2 March 2001 Coherent beam focusing by a two sequentially arranged aperture system
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Abstract
The new optical effect of a diffractive multifocal focussing of radiation, predicted by the theory, on a bicomponent diffraction system with small Fresnel numbers, consisting of two plane screens with circular apertures on a given optical axes, is confirmed experimentally. Is shown, that the diffraction picture in the focal planes of such system represents the circular nonlocal bands of the Fresnel zones with a bright narrow peak at the center, whose intensity in the experiment can exceed by six to ten times the value of the incident plane wave intensity. Experimentally is established, that the diffractive multifocal focusing of a radiation on a real screens with axial circular apertures, whose diameters exceed a radiation wavelength, is insensitive to the 'rough' external conditions: to a thickness of screens, to the irregularities of edges and non-ideal form of apertures, to a heterogeneity of initial distribution of an incident wave intensity, to changes in the medium of the wave propagation.
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Renat R. Letfullin, Renat R. Letfullin, Oleg A. Zayakin, Oleg A. Zayakin, } "Coherent beam focusing by a two sequentially arranged aperture system", Proc. SPIE 4353, Laser Optics 2000: Control of Laser Beam Characteristics and Nonlinear Methods for Wavefront Control, (2 March 2001); doi: 10.1117/12.417761; https://doi.org/10.1117/12.417761
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