7 research outputs found
Temporal laser pulse shape effects in nonlinear Thomson scattering
The influence of the laser pulse temporal shape on the Nonlinear Thomson
Scattering on-axis photon spectrum is analyzed in detail. Using the classical
description, analytical expressions for the temporal and spectral structure of
the scattered radiation are obtained for the case of symmetric laser pulse
shapes. The possibility of reconstructing the incident laser pulse from the
scattered spectrum averaged over interference fringes in the case of high peak
intensity and symmetric laser pulse shape is discussed.Comment: 18 pages, 8 figure
Optimizing Laser Pulses for Narrow-Band Inverse Compton Sources in the High-Intensity Regime
Scattering of ultraintense short laser pulses off relativistic electrons
allows one to generate a large number of X- or -ray photons with the
expense of the spectral width---temporal pulsing of the laser inevitable leads
to considerable spectral broadening. In this Letter, we describe a simple
method to generate optimized laser pulses that compensate the nonlinear
spectrum broadening, and can be thought of as a superposition of two oppositely
linearly chirped pulses delayed with respect to each other. We develop a simple
analytical model that allow us to predict the optimal parameters of such a
two-pulse---the delay, amount of chirp and relative phase---for generation of a
narrowband {\gamma}-ray spectrum. Our predictions are confirmed by numerical
optimization and simulations including 3D effects.Comment: 8 pages, 5 figure
Higher-Dimensional Caustics in Nonlinear Compton Scattering
A description of the spectral and angular distributions of Compton scattered light in collisions of intense laser pulses with high-energy electrons is unwieldy and usually requires numerical simulations. However, due to the large number of parameters affecting the spectra such numerical investigations can become computationally expensive. Using methods of catastrophe theory we predict higher-dimensional caustics in the spectra of the Compton scattered light, which are associated with bright narrow-band spectral lines, and in the simplest case can be controlled by the value of the linear chirp of the pulse. These findings require no full-scale calculations and have direct consequences for the photon yield enhancement of future nonlinear Compton scattering x-ray or gamma-ray sources
Analytical results for nonlinear Compton scattering in short intense laser pulses
We study in detail the strong-field QED process of non-linear Compton
scattering in short intense plane wave laser pulses of circular polarization.
Our main focus is placed on how the spectrum of the back-scattered laser light
depends on the shape and duration of the initial short intense pulse. Although
this pulse shape dependence is very complicated and highly non-linear, and has
never been addressed explicitly, our analysis reveals that all the dependence
on the laser pulse shape is contained in a class of three-parameter master
integrals. Here we present completely analytical expressions for the non-linear
Compton spectrum in terms of these master integrals. Moreover, we analyse the
universal behaviour of the shape of the spectrum for very high harmonic lines.Comment: 15 pages, 6 figure