycle Lasers

High Average Power Near‐Infrared Few‐Cycle Lasers

Towards attosecond imaging at the nanoscale using broadband holography-assisted coherent imaging in the extreme ultraviolet

Hyperspectral phase retrieval: spectral–spatial data processing with sparsity-based complex domain cube filter

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