This article is cited in 4 papers

Nonlinear optical phenomena

Observation of diffraction multifocal radiation focusing

R. R. Letfullin, O. A. Zayakin

Samara Branch of P. N. Lebedev Physical Institute, Russian Academy of Sciences

Abstract: It is shown experimentally that by placing a flat screen with an axial hole in a diffraction field formed by the first open Fresnel zone upon diffraction of a plane electromagnetic wave from a parallel screen with a hole of a larger diameter, one can observe diffraction multifocal focusing of radiation in the near-field zone of the first screen. The diffraction pattern in the near-field zone of the first screen in focal planes represents circular nonlocalised Fresnel bands with a bright narrow peak at the centre, whose intensity is 6 – 10 greater than that of the incident wave.

PACS: 42.25.Fx

Received: 24.05.2000
Revised: 16.11.2000

 English version: Quantum Electronics, 2001, 31:4, 339–342

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