Sparkling spots and random diffraction

Oliver, Bernard M.

doi:10.1109/proc.1963.1686

Cited by 125 publications

(27 citation statements)

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“…This irregular pattern is best described by methods of probability theory and statistics. The physical origin of the observed granularity, now know as "laser speckle", was quickly recognized by early workers in the field [3,4].…”

Section: Introductionmentioning

confidence: 99%

Disordered Field Patterns in a Waveguide With Periodic Surfaces

Pérez-Aguilar¹,

Mendoza-Suárez²,

Tututi³

et al. 2013

PIER B

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Abstract-This paper considers an electromagnetic waveguide composed of two periodic, perfectly conducting, rippled surfaces. This periodic system has a band structure given by a dispersion relation that allows us characterize eigenmodes of the system. We considered the cases of both smooth and rough surfaces, using an integral numerical method to calculate field intensities corresponding to eigenmodes over a wide frequency range. Under certain conditions, the system presents disordered patterns of field intensities with smooth surfaces. We believe that the explanation of disordered patterns is the following: for smooth surfaces, the phenomenon of electromagnetic chaos; and for rough surfaces, the speckle phenomenon. Since it is well known that the surfaces of materials always have a certain degree of roughness, it can be concluded that both chaos and speckle contribute to the presence of disordered field patterns.

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Section: Introductionmentioning

confidence: 99%

Disordered Field Patterns in a Waveguide With Periodic Surfaces

Pérez-Aguilar¹,

Mendoza-Suárez²,

Tututi³

et al. 2013

PIER B

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“…The exact appearance of the pattern is a function of distance from the observer to the scattering surface and relative motion between the observer and the scattering surface. These effects have been described by Oliver (1963) and by Rigden & Gordon (1962) who attribute them to a random but stationary defraction pattern. The bright spots in the pattern appear in front of the scattering surface.…”

mentioning

confidence: 74%

“…As they are caused by properties of the scattered light and not the viewing system, they always appear in focus. Printed information on the scattering surface behind the spots is defocused and tends to disappear (Oliver, 1963). The research reported here was designed to assess the effects of this phenomenon on brightness discrimination.…”

mentioning

confidence: 99%

Brightness discrimination in reflected laser light

1969

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“…The observer viewed a circular patch, sub tending at the eye 40 min of arc. The speckled nature of this patch is well known [5,10] and well understood from the physical stand point. Now, when the eye is at focus on the disc, the speckle pattern appears steady, if abstraction is made from a sort of brownianlike motion labelled 'boiling'.…”

Section: Apparatus and Methodsmentioning

confidence: 98%

Methods Currently Adopted for Testing Sight

Ronchi¹,

Fontana²

1975

Ophthalmic Res

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The measurements of eye refraction, obtained with the aid of two conventional techniques, such as vision test charts and Badal’s optometer, are known to agree with the data obtained with the recent laser refractors, the accuracy being of one quarter of a diopter. The present paper aims at comparing the principles on which the above said three techniques are based. The main difference seems to lie in the fact that the apparent movement of the laser speckles, denoting a situation of defocus, does not stimulate the accommodation reflex as the sensation of blur does.

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Sparkling spots and random diffraction

Cited by 125 publications

References 0 publications

Disordered Field Patterns in a Waveguide With Periodic Surfaces

Disordered Field Patterns in a Waveguide With Periodic Surfaces

Brightness discrimination in reflected laser light

Methods Currently Adopted for Testing Sight

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