TY - JOUR
T1 - Coherence properties of high-order harmonics
T2 - Application to high-density laser-plasma diagnostic
AU - Merdji, H.
AU - Salières, P.
AU - Le Déroff, L.
AU - Hergott, J. F.
AU - Carré, B.
AU - Joyeux, D.
AU - Descamps, D.
AU - Norin, J.
AU - Lyng, C.
AU - L'Huillier, A.
AU - Wahlström, C. G.
AU - Bellini, M.
AU - Huller, S.
PY - 2000/12/1
Y1 - 2000/12/1
N2 - 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.
AB - 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.
U2 - 10.1017/S026303460018320X
DO - 10.1017/S026303460018320X
M3 - Article
AN - SCOPUS:0034441910
SN - 0263-0346
VL - 18
SP - 495
EP - 502
JO - Laser and Particle Beams
JF - Laser and Particle Beams
IS - 3
ER -