| 21. |
High efficiency diffractive lenses: Deduction of kinoform profile |
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American Journal of Physics,
Volume 65,
Issue 6,
1997,
Page 556-562
Vicente Moreno,
Juan Félix Román,
José Ramón Salgueiro,
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摘要:
The zone plates (diffractive lenses) are not commonly used as image formation systems owing to their low efficiency and multifocal characteristics. In this paper we make a revision of the Fresnel zone plate principles, and present various kinds of zone plates designed to solve the problem of obtaining a limited number of foci with higher efficiency. The purpose of this work was to design, by using Fermat’s principle, a zone-plate profile with high focusing efficiency in only one or two foci, while maintaining a low efficiency in the others. Applying Fermat’s principle to this task results in the kinoform profile of the plate. Calculation of the kinoform profile efficiency reveals that it is the best possible solution to this problem.
ISSN:0002-9505
DOI:10.1119/1.18587
出版商:American Association of Physics Teachers
年代:1997
数据来源: AIP
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| 22. |
Phase space integration method for bound states |
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American Journal of Physics,
Volume 65,
Issue 6,
1997,
Page 563-564
Sharada Nagabhushana,
B. A. Kagali,
Sivramkrishna Vijay,
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摘要:
We present here an alternate method that may be called thephase space integration methodfor finding energies of bound states. This new method is applied to anharmonic oscillators, square well potentials, and logarithmic potentials. The numerical values are found to agree very well with those from other elaborate calculations.
ISSN:0002-9505
DOI:10.1119/1.18588
出版商:American Association of Physics Teachers
年代:1997
数据来源: AIP
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| 23. |
Spreadsheet solutions for Ampere’s law problems with irregularly shaped conductors |
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American Journal of Physics,
Volume 65,
Issue 6,
1997,
Page 565-567
Francis X. Hart,
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ISSN:0002-9505
DOI:10.1119/1.18593
出版商:American Association of Physics Teachers
年代:1997
数据来源: AIP
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| 24. |
Spontaneous symmetry breaking in a Cavendish experiment |
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American Journal of Physics,
Volume 65,
Issue 6,
1997,
Page 567-568
Jean Sivardière,
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ISSN:0002-9505
DOI:10.1119/1.18589
出版商:American Association of Physics Teachers
年代:1997
数据来源: AIP
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| 25. |
Comment on “Electromagnetism in Euclidean four space: A discussion between God and the Devil,” by José A. Heras [Am. J. Phys.62(10), 914–916 (1994)] |
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American Journal of Physics,
Volume 65,
Issue 6,
1997,
Page 569-569
Donald H. Kobe,
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ISSN:0002-9505
DOI:10.1119/1.18590
出版商:American Association of Physics Teachers
年代:1997
数据来源: AIP
|
| 26. |
Bose–Einstein condensation |
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American Journal of Physics,
Volume 65,
Issue 6,
1997,
Page 570-574
Isaac F. Silvera,
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ISSN:0002-9505
DOI:10.1119/1.18591
出版商:American Association of Physics Teachers
年代:1997
数据来源: AIP
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| 27. |
Mechanical amplifiers for gravitational wave detectors |
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American Journal of Physics,
Volume 65,
Issue 6,
1997,
Page 574-578
Mark F. Bocko,
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ISSN:0002-9505
DOI:10.1119/1.18592
出版商:American Association of Physics Teachers
年代:1997
数据来源: AIP
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| 28. |
How Nature Works: The Science of Self-Organized Criticality |
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American Journal of Physics,
Volume 65,
Issue 6,
1997,
Page 579-580
Per Bak,
Michael Weissman,
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ISSN:0002-9505
DOI:10.1119/1.18610
出版商:American Association of Physics Teachers
年代:1997
数据来源: AIP
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| 29. |
Gravity’s Fatal Attraction: Black Holes in the Universe |
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American Journal of Physics,
Volume 65,
Issue 6,
1997,
Page 580-581
Mitchell Begelman,
Martin Rees,
J. Craig Wheeler,
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PDF (247KB)
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ISSN:0002-9505
DOI:10.1119/1.18608
出版商:American Association of Physics Teachers
年代:1997
数据来源: AIP
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| 30. |
In Search of the Ultimate Building Blocks |
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American Journal of Physics,
Volume 65,
Issue 6,
1997,
Page 581-581
Gerard 't Hooft,
Frank Close,
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PDF (113KB)
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ISSN:0002-9505
DOI:10.1119/1.18609
出版商:American Association of Physics Teachers
年代:1997
数据来源: AIP
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