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 …

Compact passive system for speckle-free uniform illumination in RGB laser projectors based on incoherent focusing

A Lapchuk, O Prygun, I Gorbov, Y Borodin… - Journal of …, 2024 - iopscience.iop.org
A theoretical analysis of the hardware mechanisms for subjective speckle suppression in
RGB laser projectors has revealed that achieving a compact speckle-free passive laser …

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 …

Very efficient speckle suppression in the entire visible range by one two-sided diffractive optical element

A Lapchuk, G Pashkevich, O Prygun, I Kosyak, M Fu… - Applied Optics, 2017 - opg.optica.org
The impact of the precision and direction of motion of a two-dimensional (2D) diffractive
optical element (DOE) based on binary pseudo-random sequences on speckle suppression …

Full speckle suppression in laser projectors using two Barker code-type diffractive optical elements

A Lapchuk, A Kryuchyn, V Petrov, V Yurlov… - Journal of the Optical …, 2012 - opg.optica.org
The mathematical model of a speckle-suppression method based on two Barker code-type
diffractive optical elements (DOEs) moving in orthogonal directions is developed. The …

Optimal speckle suppression in laser projectors using a single two-dimensional Barker code diffractive optical element

A Lapchuk, A Kryuchyn, V Petrov, V Klymenko - JOSA A, 2013 - opg.optica.org
An effective method of speckle suppression using one 2D diffractive optical element (DOE)
moving with constant velocity based on the periodic Barker code sequence is developed …

Dispersion of speckle suppression efficiency for binary DOE structures: spectral domain and coherent matrix approaches

A Lapchuk, O Prygun, M Fu, Z Le, Q Xiong… - Optics express, 2017 - opg.optica.org
We present the first general theoretical description of speckle suppression efficiency based
on an active diffractive optical element (DOE). The approach is based on spectral analysis of …

Speckle reduction using phase plate array and lens array

M Xiaohui, A Wang, F Ma, S Wu, H Ming - Opto-Electronic Advances, 2020 - oejournal.org
In this paper, a solution for speckle reduction using phase plate array (PPA) and lens array
(LA) in a motionless way is proposed. The specially designed PPA is composed of sub …

Speckle reduction in laser picoprojector by combining optical phase matrix with twin green lasers and oscillating MEMS mirror for coherence suppression

JY Lee, TH Kim, BB Yim, JU Bu… - Japanese journal of …, 2016 - iopscience.iop.org
The combined speckle reduction method is proposed and designed for laser picoprojectors
taking small size, high optical power, and good image preservation into account. An optical …

Improved active tracking performance through a Hadamard speckle contrast reduction

EL Jenkins, DJ Burrell - Optics Letters, 2023 - opg.optica.org
We report wave-optics simulation results and benchtop experimental findings that
demonstrate reduced centroiding error through a Hadamard speckle contrast reduction …