100 citations · 1.2k across the 72 of their papers we have counts for
25 papers · 1 filter
Flying focus with arbitrary directionality for spatiotemporal control of laser pulses
Sida Cao, Devdigvijay Singh, Lavonne S. Mack +2
Flying focus techniques produce laser pulses whose focal points travel at arbitrary, controllable velocities. While this flexibility can enhance a broad range of laser-based applic…
Photon acceleration of high-intensity vector vortex beams into the extreme ultraviolet
Kyle G. Miller, Jacob R. Pierce, Fei Li +4
Extreme ultraviolet (XUV) light sources allow for the probing of bound electron dynamics on attosecond scales, interrogation of high-energy-density matter, and access to novel regi…
Dephasingless two-color terahertz generation
Tanner T. Simpson, Jeremy J. Pigeon, Kyle G. Miller +3
A laser pulse composed of a fundamental and an appropriately phased second harmonic can drive a time-dependent current of photoionized electrons that generates broadband THz radiat…
Self-focused pulse propagation is mediated by spatiotemporal optical vortices
M. S. Le, G. A. Hine, A. Goffin +2
We show that the dynamics of high-intensity laser pulses undergoing self-focused propagation in a nonlinear medium can be understood in terms of the topological constraints imposed…
Programmable and arbitrary-trajectory ultrafast flying focus pulses
M. V. Ambat, J. L. Shaw, J. J. Pigeon +4
"Flying focus" techniques produce laser pulses with dynamic focal points that travels distances much greater than a Rayleigh length. The implementation of these techniques in laser…
Spatiotemporal control of two-color terahertz generation
Tanner T. Simpson, Jeremy J. Pigeon, Manfred Virgil Ambat +5
A laser pulse composed of a fundamental and properly phased second harmonic exhibits an asymmetric electric field that can drive a time-dependent current of photoionized electrons.…
Exact solutions for the electromagnetic fields of a flying focus
D. Ramsey, A. Di Piazza, M. Formanek +10
The intensity peak of a "flying focus" travels at a programmable velocity over many Rayleigh ranges while maintaining a near-constant profile. Assessing the extent to which these f…
Arbitrarily Structured Laser Pulses
Jacob R. Pierce, John P. Palastro, Fei Li +5
Spatiotemporal control refers to a class of optical techniques for structuring a laser pulse with coupled space-time dependent properties, including moving focal points, dynamic sp…
Spatiotemporal control of laser intensity through cross-phase modulation
Tanner T. Simpson, Dillon Ramsey, Phil Franke +5
Spatiotemporal pulse shaping provides control over the trajectory and range of an intensity peak. While this control can enhance laser-based applications, the optical configuration…
Optical Shock-Enhanced Self-Photon Acceleration
Philip Franke, Dillon Ramsey, Tanner T. Simpson +2
Photon accelerators can spectrally broaden laser pulses with high efficiency in moving electron density gradients. When driven by a conventional laser pulse, the group velocity wal…
Nonlinear spatiotemporal control of laser intensity
Tanner T. Simpson, Dillon Ramsey, Philip Franke +4
Spatiotemporal control over the intensity of a laser pulse has the potential to enable or revolutionize a wide range of laser-based applications that currently suffer from the poor…
Beating Optical Turbulence Limits Using High Peak-Power Lasers
Michael H. Helle, Gregory Dicomo, Samantha Gregory +6
We experimentally demonstrate the ability of a nonlinear self-channeling beam to resist turbulence-induced spreading and scintillation. Spatio-temporal data is presented for an 850…
Ionization waves of arbitrary velocity driven by a flying focus
J. P. Palastro, D. Turnbull, S. -W. Bahk +5
A chirped laser pulse focused by a chromatic lens exhibits a dynamic, or "flying," focus in which the trajectory of the peak intensity decouples from the group velocity. In a mediu…
Two-photon vibrational excitation of air by long-wave infrared laser pulses
J. P. Palastro, J. Penano, L. A. Johnson +3
Ultrashort long-wave infrared (LWIR) laser pulses can resonantly excite vibrations in N2 and O2 through a two-photon transition. The absorptive, vibrational component of the ultraf…
Reciprocity breaking during nonlinear propagation of adapted beams through random media
J. P. Palastro, J. Penano, W. Nelson +4
Adaptive optics (AO) systems rely on the principle of reciprocity, or symmetry with respect to the interchange of point sources and receivers. These systems use the light received…
Using an incoherent target-return to adaptively focus through atmospheric turbulence
William Nelson, John P. Palastro, Chensheng Wu +1
A laser beam propagating to a remote target through atmospheric turbulence acquires intensity fluctuations. If the target is cooperative and provides a coherent return beam, the ph…
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…
Dramatic enhancement of supercontinuum generation in elliptically-polarized laser filaments
Shermineh Rostami, Michael Chini, Khan Lim +6
Broadband laser sources based on supercontinuum generation by femtosecond laser filamentation have enabled applications from stand-off sensing and spectroscopy to the generation an…
Stimulated Raman Scattering and Nonlinear Focusing of High-Power Laser Beams Propagating in Water
B. Hafizi, J. P. Palastro, J. R. Penano +4
The physical processes associated with propagation of a high-power (power > critical power for self-focusing) laser beam in water include nonlinear focusing, stimulated Raman scatt…
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…
Enhanced backscatter of optical beams reflected in turbulent air
W. Nelson, J. P. Palastro, C. Wu +1
Optical beams propagating through air acquire phase distortions from turbulent fluctuations in the refractive index. While these distortions are usually deleterious to propagation,…
Propagation of Bessel and Airy beams through atmospheric turbulence
W. Nelson, J. P. Palastro, C. C. Davis +1
We investigate, through simulation, the modifications to Bessel and Airy beams during propagation through atmospheric turbulence. We find that atmospheric turbulence disrupts the q…
Time-dependent polarization states of high power, ultrashort laser pulses during atmospheric propagation
J. P. Palastro
We investigate, through simulation, the evolution of polarization states during atmospheric propagation of high power, ultrashort laser pulses. A delayed rotational response model…
THz generation by optical Cherenkov emission from ionizing two-color laser pulses
Luke A. Johnson, John P. Palastro, Thomas M. Antonsen +1
Two-color photoionization produces a cycle-averaged current driving broadband, conically emitted THz radiation. We investigate, through simulation, the processes determining the an…