Coherent soft x-rays in high resolution imaging
To illustrate the coherence problems in x-ray imaging we examine -scanning x-ray microscopy -holography, and soft x-ray diffraction as illustrating examples. We show that only x-rays from within the emittance xx'yy'<(2.44l)/sup 2/ have the necessary spatial coherence to yield diffraction-limited images. The degree of temporal coherence required depends on the nature of the imaging system, and the size of the specimen. In conventional x-ray systems, spatial coherence is generated by collimation, while temporal coherence is achieved with monochromators. In these systems, then, one filters out a minute coherent fraction of an intense incoherent beam. Aside from the inefficiency of the procedure, there is a practical limitation of the temporal coherence length of about 10/sup 3/lambda that one can generate this way in the soft x-ray regime.
- Research Organization:
- National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973
- OSTI ID:
- 5035420
- Journal Information:
- AIP Conf. Proc.; (United States), Vol. 118:1
- Country of Publication:
- United States
- Language:
- English
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