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Single-shot tomographic movies of evolving light-velocity objects.

Li Z, Zgadzaj R, Wang X, Chang YY, Downer MC - Nat Commun (2014)

Bottom Line: Tomography--cross-sectional imaging based on measuring radiation transmitted through an object along different directions--enables non-invasive imaging of hidden stationary objects, such as internal bodily organs, from their sequentially measured projections.Here we adapt tomographic methods to visualize--in one laser shot--the instantaneous structure and evolution of a laser-induced object propagating through a transparent Kerr medium.Our technique could potentially visualize, for example, plasma wakefield accelerators, optical rogue waves or fast ignitor pulses, light-velocity objects, whose detailed space-time dynamics are known only through intensive computer simulations.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, University of Texas at Austin, 1 University Station, C1600, 2512 Speedway, Austin, Texas 78712-1081, USA.

ABSTRACT
Tomography--cross-sectional imaging based on measuring radiation transmitted through an object along different directions--enables non-invasive imaging of hidden stationary objects, such as internal bodily organs, from their sequentially measured projections. Here we adapt tomographic methods to visualize--in one laser shot--the instantaneous structure and evolution of a laser-induced object propagating through a transparent Kerr medium. We reconstruct 'movies' of a laser pulse's diffraction, self-focusing and filamentation from phase 'streaks' imprinted onto probe pulses that cross the main pulse's path simultaneously at different angles. Multiple probes are generated and detected compactly and simply, making the system robust, easy to align and adaptable to many problems. Our technique could potentially visualize, for example, plasma wakefield accelerators, optical rogue waves or fast ignitor pulses, light-velocity objects, whose detailed space-time dynamics are known only through intensive computer simulations.

No MeSH data available.


Related in: MedlinePlus

Phase streaks induced by the evolving index profile.Epu=0.7 μJ and projection angles are φ=1.0°, 27°, −25° (top row), and −65° and 68° (bottom). Vertical (horizontal) scales denote transverse (longitudinal) position of the pump-induced phase streak within the temporally stretched probe pulse profile. The right-most end of each streak corresponds to the entrance of the medium; xpr==0 is approximately the midpoint of the pump pulse propagation through the Kerr medium. The spectrometer slit was centred on the images that L2 projected at the spectrometer entrance. Colour bars give phase shift in rad.
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f5: Phase streaks induced by the evolving index profile.Epu=0.7 μJ and projection angles are φ=1.0°, 27°, −25° (top row), and −65° and 68° (bottom). Vertical (horizontal) scales denote transverse (longitudinal) position of the pump-induced phase streak within the temporally stretched probe pulse profile. The right-most end of each streak corresponds to the entrance of the medium; xpr==0 is approximately the midpoint of the pump pulse propagation through the Kerr medium. The spectrometer slit was centred on the images that L2 projected at the spectrometer entrance. Colour bars give phase shift in rad.

Mentions: Figure 5 shows five phase streaks for Epu=0.7 μJ. Small φ streaks (top row) highlight evolution of the object’s transverse (xob) profile. Oscillations in transverse radius Δxob and peak index change Δnmax, indicating dynamic balance between self-focusing and defocusing, were evident in the last ~1/3 of these streaks. Streaks near φ~70° (bottom row) highlight evolution of its longitudinal () profile, which remained nearly constant due to the low dispersion of fused silica. To visualize evolution of the object’s full Δn(, xob, y0, tob) profile, we tomographically reconstructed a movie from all five streaks using the ART algorithm252829.


Single-shot tomographic movies of evolving light-velocity objects.

Li Z, Zgadzaj R, Wang X, Chang YY, Downer MC - Nat Commun (2014)

Phase streaks induced by the evolving index profile.Epu=0.7 μJ and projection angles are φ=1.0°, 27°, −25° (top row), and −65° and 68° (bottom). Vertical (horizontal) scales denote transverse (longitudinal) position of the pump-induced phase streak within the temporally stretched probe pulse profile. The right-most end of each streak corresponds to the entrance of the medium; xpr==0 is approximately the midpoint of the pump pulse propagation through the Kerr medium. The spectrometer slit was centred on the images that L2 projected at the spectrometer entrance. Colour bars give phase shift in rad.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3921466&req=5

f5: Phase streaks induced by the evolving index profile.Epu=0.7 μJ and projection angles are φ=1.0°, 27°, −25° (top row), and −65° and 68° (bottom). Vertical (horizontal) scales denote transverse (longitudinal) position of the pump-induced phase streak within the temporally stretched probe pulse profile. The right-most end of each streak corresponds to the entrance of the medium; xpr==0 is approximately the midpoint of the pump pulse propagation through the Kerr medium. The spectrometer slit was centred on the images that L2 projected at the spectrometer entrance. Colour bars give phase shift in rad.
Mentions: Figure 5 shows five phase streaks for Epu=0.7 μJ. Small φ streaks (top row) highlight evolution of the object’s transverse (xob) profile. Oscillations in transverse radius Δxob and peak index change Δnmax, indicating dynamic balance between self-focusing and defocusing, were evident in the last ~1/3 of these streaks. Streaks near φ~70° (bottom row) highlight evolution of its longitudinal () profile, which remained nearly constant due to the low dispersion of fused silica. To visualize evolution of the object’s full Δn(, xob, y0, tob) profile, we tomographically reconstructed a movie from all five streaks using the ART algorithm252829.

Bottom Line: Tomography--cross-sectional imaging based on measuring radiation transmitted through an object along different directions--enables non-invasive imaging of hidden stationary objects, such as internal bodily organs, from their sequentially measured projections.Here we adapt tomographic methods to visualize--in one laser shot--the instantaneous structure and evolution of a laser-induced object propagating through a transparent Kerr medium.Our technique could potentially visualize, for example, plasma wakefield accelerators, optical rogue waves or fast ignitor pulses, light-velocity objects, whose detailed space-time dynamics are known only through intensive computer simulations.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, University of Texas at Austin, 1 University Station, C1600, 2512 Speedway, Austin, Texas 78712-1081, USA.

ABSTRACT
Tomography--cross-sectional imaging based on measuring radiation transmitted through an object along different directions--enables non-invasive imaging of hidden stationary objects, such as internal bodily organs, from their sequentially measured projections. Here we adapt tomographic methods to visualize--in one laser shot--the instantaneous structure and evolution of a laser-induced object propagating through a transparent Kerr medium. We reconstruct 'movies' of a laser pulse's diffraction, self-focusing and filamentation from phase 'streaks' imprinted onto probe pulses that cross the main pulse's path simultaneously at different angles. Multiple probes are generated and detected compactly and simply, making the system robust, easy to align and adaptable to many problems. Our technique could potentially visualize, for example, plasma wakefield accelerators, optical rogue waves or fast ignitor pulses, light-velocity objects, whose detailed space-time dynamics are known only through intensive computer simulations.

No MeSH data available.


Related in: MedlinePlus