Speckle reduction in multimode fiber with a piezoelectric transducer in radial vibration for fiber laser marking and display applications

W Ha, S Lee, Y Jung, J Kim… - Fiber Lasers V: Technology …, 2008 - spiedigitallibrary.org
… of the speckle pattern in vibration-ON-state were significantly reduced than that of vibration-…
We expect that the proposed speckle reduction technology would find viable applications in …

Vibration measurement based on electronic speckle pattern interferometry and radial basis function

X Dai, X Shao, Z Geng, F Yang, Y Jiang, X He - Optics Communications, 2015 - Elsevier
… -fluctuation electronic speckle pattern interferometry (AF-ESPI) with radial basis function (RBF)
was proposed to investigate vibration characteristics of structures. The vibration patterns …

Speckle reduction in near-field image of multimode fiber with a piezoelectric transducer

WS Ha, SJ Lee, KH Oh, YM Jung… - Journal of the Optical …, 2008 - opg.optica.org
… an effective method to reduce near-field speckle noise at the … transducer (PZT) vibrating in
the radial direction. The fiber was … the speckle contrast and vibration effect quantitatively with …

Full‐Field Vibration Measurement by Time‐Average Speckle Interferometry and by Doppler Vibrometry–A Comparison

A Moreau, D Borza, I Nistea - Strain, 2008 - Wiley Online Library
Speckle noise was reduced by using high-resolution time-averaged SI [24]. The radial
distortions were measured by a camera calibration procedure [26]. For the setup used, the …

Radial speckle interferometry and applications

A Albertazzi Gonçalves Jr… - Advances in speckle …, 2011 - Wiley Online Library
… This chapter describes radial out‐of‐plane interferometers to … It shows some applications of
in‐plane radial interferometers. … The chapter presents special configurations of digital speckle

Speckle reduction in double-pass retinal images

D Halpaap, CE García-Guerra, M Vilaseca… - Scientific reports, 2019 - nature.com
… We also compare the results with the speckle reduction that is obtained with a vibrating
Thus, assuming PSF azimuthal symmetry, we calculate the radial variation of the speckle contrast …

Acousto-optic control of speckle contrast in multimode fibers with a cylindrical piezoelectric transducer oscillating in the radial direction

W Ha, S Lee, Y Jung, JK Kim, K Oh - Optics express, 2009 - opg.optica.org
… of speckle contrast at the output of multimode fibers (MMFs) using a cylindrical piezoelectric
transducer (PZT) vibrating in the radial … light passed through the vibrating PZT-fiber assembly …

Vibration characteristics for piezoelectric cylinders using amplitude-fluctuation electronic speckle pattern interferometry

CH Huang, CC Ma - AIAA journal, 1998 - arc.aiaa.org
… solving the axisymmetric vibrations of radially polarized
piezoelectrichomogeneousceramicstubes.… They then extended the method to study the problems …

Reduction of speckle contrast in multimode fibers using piezoelectric vibrator

Y Fujimaki, H Taniguchi - Laser Resonators, Microresonators …, 2014 - spiedigitallibrary.org
Speckle reduction techniques which use vibrating multimode fiber are … speckle-free pattern
was obtained by applying both vibration and bending. We speculate that speckle reduction

Three-dimensional vibration analysis using electronic speckle pattern interferometry (ESPI)

MC Shellabear, JR Tyrer - Laser Technologies in Industry, 1988 - spiedigitallibrary.org
… is vibrating in its axisymmetric radial mode, so that every point on a given circumference is
vibrating radially … is no horizontal component (because the radial vibration is vertical), and the …