| 1 | The results provide a theoretical foundation for the applying of zone plates. | |
| 2 | This paper studies the focusing characteristics of Gauss beam passing through zone plate based on the characteristics of zone plate. | |
| 3 | The results indicate that the continuous phase type zone plate can focus Gaussian beam with high diffraction efficiency. | |
| 4 | The property of light spot of zone plate in misfocusing conditions is considered. | |
| 5 | A modified fractal zone plate (FZP) with the character of extending the focal depth is proposed. |
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