301 citations · 1k across the 13 of their papers we have counts for
13 papers
Spatiotemporal torquing of light
S. W. Hancock, S. Zahedpour, A. Goffin +1
We demonstrate the controlled spatiotemporal transfer of transverse orbital angular momentum (OAM) to electromagnetic waves: the spatiotemporal torquing of light. This is a radical…
Roadmap on structured waves
K. Y. Bliokh, E. Karimi, M. J. Padgett +47
Structured waves are ubiquitous for all areas of wave physics, both classical and quantum, where the wavefields are inhomogeneous and cannot be approximated by a single plane wave.…
Mode structure and orbital angular momentum of spatiotemporal optical vortex (STOV) pulses
S. W. Hancock, S. Zahedpour, H. M. Milchberg
We identify a class of modal solutions for spatio-temporal optical vortex (STOV) electromagnetic pulses propagating in dispersive media with orbital angular momentum (OAM) orthogon…
Transient-grating single-shot supercontinuum spectral interferometry (TG-SSSI)
S. W. Hancock, S. Zahedpour, H. M. Milchberg
We present a technique for the single-shot measurement of the space- and time-resolved spatiotemporal amplitude and phase of an ultrashort laser pulse. The method, transient-gratin…
Free-space propagation of spatio-temporal optical vortices (STOVs)
S. W. Hancock, S. Zahedpour, A. Goffin +1
Spatio-temporal optical vortices (STOVs) are a new type of optical orbital angular momentum (OAM) with optical phase circulation in space-time. In prior work [N. Jhajj et al., Phys…
Ultrashort infrared 2.5-11μm pulses: spatiotemporal profiles and absolute nonlinear response of air constituents
S. Zahedpour, S. W. Hancock, H. M. Milchberg
We measure the detailed spatiotemporal profiles of femtosecond laser pulses in the infrared wavelength range λ=2.5-11μm, and the absolute nonlinear response of major air constituen…
Bound electron nonlinearity beyond the ionization threshold
J. K. Wahlstrand, S. Zahedpour, A. Bahl +2
Although high field laser-induced ionization is a fundamental process underlying many applications, there have been no absolute measurements of the nonlinear polarizability of atom…
Spatio-temporal optical vortices
N. Jhajj, I. Larkin, E. W. Rosenthal +3
We present the first experimental evidence, supported by theory and simulation, of spatiotemporal optical vortices (STOVs). Quantized STOVs are a fundamental element of the nonline…
Absolute measurement of the ultrafast nonlinear electronic and rovibrational response in H and D
J. K. Wahlstrand, S. Zahedpour, Y. -H. Cheng +2
The electronic, rotational, and vibrational components of the ultrafast optical nonlinearity in H and D are measured directly and absolutely at intensities up to the ioniza…
Sensitivity of propagation and energy deposition in femtosecond filamentation to the nonlinear refractive index
E. W. Rosenthal, J. P. Palastro, N. Jhajj +3
The axial dependence of femtosecond filamentation in air is measured under conditions of varying laser pulsewidth, energy, and focusing f-number. Filaments are characterized by the…
Quantum Control of Molecular Gas Hydrodynamics
Sina Zahedpour, Jared Wahlstrand, Howard Milchberg
We demonstrate that strong impulsive gas heating or heating suppression at standard temperature and pressure can occur from coherent rotational excitation or de-excitation of molec…
Direct measurement of the acoustic waves generated by femtosecond filaments in air
J. K. Wahlstrand, N. Jhajj, E. W. Rosenthal +2
We present direct measurements of the gas acoustic dynamics following interaction of spatial single- and multi-mode 50 fs, 800 nm pulses in air at 10 Hz and 1 kHz repetition rates.…
p-Norm Flow Optimization in a Network
Sina Zahedpour, Mehdi Kalantari
In this paper we study information flow paths in a data network, where traffic generated by servers (or sources) takes a multi-hop path in order to reach its clients (destinations)…