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Simulation method for non-Gaussian speckle in a partially coherent system.

Dongyel Kang¹, Tom D Milster

¹College of Optical Sciences, University of Arizona, Tucson, Arizona 85721, USA. dkang@optics.arizona.edu

Journal of the Optical Society of America. A, Optics, Image Science, and Vision

|September 2, 2009

Summary

Simulations reveal non-Gaussian speckle contrast in partially coherent systems. Experimental verification using a fractal surface confirms the simulation

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Area of Science:

Optics and Photonics
Statistical Optics
Image Science

Background:

Speckle contrast in imaging systems is influenced by object properties and illumination coherence.
Understanding non-Gaussian speckle statistics is crucial for accurate image analysis and metrology.
Phase-perturbed random objects introduce complex scattering phenomena.

Purpose of the Study:

To simulate and experimentally verify non-Gaussian speckle contrast from phase-perturbed objects in partially coherent light.
To investigate the impact of spatial partial coherence on speckle statistics.
To validate a simulation method for speckle contrast analysis.

Main Methods:

A quasi-monochromatic extended incoherent source was modeled as a grid of point sources.
Speckle contrast was calculated by incoherently summing irradiances in the image plane.
Simulations were validated using experimental measurements on a fabricated fractal surface.

Main Results:

The simulation accurately reproduced experimental speckle contrast measurements.
Non-Gaussian speckle statistics were observed and quantified.
The spatial coherence of the source significantly affected speckle contrast.

Conclusions:

The developed simulation method is effective for analyzing speckle contrast in partially coherent systems.
Phase perturbations and spatial coherence are key factors determining speckle contrast.
The findings contribute to a better understanding of light scattering and speckle phenomena.