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Radiometry and metrology of a phase zone plate measured by extreme ultraviolet synchrotron radiation

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Abstract

The diffraction efficiency, focal length, and other radiometric and metrology properties of a phase zone plate were measured by using monochromatic synchrotron radiation in the 7–18.5nm wavelength range. The zone plate was composed of molybdenum zones having a 4mm outer diameter and 70nm nominal thickness and supported on a 100nm thick silicon nitride membrane. The diffraction efficiency was enhanced by the phase shift of the radiation passing through the zones. The measured first-order efficiency was in good agreement with the calculated efficiency. The properties of the zone plate, particularly the small variation of the efficiency with off-axis angle, make it suitable for use in a radiometer to accurately measure the absolutely calibrated extreme ultraviolet emission from the Sun.

© 2009 Optical Society of America

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