Journal ArticleDOI
Very efficient speckle contrast reduction realized by moving diffuser device
Shigeo Kubota,Joseph W. Goodman +1 more
TLDR
Very efficient speckle contrast reduction is measured by temporal averaging using a moving diffuser on a tuning fork, which vibrates at 100 Hz over 60 microm in amplitude, a distance that is three times the surface roughness correlation length of the diffuser.Abstract:
Speckle noise reduction is best tested on a precise speckle contrast measurement bench, which should be able to measure 100% contrast in fully developed speckle as well as the smallest contrast (for example, less than 10%) after its reduction. On such a test bench, we have measured very efficient speckle contrast reduction by temporal averaging using a moving diffuser on a tuning fork, which vibrates at 100Hz over 60μm in amplitude, a distance that is three times the surface roughness correlation length of the diffuser.read more
Citations
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Proceedings ArticleDOI
Supercontinuum laser illumination for NIR reflectance spectroscopy of minerals and speckle reduction
TL;DR: In this article, a method to reduce speckle originating from the intrinsic coherence of a supercontinuum laser used for reflectance spectroscopy is proposed, which can reveal the characteristic spectra of two minerals.
Journal ArticleDOI
Fabrication of ultrathin flexible diffractive optical elements (DOEs) and application for laser speckle suppression
TL;DR: In this article , a technique for producing self-made ultrathin flexible diffractive optical elements (DOEs) with reciprocating movement that are effective in suppression of laser speckle was introduced.
Journal ArticleDOI
Laser speckle reduction using motionless image conduits
TL;DR: In this paper, a speckle reduction method using motionless image conduits (MICs) was demonstrated, and different experimental conditions by introducing the high-coherence HeNe laser and the low-coherent laser diode (LD) as the illumination light sources, by employing the straight MIC and the curved MIC as the SP components, and by recording images without (objective) and with (subjective) the imaging lens mounted on the CCD camera are conducted, respectively.
Journal ArticleDOI
Noise reduction in high-resolution speckle displacement measurements through ensemble averaging.
TL;DR: In this paper, a non-invasive method with both a low displacement measurement uncertainty below 100 nm and high spatial resolution of around 20 µm is presented to measure surface displacement on micro samples.
Journal ArticleDOI
Quantification of the effects of time-varying speckle patterns on speckle images using a modified speckle influence degree method
TL;DR: In this article, a measurement system that emulates the human eyes was used to generate time-varying speckle patterns at different velocities, whereby the correlation degree between the patterns, the correlation time, and SID was calculated as a function of velocity.
References
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Journal ArticleDOI
Introduction to Fourier Optics
Joseph W. Goodman,Mary E. Cox +1 more
TL;DR: The second edition of this respected text considerably expands the original and reflects the tremendous advances made in the discipline since 1968 as discussed by the authors, with a special emphasis on applications to diffraction, imaging, optical data processing, and holography.
Book
Introduction to Fourier optics
TL;DR: The second edition of this respected text considerably expands the original and reflects the tremendous advances made in the discipline since 1968 as discussed by the authors, with a special emphasis on applications to diffraction, imaging, optical data processing, and holography.
Journal ArticleDOI
Relation between the angular dependence of scattering and the statistical properties of optical surfaces
J. M. Elson,J. M. Bennett +1 more
TL;DR: In this paper, a relation from vector scattering theory has been used to predict the angular distribution of scattered light from optical surfaces as a function of the wavelength, optical constants of the material, and spectral density function.