Tests of Submicron Structure X-ray Transmission Gratings PDF Download
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Author: Ramanujam Manikkalingam
Publisher:
ISBN:
Category :
Languages : en
Pages : 86
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Author: Ramanujam Manikkalingam
Publisher:
ISBN:
Category :
Languages : en
Pages : 86
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Author: Massachusetts Institute of Technology. Research Laboratory of Electronics
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Category : Electronics
Languages : en
Pages : 454
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Author:
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Category :
Languages : en
Pages :
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Gold transmission diffraction gratings used for x-ray spectroscopy must sometimes be rotationally aligned to the axis of a diagnostic instrument to within sub-milliradian accuracy. We have fabricated transmission diffraction gratings with high line-densities (grating period of 200 and 300 nm) using uv holographic and x-ray lithography. Since the submicron features of the gratings are not optically visible, precision alignment is time consuming and difficult to verify in situ. We have developed a technique to write an optically visible alignment pattern onto these gratings using a scanning electron microscope (SEM). At high magnification (15000 X) several submicron lines of the grating are observable in the SEM, making it possible to write an alignment pattern parallel to the grating lines in an electron-beam-sensitive coating that overlays the grating. We create an alignment pattern by following a 1-cm-long grating line using the SEM's joystick-controlled translation stage. By following the same grating line we are assured the traveled direction of the SEM electron beam is parallel to the grating to better than 10 .mu.radian. The electron-beam-exposed line-width can be large (5 to 15 .mu.m wide) depending on the SEM magnification, and is therefore optically visible. The exposed pattern is eventually made a permanent feature of the grating by ion beam etching or gold electroplating. The pattern can be used to accurately align the grating to the axis of a diagnostic instrument. More importantly, the alignment of the grating can be quickly verified in situ.
Author:
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ISBN:
Category : Materials
Languages : en
Pages : 922
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Author: Massachusetts Institute of Technology
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Category : Materials
Languages : en
Pages : 474
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Author:
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Category : Delegated legislation
Languages : en
Pages : 304
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Author: J. Leonard Culhane
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Category : Science
Languages : en
Pages : 430
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 614
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Author: Andrew Michael Hawryluk
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Category : Diffraction gratings
Languages : en
Pages : 162
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 392
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