Optical Review
Print ISSN : 1340-6000
ISSN-L : 1340-6000
Mitigation of Diffraction Fringe in Quasi-Far Field Pattern Using an Edge-Shaped Plate
Noriaki NISHITakahisa JITSUNOMasahiro NAKATSUKA
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1998 年 5 巻 1 号 p. 39-42

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A new concept is developed for improving the laser intensity distribution in quasi-far field using geometrical optics of a continuous phase (so-called edge-shaped plate). The diffraction fringe on a quasi-far field beam pattern of a well collimated He-Ne laser beam 5 cm in diameter is mitigated by the insertion of an edge-shaped plate with a super-Gaussian (n=40) surface profile. A diffraction code using Fresnel-Kirchhoff diffraction integration was developed to calculate diffraction patterns of aspherical optical elements. The measured beam profile is in good agreement with the calculated beam pattern.
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© 1998 by the Optical Society of Japan
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