Multi-mode root preserving ptychographic phase retrieval algorithm for dispersion scan

Wilhelm, Alex M.; Schmidt, David; Adams, Daniel E.; Durfee, Charles G.

doi:10.1364/oe.426859

Cited by 9 publications

(5 citation statements)

References 27 publications

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“…This result was compared against the full pulse characterization technique Dispersion Scan. [28][29][30] The Dispersion Scan was taken over the same grating positions and shows a peak intensity at the same grating position as was found by the WD-SPIFI optimization. Running the dispersion scan through its iterative phase retrieval algorithm showed a temporal pulse width of 209 fs and confirms the optimal location of the grating found in WD-SPIFI.…”

Section: Resultsmentioning

confidence: 99%

Enhanced resolution dispersion optimized multiphoton microscopy with spatial frequency modulation imaging

Scarbrough

Thomas

Field

et al. 2023

Multiphoton Microscopy in the Biomedical Sciences XXIII

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Using the structured illumination, single pixel detection imaging technique SPatIal Frequency modulation Imaging (SPIFI), we demonstrate a cascaded Wavelength Domain and Spatial Domain (WD-SD-SPIFI) system enabling real-time, in-line, second order dispersion compensation optimization for multiphoton imaging. Enhanced resolution is demonstrated by imaging a sub-diffractive 140 nm fluorescent nanodiamond with Two Photon Excitation Fluorescence (2PEF) to measure the Point Spread Function (PSF). With a 1034 nm pulsed laser through a Numerical Aperture (NA) of 0.5, a PSF Full Width at Half Max (FWHM) of 780 nm was measured with minimal post processing analysis that only requires Fast Fourier Transforms (FFTs).

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Section: Resultsmentioning

confidence: 99%

Enhanced resolution dispersion optimized multiphoton microscopy with spatial frequency modulation imaging

Scarbrough

Thomas

Field

et al. 2023

Multiphoton Microscopy in the Biomedical Sciences XXIII

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“…Our analysis generates a ray trace of each spectral component of the chirped pulse as well as the location of the beam waist for each spectral component. Once the precise location of the focus is determined, a second harmonic crystal can be placed at the focus and a dispersion scan can be performed to optimize compression at the focus [51,52]. During the campaign, a 34 µm spot size with a 90 fs duration with energy ranging from 750 mJ to 1.9 J was achieved, resulting in intensities from 2.39 × 10 18 W/cm 2 to 6 × 10 18 W/cm 2 and ponderomotive potentials of 143 keV to 362 keV.…”

Section: Optical Setup and Experimental Demonstration Of Ponderomotiv...mentioning

confidence: 99%

“…After making this measurement at several transverse planes along the optical axis, analysis yields a ray trace of each spectral component of the chirped pulse as well as the location of the beam waist for each spectral component. Once the precise location of the focus is determined, a second harmonic crystal can be placed at the focus and a dispersion scan can be performed to optimize compression of the pulse at the focus by varying the separation of the first grating pair [51,52].…”

Section: A3 Knife Edge and Dispersion Scanmentioning

confidence: 99%

Ponderomotive snowplow electron acceleration with high energy tilted ultrafast laser pulses

Hunt,

Wilhelm,

Adams

et al. 2024

Preprint

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The application high intensity ultrafast lasers to compact plasma-based electron accelerators has recently been an extremely active area of research. Here, for the first time, we show experimentally and theoretically that carefully sculpting an intense ultrafast pulse in the spatio-temporal domain allows ponderomotive pressure to be used for direct acceleration of electron bunches from rest to relativistic energies. With subluminal group velocity and above-threshold intensity, a laser pulse can capture and accelerate electrons, pushing on them like a snowplow. Acceleration of electrons from rest requires a substantial reduction of group velocity. In this demonstration experiment, we achieve a group velocity of ∼0.6c in a tilted pulse by focusing the output of a novel asymmetric pulse compressor we developed for the petawatt-class ALEPH system at Colorado State University. This direct laser-electron approach opens a route towards exploiting optical spatio-temporal control techniques to sculpt electron beams with desired properties such as narrow energy and angular distributions. The tilted-pulse snowplow technique can be scaled from small-scale to facility-scale amplifiers to produce short electron bunches in the 10 keV−10 MeV range for applications including ultrafast electron diffraction and efficient injection into laser wakefield accelerators for acceleration beyond the GeV level.

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“…This result was compared against the full pulse characterization technique, dispersion scan. 43 – 45 The dispersion scan was taken over the same grating positions and shows a peak intensity at the same grating position as found by the WD-SPIFI optimization. Running the dispersion scan through its iterative phase retrieval algorithm showed a temporal pulse width of 209 fs and confirms the optimal location of the grating found in WD-SPIFI.…”

Section: System Performancementioning

confidence: 99%

Cascaded domain multiphoton spatial frequency modulation imaging

Scarbrough,

Thomas,

Field

et al. 2023

J. Biomed. Opt.

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.SignificanceMultiphoton microscopy is a powerful imaging tool for biomedical applications. A variety of techniques and respective benefits exist for multiphoton microscopy, but an enhanced resolution is especially desired. Additionally multiphoton microscopy requires ultrafast pulses for excitation, so optimization of the pulse duration at the sample is critical for strong signals.AimWe aim to perform enhanced resolution imaging that is robust to scattering using a structured illumination technique while also providing a rapid and easily repeatable means to optimize group delay dispersion (GDD) compensation through to the sample.ApproachSpatial frequency modulation imaging (SPIFI) is used in two domains: the spatial domain (SD) and the wavelength domain (WD). The WD-SPIFI system is an in-line tool enabling GDD optimization that considers all material through to the sample. The SD-SPIFI system follows and enables enhanced resolution imaging.ResultsThe WD-SPIFI dispersion optimization performance is confirmed with independent pulse characterization, enabling rapid optimization of pulses for imaging with the SD-SPIFI system. The SD-SPIFI system demonstrates enhanced resolution imaging without the use of photon counting enabled by signal to noise improvements due to the WD-SPIFI system.ConclusionsImplementing SPIFI in-line in two domains enables full-path dispersion compensation optimization through to the sample for enhanced resolution multiphoton microscopy.

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Multi-mode root preserving ptychographic phase retrieval algorithm for dispersion scan

Cited by 9 publications

References 27 publications

Enhanced resolution dispersion optimized multiphoton microscopy with spatial frequency modulation imaging

Enhanced resolution dispersion optimized multiphoton microscopy with spatial frequency modulation imaging

Ponderomotive snowplow electron acceleration with high energy tilted ultrafast laser pulses

Cascaded domain multiphoton spatial frequency modulation imaging

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