Results 41 to 50 of about 85,248 (291)

Investigation on Speckle-Free Imaging at the Output of a Multimode Fiber under Various Mode Excitation Conditions

Photonics, 2021
Speckle-free imaging using a multimode fiber has been widely used for imaging systems. Generally, previous work has assumed that all the propagating modes of the fiber are uniformly excited, but the modal power distribution is actually affected by ...
Jun Zhou, Zichun Le, Yanyu Guo, Zongshen Liu, Qiyong Xu, Yanxin Dai, Jiayu Deng, Jiapo Li, Di Cai   +8 more
doaj   +1 more source

Exoplanet detection with simultaneous spectral differential imaging: effects of out-of-pupil-plane optical aberrations [PDF]

, 2006
Imaging faint companions (exoplanets and brown dwarfs) around nearby stars is currently limited by speckle noise. To efficiently attenuate this noise, a technique called simultaneous spectral differential imaging (SSDI) can be used.
Macintosh, Bruce, Marois, Christian, Phillion, Don W.   +2 more
core   +2 more sources

Speckle Interferometric Observations With the Gemini 8-m Telescopes: Signal-to-Noise Calculations and Observational Results

Frontiers in Astronomy and Space Sciences, 2022
Using 3 years of observations with the Zorro and ’Alopeke speckle interferometric instruments at Gemini South and North, respectively, we present an analysis of the sensitivity of the data taken in two narrow-band optical filters centered at 562 and 832 ...
Steve B. Howell, Elise Furlan
doaj   +1 more source

A narrow-band speckle-free light source via random Raman lasing

, 2015
Currently, no light source exists which is both narrow-band and speckle-free with sufficient brightness for full-field imaging applications. Light emitting diodes (LEDs) are excellent spatially incoherent sources, but are tens of nanometers broad. Lasers
Bixler, Joel N., Cao, Hui, Dyer, Phillip N., Hokr, Brett H., Noojin, Gary D., Redding, Brandon, Rockwell, Benjamin A., Schmidt, Morgan S., Scully, Marlan O., Thomas, Robert J., Yakovlev, Vladislav V.   +10 more
core   +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, Bennink, Bromberg, Donoho, Duarte, Ferri, Ferri, Gatti, Gatti, Jeffrey H. Shapiro, Katz, Matthew P. Edgar, Miles J. Padgett, Shapiro, Stephen S. Welsh, Valencia   +15 more
core   +3 more sources

Speckle Theory for Arbitrary Wavefront Illumination in Free-Space Surface Scattering

IEEE Photonics Journal
Speckle has been shown to cause significant degradation to the imaging quality of laser imaging systems. However, in certain complex imaging environments, it can also act as an effective information carrier.
Qiyong Xu, Janan Zhou, Yipeng Mo, Zichun Le   +3 more
doaj   +1 more source

Single-Pixel Photoacoustic Microscopy with Speckle Illumination

Intelligent Computing, 2023
Wide-field optical-resolution microscopy with structured illumination and single-pixel detection has been the topic of a number of research investigations.
Antonio M. Caravaca-Aguirre, Florian Poisson, Dorian Bouchet, Nicolino Stasio, Philippe Moreau, Irene Wang, Edward Zhang, Paul Beard, Claire Prada, Christophe Moser, Demetri Psaltis, Ori Katz, Emmanuel Bossy   +12 more
doaj   +1 more source

Observation of Intensity-Intensity Correlation Speckle Patterns with Thermal Light

, 2014
In traditional Hanbury Brown and Twiss (HBT) schemes, the thermal intensity-intensity correlations are phase insensitive. Here we propose a modified HBT scheme with phase conjugation to demonstrate the phase-sensitive and nonfactorizable features for ...
Al-Amri, M., Wang, Li-Gang, Zubairy, M. Suhail   +2 more
core   +1 more source

Imaging blood cells through scattering biological tissue using speckle scanning microscopy

, 2013
Using optical speckle scanning microscopy [1], we demonstrate that clear images of multiple cells can be obtained through biological scattering tissue, with subcellular resolution and good image quality, as long as the size of the imaging target is ...
Psaltis, Demetri, Pu, Ye, Yang, Xin
core   +1 more source

Adaptive Speckle Imaging Interferometry: a new technique for the analysis of microstructure dynamics, drying processes and coating formation

, 2007
We describe an extension of multi-speckle diffusing wave spectroscopy adapted to follow the non-stationary microscopic dynamics in drying films and coatings in a very reactive way and with a high dynamic range.
Brun, Alice, Brunel, Laurent, Cipelletti, Luca, Snabre, Patrik   +3 more
core   +2 more sources