Results 51 to 60 of about 44,997 (341)
Contribution of speckle noise in near-infrared spectroscopy measurements [PDF]
, 2019 Near-infrared spectroscopy (NIRS) is widely used in biomedical optics with applications ranging from basic science, such as in functional neuroimaging, to clinical, as in pulse oximetry.
Boas, David A. +5 more
core +1 more source
Ocular microtremor laser speckle metrology [PDF]
SPIE Proceedings, 2009 Ocular Microtremor (OMT) is a continual, high frequency physiological tremor of the eye present in all subjects even when the eye is apparently at rest. OMT causes a peak to peak displacement of around 150nm-2500nm with a broadband frequency spectrum between 30Hz to 120Hz; with a peak at about 83Hz.
Al-Kalbani, Mohammed +5 more
openaire +2 more sources
Fast laser speckle suppression with an intracavity diffuser
Frontiers in Optics and Photonics, 2020 Fast speckle suppression is crucial for time-resolved full-field imaging with laser illumination. Here, we introduce a method to accelerate the spatial decoherence of laser emission, achieving speckle suppression in the nanosecond integration time scale.
Simon Mahler +5 more
semanticscholar +1 more source
Laser speckle reduction using polymer-stabilized liquid crystals doped with Ag nanowires
Heliyon, 2023 Miniaturized and pure static devices are expected to be used in laser-imaging systems for speckle reduction. In this study, a pure static device based on polymer-stabilized liquid crystal (PSLC) doped with Ag nanowires was developed to effectively ...
Xin Jiang +4 more
doaj +1 more source
Experimental observation of speckle instability in nonlinear disordered media
, 2005 Temporal fluctuations of the speckle pattern formed upon backscattering of a laser beam from an interface between gold and nonlinear polymer film have been observed as a function of optical power.
Agarwal +25 more
core +1 more source
Localization of Matter Waves in 2D-Disordered Optical Potentials [PDF]
, 2005 We consider ultracold atoms in 2D-disordered optical potentials and calculate microscopic quantities characterizing matter wave quantum transport in the non-interacting regime.
B. L. Altshuler +8 more
core +1 more source
Speckle experiments in random lasers [PDF]
Physical Review E, 2002 We present measurements of speckle in a random laser. We analyze its first-order statistics and show that, contrary to what might be expected for passive systems, analyses of the intensity distribution P(I) and the speckle spot size do provide information about light transport inside the system. P(I) is used to determine the degree to which an incident
van Soest, G. +2 more
openaire +3 more sources
Synchronized renal blood flow dynamics mapped with wavelet analysis of laser speckle flowmetry data. [PDF]
PLoS ONE, 2014 Full-field laser speckle microscopy provides real-time imaging of superficial blood flow rate. Here we apply continuous wavelet transform to time series of speckle-estimated blood flow from each pixel of the images to map synchronous patterns in ...
Alexey R Brazhe +3 more
doaj +1 more source
Normalized ghost imaging [PDF]
, 2012 We present an experimental comparison between different iterative ghost imaging algorithms. Our experimental setup utilizes a spatial light modulator for generating known random light fields to illuminate a partially-transmissive object.
Baoqing Sun +15 more
core +3 more sources
IEEE Photonics Journal, 2017 Sequential speckle reduction methods demand the usage of fast modulators due to the short integration period of human eyes. Here, a nonsequential speckle reduction method by splitting one laser beam with short coherence length into uncorrelated laser ...
Zhaomin Tong +3 more
doaj +1 more source