Open AccessGeneration of hard X-rays using an ultrafast fiber laser system
Author(s) -
Kai-Hsiu Liao,
Aghapi Mordovanakis,
Bixue Hou,
Guoqing Chang,
Matthew Rever,
G. Mourou,
J. Nees,
Almantas Galvanauskas
Publication year - 2007
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.013942
Subject(s) - optics , materials science , femtosecond , laser , fiber laser , fiber , wavefront , physics , composite material
We report the first hard X-ray source driven by a femtosecond fiber laser. The high energy fiber CPA system incorporated a 65mum LMA fiber amplifying stage which provided 300-fs recompressed pulses and diffraction limited beam quality with M(2) < 1.07. A deformable mirror was used to optimize the wavefront and the spot size was focused down to 2.3 mum with an f/1.2 paraboloidal mirror. 50muJ was deposited on the nickel target with 2x10(15)-W/cm(2) focal intensity and a distinctive Ni K(alpha)-line (7.48 keV) emission was measured with 5x10(-8) energy conversion efficiency.