Phillip Sprangle

TL;DR: This paper proposes a related but simpler approach on the basis of the backward-directed lasing in optically excited dominant constituents of plain air, N2 and O2, based on the remote generation of a weakly ionized plasma channel through filamentation of an ultraintense femtosecond laser pulse.

TL;DR: In this paper, an inverse Cherenkov laser acceleration configuration is presented in which a laser beam is self-guided in a partially ionized gas, and the stability of self-guiding beams is analyzed and discussed.

TL;DR: In this paper, a general analysis of free electron lasers in which a static periodic magnetic pump field is scattered from a relativistic electron beam is presented, and scaling laws for the growth rates and efficiencies at a fixed radiation frequency as a function of the magnetic pump amplitude are obtained.

TL;DR: In this paper, the authors present results of the first field demonstration of incoherent beam combining using kilowatt-class, single-mode fiber lasers, at a range of 1.2 km, with transmitted continious-wave power levels of 3 kW.

TL;DR: The nonlinear interaction of ultraintense laser pulses with electron beams and plasmas is rich in a wide variety of new phenomena as discussed by the authors, including laser excitation of large-amplitude plasma waves (wake fields), relativistic optical guiding of laser pulses in preformed plasma channels, laser frequency amplification by ionization fronts and plasma waves, and stimulated backscattering from plasma and electron beams, and cooling of electron beams by intense lasers.