## Abstract A diffractive optical element having equal‐width concentric square rings is analyzed in this article. This constant width makes possible its realization using spatial light modulators or square pixels phase screens. It allows a simple analytical treatment, and the element is also simula
✦ LIBER ✦
Photographing Diffraction Rings—Optical Phenomenon
✍ Scribed by LE CONTE, JOHN
- Book ID
- 109403380
- Publisher
- Nature Publishing Group
- Year
- 1881
- Tongue
- English
- Weight
- 133 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0028-0836
- DOI
- 10.1038/024485d0
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To convert a given single-mode He±Ne laser beam into a ring-shaped intensity distribution, a diractive optical element with 16 levels was designed by YG amplitude-phase retrieval and iteration algorithm. This beam shaper is investigated experimentally and compared with the results of the computer de