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Compact x-ray microscope for the water window based on a high brightness laser plasma source

 
: Legall, H.; Blobel, G.; Stiel, H.; Sandner, W.; Seim, C.; Takman, P.; Martz, D.H.; Selin, M.; Vogt, U.; Hertz, H.M.; Esser, D.; Sipma, H.; Luttmann, J.; Höfer, M.; Hoffmann, H.D.; Yulin, S.; Feigl, T.; Rehbein, S.; Guttmann, P.; Schneider, G.; Wiesemann, U.; Wirtz, M.; Diete, W.

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Postprint (2.8 MByte; PDF; )

Optics Express 20 (2012), Nr.16, S.18362-18369
ISSN: 1094-4087
Englisch
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IOF ()
Fraunhofer ILT ()

Abstract
We present a laser plasma based x-ray microscope for the water window employing a high-average power laser system for plasma generation. At 90 W laser power a brightness of 7.4 × 10(exp 11) photons/(s x sr × µm2) was measured for the nitrogen Ly alpha line emission at 2.478 nm. Using a multilayer condenser mirror with 0.3 % reflectivity 10(exp 6) photons/(µm2 × s) were obtained in the object plane. Microscopy performed at a laser power of 60 W resolves 40 nm lines with an exposure time of 60 s. The exposure time can be further reduced to 20 s by the use of new multilayer condenser optics and operating the laser at its full power of 130 W.

: http://publica.fraunhofer.de/dokumente/N-212500.html