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

IF 2 4区 物理与天体物理 Q3 OPTICS
Anatoliy Lapchuk, Olexander Prygun, Ivan Gorbov, Yuriy Borodin, Andriy Kryuchyn, Olexander Butok, Yevhenii Morozov
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引用次数: 0

Abstract

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 illumination system with uniform illumination requires simultaneous reduction of temporal, spatial, and polarization coherence of the illumination laser beam, along with light intensity homogenization. To address this, we propose a compact passive optical scheme based on incoherent focusing of the laser beam using arrays of prisms with varying heights. The system also incorporates depolarization of a portion of the laser beam and an optical diffractive optical element employing a pseudo-random binary sequence to enhance speckle reduction and improve uniform illumination quality. We demonstrate that such a system can be assembled using readily available laser light sources and optical elements, and its operational principle is experimentally validated.
基于非相干聚焦的 RGB 激光投影仪无斑点均匀照明紧凑型无源系统
对 RGB 激光投影仪中主观斑点抑制的硬件机制进行的理论分析表明,要实现具有均匀照明的紧凑型无斑点被动激光照明系统,需要同时降低照明激光束的时间、空间和偏振相干性,并实现光强均匀化。为此,我们提出了一种紧凑型无源光学方案,其基础是利用高度不等的棱镜阵列对激光束进行非相干聚焦。该系统还采用了部分激光束的去极化技术和光学衍射光学元件,使用伪随机二进制序列来增强斑点减少效果并提高均匀照明质量。我们证明,这种系统可以使用现成的激光光源和光学元件进行组装,其工作原理也得到了实验验证。
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来源期刊
CiteScore
4.50
自引率
4.80%
发文量
237
审稿时长
1.9 months
期刊介绍: Journal of Optics publishes new experimental and theoretical research across all areas of pure and applied optics, both modern and classical. Research areas are categorised as: Nanophotonics and plasmonics Metamaterials and structured photonic materials Quantum photonics Biophotonics Light-matter interactions Nonlinear and ultrafast optics Propagation, diffraction and scattering Optical communication Integrated optics Photovoltaics and energy harvesting We discourage incremental advances, purely numerical simulations without any validation, or research without a strong optics advance, e.g. computer algorithms applied to optical and imaging processes, equipment designs or material fabrication.
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