Picture of scraped petri dish

Scrape below the surface of Strathprints...

Explore world class Open Access research by researchers at the University of Strathclyde, a leading technological university.


Mode locking in a free-electron laser amplifier

Thompson, N R and McNeil, B W J (2008) Mode locking in a free-electron laser amplifier. Physical Review Letters, 100 (20). ISSN 0031-9007

PDF (ThompsonMcNeil-PRL2008-mode-locking)
PRL_MLSASE.pdf - Published Version

Download (1MB) | Preview


A technique is proposed to generate attosecond pulse trains of radiation from a free-electron laser amplifier. The optics-free technique synthesizes a comb of longitudinal modes by applying a series of spatiotemporal shifts between the copropagating radiation and electron bunch in the free-electron laser. The modes may be phase locked by modulating the electron beam energy at the mode spacing frequency. Three-dimensional simulations demonstrate the generation of a train of 400 as pulses at gigawatt power levels evenly spaced by 2.5 fs at a wavelength of 124 A. In the x-ray at wavelength 1.5 A, trains of 23 as pulses evenly spaced by 150 as and of peak power up to 6 GW are predicted.