Abstract

We report, for the first time to our knowledge, experimental demonstration of wave-front analysis via the Hartmann technique in the extreme ultraviolet range. The reference wave front needed to calibrate the sensor was generated by spatially filtering a focused undulator beam with 1.7- and 0.6µm-diameter pinholes. To fully characterize the sensor, accuracy and sensitivity measurements were performed. The incident beam’s wavelength was varied from 7 to 25 nm. Measurements of accuracy better than λEUV/120 (0.11 nm) were obtained at λEUV=13.4 nm. The aberrations introduced by an additional thin mirror, as well as wave front of the spatially unfiltered incident beam, were also measured.

© 2003 Optical Society of America

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