Wave-front phase measurements of high-order harmonic beams by use of point-diffraction interferometry.
We report the wave-front phase measurement of high-order harmonics employing point-diffraction interferometry. The high-order harmonics generated in a gas-filled hollow tube showed excellent spatial coherence over nearly the whole cross section of the harmonic beams. Using this coherent harmonic source in the extreme-ultraviolet-soft-x-ray region, we have demonstrated the operation of a point-diffraction interferometer and measured the wave-front phase of high-order harmonics.
Lee
D G
DG
Department of Physics, Coherent X-Ray Research Center, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea. donggun@mail.kaist.ac.kr
Park
J J
JJ
Sung
J H
JH
Nam
C H
CH