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- P Sprangle, A Ting, J Peñano, R Fischer, B Hafizi
- 2008

High-power fiber lasers can be incoherently combined to form the basis of a high-energy laser system for directedenergy applications. These applications include tactical directed energy and power beaming. Incoherent combining of fiber lasers has a number of advantages over other laser beam combining methods. The incoherently combined laser system is… (More)

- P Sprangle, J R Peñano, B Hafizi
- Physical review. E, Statistical, nonlinear, and…
- 2002

The propagation of short, intense laser pulses in the atmosphere is investigated theoretically and numerically. A set of three-dimensional (3D), nonlinear propagation equations is derived, which includes the effects of dispersion, nonlinear self-focusing, stimulated molecular Raman scattering, multiphoton and tunneling ionization, energy depletion due to… (More)

- J R Peñano, P Sprangle, B Hafizi, W Manheimer, A Zigler
- Physical review. E, Statistical, nonlinear, and…
- 2005

The interaction of intense, femtosecond laser pulses with a dielectric medium is examined using a numerical simulation. The simulation uses the one-dimensional electromagnetic wave equation to model laser pulse propagation. In addition, it includes multiphoton ionization, electron attachment, Ohmic heating of free electrons, and temperature-dependent… (More)

- J R Peñano, P Sprangle, P Serafim, B Hafizi, A Ting
- Physical review. E, Statistical, nonlinear, and…
- 2003

Stimulated rotational Raman scattering (SRRS) is known to be one of the processes limiting the propagation of high-power laser beams in the atmosphere. In this paper, SRRS, Kerr nonlinearity effects, and group velocity dispersion of short laser pulses and pulse trains are analyzed and simulated. Fully time-dependent, three-dimensional, nonlinear propagation… (More)

- I Alexeev, A C Ting, D F Gordon, E Briscoe, B Hafizi, P Sprangle
- Optics letters
- 2005

We perform laboratory experiments to study ultraviolet radiation generated by intense self-formed laser filaments produced by propagating high-power femtosecond laser pulses in air. The laser used in the experiment is a 0.5 TW Ti:sapphire system with the center wavelength at 800 nm. The observed ultraviolet emission occurs in the form of the third harmonic… (More)

- P Sprangle, J R Peñano, B Hafizi, C A Kapetanakos
- Physical review. E, Statistical, nonlinear, and…
- 2004

Intense, ultrashort laser pulses propagating in the atmosphere have been observed to emit sub-THz electromagnetic pulses (EMPS). The purpose of this paper is to analyze EMP generation from the interaction of ultrashort laser pulses with air and with dielectric surfaces and to determine the efficiency of conversion of laser energy to EMP energy. In our… (More)

- D. F. Gordon, B. Hafizi
- J. Comput. Physics
- 2012

Article history: Received 26 September 2011 Received in revised form 20 April 2012 Accepted 13 May 2012 Available online 26 May 2012

- P Sprangle, B Hafizi, +7 authors T M Antonsen
- Physical review. E, Statistical, nonlinear, and…
- 2001

To achieve multi-GeV electron energies in the laser wakefield accelerator (LWFA), it is necessary to propagate an intense laser pulse long distances in a plasma without disruption. One of the purposes of this paper is to evaluate the stability properties of intense laser pulses propagating extended distances (many tens of Rayleigh ranges) in plasma… (More)

Public reporting burden for this collection of information is estimated to average 1 hour per response, incluling the time for reviewing instructions, searching existing data sources, gatheuing and maintaining the data needed, and completing and reviewing this collection of Information. Send comments regarding this burden estimate or any other aspect of… (More)

- D. F. Gordon, B. Hafizi, A. S. Landsman
- J. Comput. Physics
- 2015