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Title: Diffraction patterns of the beam splitters used in a soft-x-ray interferometer with He-Ne laser

Two 50% reflection-50% transmission-grating beam splitter (B.S.) are being used in the soft x-ray interferometry at Beamline 9.3.2 of ALS. They are consisted of a rigid flat mirror with a series of slots width of 50 {mu}m etched in part (5{times}18 mm{sup 2}) of the area. The diffraction patterns of the first B.S. and both B.S.s were investigated with He-Ne laser in both cases of normal incident and 20{degrees} grazing incident to the B.S. The intensities of each diffraction pattern were measured with a radiation power meter (ORIEL 70260, 70261). The normal incident pattern is straight line and shows nearly same intervals, and the intensities of them are similar to that of the double slits with Fraunhofer diffraction theory. The diffraction patterns of grazing incident shows a circle spot line. The transmitted patterns and reflected patterns show a symmetric arc on a long distance screen, whose radii are same and confirm a modified diffraction equation. The intensities of all the fringes of the B.S. also follows to the Fraunhofer diffraction theory. Patterns of the grating were affected strongly by the single slit effect. It was observed that only 3 fringes of each pattern were illuminated on the 2nd beam splitter.more » For the soft x-ray ({lambda}=10 nm), the number of fringes illuminating on the 2nd B.S. was calculated from the results of He-Ne laser beam ({lambda}=632.8 nm) experiment, and showed x=0.0314 nm(fringe interval), n={+-}95.5(number of order) and therefore the total number was 191 fringes. The patterns produced by the 2nd beam splitter were also investigated in intensities and positions of them. Both patterns of upper beam and lower beam are the same direction and same radii of circle. It was found that each fringe consisted of fine fringes which as caused by two fringe beams arrived at the 2nd beam splitter.« less
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [4] ;  [4] ;  [4]
  1. Kyungpook National Univ., Taegu (Korea, Republic of); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  2. Kyungpook National Univ., Taegu (Korea, Republic of);
  3. Kyungpook National Univ., Taegu (Korea, Republic of)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Publication Date:
OSTI Identifier:
603643
Report Number(s):
LBNL--39981
ON: DE97007345; TRN: 98:009594
DOE Contract Number:
AC03-76SF00098
Resource Type:
Technical Report
Resource Relation:
Related Information: Is Part Of: Advanced light source: Compendium of user abstracts 1993--1996, 622 p.
Research Org:
Lawrence Berkeley Lab., CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; 43 PARTICLE ACCELERATORS; SOFT X RADIATION; INTERFEROMETERS; BEAM SPLITTING; DIFFRACTION