Journal
APPLIED PHYSICS LETTERS
Volume 84, Issue 19, Pages 3903-3905Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1739276
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We demonstrate experimentally that, in order to generate fully spatially coherent extreme-ultraviolet (EUV) beams using high-harmonic generation, it is necessary to guide the driving laser beam over long interaction lengths in gas-filled hollow waveguides. Numerical simulations show that, in propagating the laser through a long plasma-filled guide, the laser beam forms a stable eigenmode with uniform spatial phase, even at very high levels of ionization. This results in a compact, highly spatially coherent, EUV source useful for applications in EUV metrology, microscopy, interferometry, and holography. (C) 2004 American Institute of Physics.
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