Abstract:
:Fresnel lenses allow almost perfect imaging in widely different circumstances, but their focus is perfect only for a single wavelength. Wang et al. have shown how the effective bandpass may be widened for X-ray microscopy by using a compound diffractive/refractive lens near to an absorption edge. A compound lens has also been proposed for high-energy astronomy, working well above all absorption edges. Although the scale is very different, we point out here that the principle is the same. Ever since Galileo constructed an astronomical telescope that he was able to reconfigure to study fleas and gnats, astronomy and microscopy have relied on optics that are closely related, but different in detail.
journal_name
Naturejournal_title
Natureauthors
Skinner G,Gorenstein Pdoi
10.1038/426245bkeywords:
subject
Has Abstractpub_date
2003-11-20 00:00:00pages
245-6issue
6964eissn
0028-0836issn
1476-4687pii
426245bjournal_volume
426pub_type
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