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Title: Effect of initial phase on error in electron energy obtained using paraxial approximation for a focused laser pulse in vacuum

We have investigated the effect of initial phase on error in electron energy obtained using paraxial approximation to study electron acceleration by a focused laser pulse in vacuum using a three dimensional test-particle simulation code. The error is obtained by comparing the energy of the electron for paraxial approximation and seventh-order correction description of the fields of Gaussian laser. The paraxial approximation predicts wrong laser divergence and wrong electron escape time from the pulse which leads to prediction of higher energy. The error shows strong phase dependence for the electrons lying along the axis of the laser for linearly polarized laser pulse. The relative error may be significant for some specific values of initial phase even at moderate values of laser spot sizes. The error does not show initial phase dependence for a circularly laser pulse.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [2]
  1. Singh Simutech Pvt. Ltd., Bharatpur, Rajasthan 321201 (India)
  2. (India)
  3. Department of Physics, Shri Venkateshwara University, Gajraula, Amroha, Uttar Pradesh 244236 (India)
  4. Institute of Optics, University of Rochester, Rochester, New York 14627 (United States)
Publication Date:
OSTI Identifier:
22489469
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 10; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ACCELERATION; APPROXIMATIONS; CORRECTIONS; ELECTRONS; ERRORS; FORECASTING; LASERS; PULSES; SIMULATION; TEST PARTICLES