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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Journal ArticleDOI
Speckle denoising techniques in imaging systems
Manoj Kumar,Yassine Tounsi,Karmjit Kaur,Abdelkrim Nassim,Fernando Mandoza-Santoyo,Osamu Matoba +5 more
Journal ArticleDOI
Suppressed speckle contrast of blue light emission out of white lamp with phosphors excited by blue laser diodes for high-brightness lighting applications
Kinoshita Junichi,Ikeda Yoshihisa,Yuji Takeda,Ueno Misaki,Yoji Kawasaki,Yoshiaki Matsuba,Atsushi Heike +6 more
TL;DR: In this paper, the speckle contrast of high-brightness white lamps using phosphors excited by InGaN/GaN blue laser diodes is evaluated as a measure of coherence.
Journal ArticleDOI
Speckle Reduction for Holographic Display Using Optical Path Difference and Random Phase Generator
TL;DR: The proposed speckle reduction method does not contain any mechanical movement nor time-multiplexing technique, therefore, the system is stable and free from the frame rate degradation or additional computation load, and the angle diversity method is adopted with the proposed method to intensify the speckel reduction.
Journal ArticleDOI
Combination of micro-scanning mirrors and multi-mode fibers for speckle reduction in high lumen laser projector applications.
Zhaomin Tong,Wenjiang Shen,Shaohua Song,Cheng Wenzhi,Zhuo Cai,Yifei Ma,Lei Wei,Weiguang Ma,Liantuan Xiao,Suotang Jia,Xuyuan Chen +10 more
TL;DR: The demonstrated electromagnetic micro-scanning mirror (EM-MSM) has a promising potential in high lumen laser projector applications and can endure the high power of the laser module.
Journal ArticleDOI
Full speckle suppression in laser projectors using two Barker code-type diffractive optical elements.
TL;DR: The model indicates that the one pair of DOEs can be used for laser beams of different colors and can decrease the speckle contrast to less than 5%, which is below human eye sensitivity, with an optical efficiency greater than 90%.
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.