Elusive phase wave caught

Diouf, Mbaye; Burrow, Joshua A.; Toussaint, Kimani C.

doi:10.1038/s41567-022-01861-z

Nat. Phys.

2023

DOI: 10.1038/s41567-022-01861-z

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Elusive phase wave caught

Mbaye Diouf

Joshua A. Burrow

Kimani C. Toussaint

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2024

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Cited by 2 publications

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Abrupt X-to-O-wave structural field transition in presence of anomalous dispersion

Hall,

Abouraddy

2024

APL Photonics

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All linear, propagation-invariant, paraxial pulsed beams are spatiotemporally X-shaped (conical waves) in the absence of group-velocity dispersion (GVD) or in the presence of normal GVD. It is known, however, that such conical waves become O-shaped in the presence of anomalous GVD, resulting in a field profile that is circularly symmetric in space and time. To date, experiments generating conical waves in which the wavelength of a high-energy pump laser is tuned across the zero-dispersion wavelength of a nonlinear medium have not revealed the expected X-to-O-wave structural field transition. We report here an unambiguous observation of a fixed-central-wavelength X-to-O-wave structural field transition occurring in linear dispersion-free wave packets in the anomalous GVD regime, without needing to change the sign or magnitude of the GVD. Instead, by tuning the group velocity of a space–time wave packet (STWP) across a threshold value that we call the “escape velocity,” we observe an abrupt transition in the STWP from an O-shaped to an X-shaped spatiotemporal profile. This transition is associated with an abrupt change in the associated spatiotemporal spectrum of the STWP: from closed elliptical spatiotemporal spectra below the escape velocity to open hyperbolic spectra above it. These results may furnish new opportunities for engineering the phase-matching conditions in nonlinear and quantum optics.

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Abrupt X-to-O-wave structural field transition in presence of anomalous dispersion

Hall,

Abouraddy

2024

APL Photonics

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Synthesis and characterization of space-time light sheets: a tutorial

Romer,

Hall,

Abouraddy

2024

J. Opt.

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Space-time wave packets (STWPs) are a new class of pulsed optical beams with many unique and intriguing attributes, including propagation invariance and tunable group velocity in linear optical media. STWPs are a form of spatiotemporally structured light, so their synthesis poses challenges that are not shared by conventional monochromatic structured light fields. We present here a detailed description of the synthesis of STWPs that are localized along one transverse dimension and uniform along the other; i.e., space-time light sheets. We also describe the main characterization schemes needed for benchmarking the unique properties of space-time light sheets.

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Elusive phase wave caught

Cited by 2 publications

References 8 publications

Abrupt X-to-O-wave structural field transition in presence of anomalous dispersion

Abrupt X-to-O-wave structural field transition in presence of anomalous dispersion

Synthesis and characterization of space-time light sheets: a tutorial

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