| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 9785622 | Optics Communications | 2005 | 7 Pages |
Abstract
The on-axis irradiance distribution of a truncated conical wavefront is evaluated in terms of the Fresnel number of the focusing geometry. In agreement with geometrical optics, a focal line of increasing intensity is generated for extremely high Fresnel numbers. Otherwise clear deviations may be observed for the position of the maximum irradiance along the optical axis. A remarkable focal squeeze appears and, for decreasing Fresnel numbers, this effect manifests stronger. An analytical formula is provided for the fast evaluation of the focal squeeze.
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Authors
Carlos J. Zapata-RodrÃguez, Florencio E. Hernández,