Coherence properties of high-order harmonics: Application to high-density laser-plasma diagnostic

Research output: Contribution to journalArticle


We present two interferometry schemes in the extreme ultraviolet, based on either the wave-front division of a unique harmonic beam (1st scheme) or two spatially separated, phase-locked harmonic sources (2nd scheme). In the first scheme using a Fresnel bimirror interferometer, we measure the degree of spatial coherence of the 13 th harmonic generated in xenon, as a function of different parameters. A high degree of coherence, larger than 0.5, is found for the best conditions in almost the full section of the beam. Then, we demonstrate that the second scheme can be used for interferometry measurements with an ultrahigh time resolution. The 11th harmonic is used to study the spatial variation of the electron density of a laser-produced plasma. Electronic densities higher than 2.10 20 cm -3 are measured.


External organisations
  • Institut d'Optique Graduate School
  • European Laboratory for Non-Linear Spectroscopy (LENS)
  • The French National Centre for Scientific Research (CNRS)
  • IRAMIS: Saclay Institute of Matter and Radiation
  • Lund University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Atom and Molecular Physics and Optics
Original languageEnglish
Pages (from-to)495-502
Number of pages8
JournalLaser and Particle Beams
Issue number3
Publication statusPublished - 2000 Dec 1
Publication categoryResearch