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

Published online by Cambridge University Press:  09 April 2001

H. MERDJI ,
P. SALIÈRES ,
L. LE DÉROFF ,
J.-F. HERGOTT ,
B. CARRÉ ,
D. JOYEUX ,
D. DESCAMPS ,
J. NORIN ,
C. LYNGÅ  and
A. L'HUILLIER
...Show all authors
H. MERDJI
Affiliation:
Service des Photons, Atomes et Molécules, CEA-DSM-DRECAM, Centre de Saclay, 91191 Gif-sur-Yvette, France
P. SALIÈRES
Affiliation:
Service des Photons, Atomes et Molécules, CEA-DSM-DRECAM, Centre de Saclay, 91191 Gif-sur-Yvette, France
L. LE DÉROFF
Affiliation:
Service des Photons, Atomes et Molécules, CEA-DSM-DRECAM, Centre de Saclay, 91191 Gif-sur-Yvette, France
J.-F. HERGOTT
Affiliation:
Service des Photons, Atomes et Molécules, CEA-DSM-DRECAM, Centre de Saclay, 91191 Gif-sur-Yvette, France
B. CARRÉ
Affiliation:
Service des Photons, Atomes et Molécules, CEA-DSM-DRECAM, Centre de Saclay, 91191 Gif-sur-Yvette, France
D. JOYEUX
Affiliation:
Institut d'Optique Théorique et Appliquée 91403 Orsay, France
D. DESCAMPS
Affiliation:
Department of Physics, Lund Institute of Technology, P.O. Box 118, S-221 00 Lund, Sweden
J. NORIN
Affiliation:
Department of Physics, Lund Institute of Technology, P.O. Box 118, S-221 00 Lund, Sweden
C. LYNGÅ
Affiliation:
Department of Physics, Lund Institute of Technology, P.O. Box 118, S-221 00 Lund, Sweden
A. L'HUILLIER
Affiliation:
Department of Physics, Lund Institute of Technology, P.O. Box 118, S-221 00 Lund, Sweden
C.-G. WAHLSTRÖM
Affiliation:
Department of Physics, Lund Institute of Technology, P.O. Box 118, S-221 00 Lund, Sweden
M. BELLINI
Affiliation:
L.E.N.S., Largo E. Fermi, 2, I-50125 Florence, Italy
S. HULLER
Affiliation:
Centre de Physique Théorique, CNRS, Ecole Polytechnique, 91128 Palaiseau Cédex
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Abstract

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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 13th 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 2.1020 cm−3 are measured.

Type
ULIA-1 CONFERENCE PAPERS
Information
Laser and Particle Beams , Volume 18 , Issue 3 , July 2000 , pp. 495 - 502
Copyright
© 2000 Cambridge University Press