Laser speckle reduction due to spatial and angular diversity introduced by fast scanning micromirror

MN Akram, Z Tong, G Ouyang, X Chen, V Kartashov - Applied optics, 2010 - opg.optica.org
We utilize spatial and angular diversity to achieve speckle reduction in laser illumination.
Both free-space and imaging geometry configurations are considered. A fast two …

Speckle reduction in laser projection using microlens-array screens

J Pauwels, G Verschaffelt - Optics express, 2017 - opg.optica.org
We report on a novel speckle reduction scheme using microlens arrays as screen material
for application in laser-based projection systems. The scheme is based on properly …

Speckle reduction in laser projection using a dynamic deformable mirror

TKT Tran, X Chen, Ø Svensen, MN Akram - Optics express, 2014 - opg.optica.org
Despite of much effort and significant progress in recent years, speckle removal is still a
challenge for laser projection technology. In this paper, speckle reduction by dynamic …

A large-size MEMS scanning mirror for speckle reduction application

F Li, P Zhou, T Wang, J He, H Yu, W Shen - Micromachines, 2017 - mdpi.com
Based on microelectronic mechanical system (MEMS) processing, a large-size 2-D
scanning mirror (6.5 mm in diameter) driven by electromagnetic force was designed and …

Speckle-free image in a laser-diode microscope by using the optical feedback effect

B Dingel, S Kawata - Optics letters, 1993 - opg.optica.org
Besides its desirable power level, the use of a laser as a light source in microscopes opens
the possibility of observing high signal-to-noise ratio images of dynamic phenomena that are …

Speckle reduction in laser projection systems by diffractive optical elements

L Wang, T Tschudi, T Halldorsson, PR Petursson - Applied optics, 1998 - opg.optica.org
In laser projection systems the observer in the far field of the image points on the screen will
recognize serious speckle noise. There are many methods to reduce or eliminate speckles …

Speckle reduction using deformable mirrors with diffusers in a laser pico-projector

HA Chen, JW Pan, ZP Yang - Optics express, 2017 - opg.optica.org
We propose a design for speckle reduction in a laser pico-projector adopting diffusers and
deformable mirrors. This research focuses on speckle noise suppression by changing the …

Speckle reduction in laser projection displays through angle and wavelength diversity

TTK Tran, Ø Svensen, X Chen, M Nadeem Akram - Applied optics, 2016 - opg.optica.org
Speckle is the main obstacle for the use of laser light sources in projection technology. This
paper focuses on speckle suppression by the reduction of temporal coherence which is …

Speckle suppression by controlling the coherence in laser based projection systems

Z Cui, A Wang, Z Wang, S Wang, C Gu… - Journal of Display …, 2015 - opg.optica.org
In this paper, the relationship between the coherence and the speckle contrast in a laser-
based projection display system is studied with the consideration of human visual percept …

Effect of incidence/observation angles and angular diversity on speckle reduction by wavelength diversity in laser projection systems

H Yamada, K Moriyasu, H Sato, H Hatanaka - Optics express, 2017 - opg.optica.org
The speckle reduction for laser projectors has been vigorously studied because speckle
causes a serious deterioration in image quality. Most speckle reduction methods can be …