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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Vol. 20, Iss. 1 — Jan. 1, 2003
  • pp: 171–181

Application of frequency-domain interferometry in the extreme-ultraviolet range by use of high-order harmonics

Jean-Francois Hergott, Thierry Auguste, Pascal Salières, Laurent Le Déroff, Pascal Monot, Pascal d'Oliveira, David Campo, Hamed Merdji, and Bertrand Carré  »View Author Affiliations

JOSA B, Vol. 20, Issue 1, pp. 171-181 (2003)

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We apply the frequency-domain interferometry technique in the extreme-ultraviolet (XUV) range using high-order harmonics. The technique is first used to study the influence of ionization of the generating gas on the harmonic emission. We report a thorough study of the fringe contrast as a function of the generating parameters: gas pressure, laser intensity and focus position, harmonic order, delay, and relative intensity of the two laser pulses. We show that two phase-locked time-delayed harmonic pulses can be produced under optimal conditions. However, a strong distortion of the fringe pattern (low contrast and large asymmetry) can be induced by the deleterious effects of the medium ionization, i.e., depletion of the emitters, laser defocusing, and loss of mutual coherence that is due to free-electron dispersion. XUV frequency-domain interferometry is then applied to the measurement of the electron density of a plasma created by optical field-induced ionization of a high-pressure helium jet by use of an intense short-pulse laser. The measured temporal evolution of the electron density shows that the resolution of our experimental setup was of the order of 200 fs, which, to our knowledge, provides the first XUV interferometry measurement on a femtosecond time scale.

© 2003 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(190.0190) Nonlinear optics : Nonlinear optics
(190.4160) Nonlinear optics : Multiharmonic generation
(260.7200) Physical optics : Ultraviolet, extreme
(350.5400) Other areas of optics : Plasmas

Jean-Francois Hergott, Thierry Auguste, Pascal Salières, Laurent Le Déroff, Pascal Monot, Pascal d'Oliveira, David Campo, Hamed Merdji, and Bertrand Carré, "Application of frequency-domain interferometry in the extreme-ultraviolet range by use of high-order harmonics," J. Opt. Soc. Am. B 20, 171-181 (2003)

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