Imaging at low Fresnel number: some challenges and applications

2006 ◽  
Author(s):  
Marc Ferlet
Keyword(s):  
Fresnel Number

Study of Fraunhofer Diffraction Pattern from a Circular Aperture Using an Optical Fiber Microprobe

2011 ◽  
Vol 378-379 ◽  
pp. 565-568
Author(s):  
Wan Maisarah Mukhtar ◽  
P. Susthitha Menon ◽  
Sahbudin Shaari
Keyword(s):  
Optical Fiber ◽  
Diffraction Pattern ◽  
Light Propagation ◽  
Optical Power ◽  
Transverse Motion ◽  
Circular Aperture ◽  
Fraunhofer Diffraction ◽  
Fresnel Number ◽  
Function Profile ◽  
Effect Of Light

Fraunhofer diffraction pattern from a circular aperture with the diameter of 10µm was observed using an optical fiber microprobe. The optical fiber microprobe started to detect optical power when the distance between the probe and the circular aperture was more than 292µm. When the probe was moved in a lateral motion, the light propagation showed a Bessel function profile. When the optical fiber microprobe was moved from 293µm to 309µm from the centre of the circular aperture in a transverse motion, the power detected was not consistent with a continuation of maxima and minima due to the effect of light propagation from the circular aperture. We also observed that the distance between the probe and the centre of the circular aperture was directly proportional with the radius of focused spot and inversely proportional with the Fresnel number.

Phase retrieval from a single near-field diffraction pattern with a large Fresnel number

2008 ◽  
Vol 25 (11) ◽  
pp. 2651 ◽  
Author(s):  
Enrong Li ◽  
Yijin Liu ◽  
Xiaosong Liu ◽  
Kai Zhang ◽  
Zhili Wang ◽  
...  
Keyword(s):  
Diffraction Pattern ◽  
Phase Retrieval ◽  
Near Field ◽  
Fresnel Number

Effective Fresnel-number concept for evaluating the relative focal shift in focused beams

1998 ◽  
Vol 15 (2) ◽  
pp. 449 ◽  
Author(s):  
Manuel Martı́nez-Corral ◽  
Carlos J. Zapata-Rodrı́guez ◽  
Pedro Andrés ◽  
Enrique Silvestre
Keyword(s):  
Fresnel Number ◽  
Number Concept ◽  
Focal Shift ◽  
Focused Beams

Image profile upon passage through a Fabry-Perot interferometer of large Fresnel number

1979 ◽  
Vol 69 (2) ◽  
pp. 348 ◽  
Author(s):  
Abbas Riazi ◽  
D. A. Christensen ◽  
O. P. Gandhi
Keyword(s):  
Fresnel Number ◽  
Fabry Perot

Demonstration of 1e-10 contrast at the inner working angle of a starshade in broadband light and at a flight-like Fresnel number

2019 ◽  
Author(s):  
Anthony Harness ◽  
Stuart B. Shaklan ◽  
N. Jeremy Kasdin ◽  
Michael Galvin ◽  
Phillip A. Willems ◽  
...  
Keyword(s):  
Fresnel Number

scholarly journals Propagation of an Airy-Gaussian beam passing through a lens with low effective Fresnel number

2020 ◽  
Vol 16 ◽  
pp. 102854
Author(s):  
Jie Zhu ◽  
Huiqin Tang ◽  
Qilin Gao
Keyword(s):  
Gaussian Beam ◽  
Fresnel Number

Multimode Resonators with a Small Fresnel Number (Lowest-Order Eigenmodes)

1965 ◽  
Vol 20 (1) ◽  
pp. 38-48 ◽  
Author(s):  
Helmut K. V. Lotsch
Keyword(s):  
Imaginary Part ◽  
Traveling Wave ◽  
General Type ◽  
Wave Type ◽  
Fresnel Number ◽  
Fabry Perot ◽  
Diffracted Waves ◽  
Resonator System ◽  
The Waves ◽  
Confocal Resonator

The Fabry-Pèrot Interferometer, the confocal and the spherical resonator systems are investigated. The lowest-order traveling-wave type eigenmodes are calculated. Numerical values for the diffraction losses are given. The smallest diffraction losses are obtained for the general-type eigenmode of a confocal resonator system. The eigenfunctions of an open-walled resonator show a point of inflection as their characteristic feature. They are complex if the Fresnel Number is finite. When calculate over appropriate surfaces, their imaginary part, in the region close to the axis, decreases as F increases. In that region the waves resonate between the reflectors. Towards the rim of the system the imaginary part increases rapidly as do the diffracted waves associated with the imaginary part.

Effects of Fresnel number in focusing and imaging

1999 ◽  
Author(s):  
Colin J. R. Sheppard ◽  
Peter Torok
Keyword(s):  
Fresnel Number
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