Speckle reduction methods in laser-based picture projectors

MN Akram, X Chen - Optical Review, 2016 - Springer
Laser sources have been promised for many years to be better light sources as compared to
traditional lamps or light-emitting diodes (LEDs) for projectors, which enable projectors …

Efficient method for controlling the spatial coherence of a laser

M Nixon, B Redding, AA Friesem, H Cao… - Optics Letters, 2013 - opg.optica.org
An efficient method to tune the spatial coherence of a degenerate laser over a broad range
with minimum variation in the total output power is presented. It is based on varying the …

A low speckle laser pico-projector using dynamic light scattering liquid crystal devices

YH Chen, JW Pan, SC Jeng - Displays, 2022 - Elsevier
A dynamic light scattering liquid crystal (DLS-LC) device is applied to reduce speckle from a
laser pico-projector. The DLS-LC device produces time-varying scattering patterns, which …

Demonstration of a home projector based on RGB semiconductor lasers

Y Zhang, H Dong, R Wang, J Duan, A Shi, Q Fang… - Applied …, 2012 - opg.optica.org
In this paper, we demonstrate a high-definition 3-liquid-crystal-on-silicon (3-LCOS) home
cinema projection system based on RGB laser source modules. Both red and blue laser …

Laser speckle reduction via colloidal-dispersion-filled projection screens

F Riechert, G Bastian, U Lemmer - Applied optics, 2009 - opg.optica.org
We use projection screens filled with colloidal dispersions to reduce laser speckle in laser
projection systems. Laser light is multiply scattered at the globules of the colloidal …

Enhancing laser speckle reduction by decreasing the pitch of a chiral nematic liquid crystal diffuser

DJ Hansford, Y Jin, SJ Elston, SM Morris - Scientific Reports, 2021 - nature.com
The artefact known as speckle can plague numerous imaging applications where the narrow
linewidth of laser light is required, which includes laser projection and medical imaging …

Speckle contrast for superposed speckle patterns created by rotating the orientation of laser polarization

Z Tong, X Chen - JOSA A, 2012 - opg.optica.org
For a rough diffuser that fully depolarizes a linearly polarized laser, the speckle contrast of a
fully developed speckle image can be reduced from 1 to 0.5 by polarization diversity. This …

Combination of micro-scanning mirrors and multi-mode fibers for speckle reduction in high lumen laser projector applications

Z Tong, W Shen, S Song, W Cheng, Z Cai, Y Ma… - Optics …, 2017 - opg.optica.org
In high lumen laser projectors, it is required to use laser diodes coupled to multi-mode fibers
(MMFs) to obtain a high power illumination module. In this paper, we have fabricated an …

Real-time detection of DNA hybridization on microarray using a CCD-based imaging system equipped with a rotated microlens array disk

T Mogi, K Hatakeyama, T Taguchi, H Wake… - Biosensors and …, 2011 - Elsevier
This work describes a novel charge-coupled device (CCD)-based imaging system (MB
Biochip Reader™) for real-time detection of DNA hybridization to DNA microarrays. The MB …

Speckle contrast reduction of laser light using a chiral nematic liquid crystal diffuser

DJ Hansford, JAJ Fells, SJ Elston, SM Morris - Applied Physics Letters, 2016 - pubs.aip.org
High coherence in laser light causes spatially distributed interference called speckle. In
applications such as holographic projection, this undesirable side effect degrades image …