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Random Microlens Array
Optical Lenses

Random Microlens Array

Supplier
Zhilanweina
Category
Optical Lenses
Origin
China

Microlens arrays are typical micro/nano-optical elements: many micrometer-to-millimeter lenslets form a two-dimensional array on one substrate in periodic rectangular, hexagonal, or other arrangements. Each lenslet independently focuses light, modulates phase, divides wavefronts, homogenizes beams, or performs light-field imaging. They provide functions beyond conventional optics, enable new optical systems, and are lightweight, compact, and easily integrated. Definition: random microlens arrays comprise numerous micrometer-to-millimeter lenslets. Unlike regular arrays, lenslet positions, apertures, curvature radii, or focal lengths are randomly distributed, as illustrated below. Key parameters: 1. Mean center spacing, a statistical equivalent-density parameter describing average lenslet spacing. 2. Focal length, the actual operating focal length of an individual random-array lenslet. 3. Fill factor, the clear-area fraction. 5. Surface shape, mainly spherical, with aspheres also available for precise spherical-aberration correction. Working principles: 1. Random sub-beam phase modulation. Coherent incident laser light is divided into many sub-beams. Random lenslet positions and sags create different optical path lengths, removing fixed periodic phase relationships and disrupting coherent interference conditions, strongly suppressing regular interference spot arrays. 2. Incoherent superposition for homogenization. Many phase-mismatched sub-beams reach the target without stable constructive/destructive interference; their intensities add statistically, reshaping a Gaussian laser spot into uniform illumination and thereby eliminating speckle as stated. 3. Random angular diffusion. Random curvatures/apertures produce different output divergence angles. Sub-spots at different angles overlap at the target, smoothing local intensity variations and further improving uniformity. Manufacturing/customization: the company describes itself as an early Chinese independent developer of precision micro/nano optics, with years of R&D and industrial experience. Its engineers specialize in optical design, micro/nanofabrication, and precision inspection, with extensive practical microlens-array/diffractive-optics experience to solve nonstandard optical designs and process challenges independently. An integrated in-house micro/nanolithography line provides full independent development/production of random arrays. Pitch machining accuracy consistently reaches micrometer levels; overall surface uniformity is described as industry-leading, fill factors approach full coverage, and light utilization is high. Substrates include fused silica, silicon, germanium, and ZnSe for UV through far IR. Custom high-performance antireflection and laser-damage-resistant coatings withstand intense lasers and maintain performance at high/low temperatures. The team controls optical simulation, customized structural optimization, prototypes, mass production, and complete outgoing optical inspection. Small research/university prototypes and large industrial orders are supported. Short lead times and dedicated engineer support provide rapid setup and problem correction, with complete solutions for beam shaping/homogenization, Hartmann wavefront sensing, and light-field reconstruction. Random arrays are already widely used in Hartmann sensing, light-field imaging, precision laser processing, CCD light coupling, and thermal IR imaging. Process precision, stable quality, and technical after-sales support have secured long-term collaboration and recognition from research institutions and listed equipment companies. The company describes itself as one of the few Chinese benchmark manufacturers independently developing and mass-producing the full microlens-array chain, offering technical, capacity, and after-sales assurance for custom work. Image captions: random microlens-array schematic; microscope test image; interferometer side-view test image.

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Overview

Microlens arrays are typical micro/nano-optical elements: many micrometer-to-millimeter lenslets form a two-dimensional array on one substrate in periodic rectangular, hexagonal, or other arrangements. Each lenslet independently focuses light, modulates phase, divides wavefronts, homogenizes beams, or performs light-field imaging. They provide functions beyond conventional optics, enable new optical systems, and are lightweight, compact, and easily integrated. Definition: random microlens arrays comprise numerous micrometer-to-millimeter lenslets. Unlike regular arrays, lenslet positions, apertures, curvature radii, or focal lengths are randomly distributed, as illustrated below. Key parameters: 1. Mean center spacing, a statistical equivalent-density parameter describing average lenslet spacing. 2. Focal length, the actual operating focal length of an individual random-array lenslet. 3. Fill factor, the clear-area fraction. 5. Surface shape, mainly spherical, with aspheres also available for precise spherical-aberration correction. Working principles: 1. Random sub-beam phase modulation. Coherent incident laser light is divided into many sub-beams. Random lenslet positions and sags create different optical path lengths, removing fixed periodic phase relationships and disrupting coherent interference conditions, strongly suppressing regular interference spot arrays. 2. Incoherent superposition for homogenization. Many phase-mismatched sub-beams reach the target without stable constructive/destructive interference; their intensities add statistically, reshaping a Gaussian laser spot into uniform illumination and thereby eliminating speckle as stated. 3. Random angular diffusion. Random curvatures/apertures produce different output divergence angles. Sub-spots at different angles overlap at the target, smoothing local intensity variations and further improving uniformity. Manufacturing/customization: the company describes itself as an early Chinese independent developer of precision micro/nano optics, with years of R&D and industrial experience. Its engineers specialize in optical design, micro/nanofabrication, and precision inspection, with extensive practical microlens-array/diffractive-optics experience to solve nonstandard optical designs and process challenges independently. An integrated in-house micro/nanolithography line provides full independent development/production of random arrays. Pitch machining accuracy consistently reaches micrometer levels; overall surface uniformity is described as industry-leading, fill factors approach full coverage, and light utilization is high. Substrates include fused silica, silicon, germanium, and ZnSe for UV through far IR. Custom high-performance antireflection and laser-damage-resistant coatings withstand intense lasers and maintain performance at high/low temperatures. The team controls optical simulation, customized structural optimization, prototypes, mass production, and complete outgoing optical inspection. Small research/university prototypes and large industrial orders are supported. Short lead times and dedicated engineer support provide rapid setup and problem correction, with complete solutions for beam shaping/homogenization, Hartmann wavefront sensing, and light-field reconstruction. Random arrays are already widely used in Hartmann sensing, light-field imaging, precision laser processing, CCD light coupling, and thermal IR imaging. Process precision, stable quality, and technical after-sales support have secured long-term collaboration and recognition from research institutions and listed equipment companies. The company describes itself as one of the few Chinese benchmark manufacturers independently developing and mass-producing the full microlens-array chain, offering technical, capacity, and after-sales assurance for custom work. Image captions: random microlens-array schematic; microscope test image; interferometer side-view test image.

Specifications

ParameterValue
Substrate MaterialFused Silica, Silicon, Germanium, Zinc Selenide

Applications

Laser projection equipment and AR/VR structured-light projection modules: randomizing coherent phases between sub-beams eliminates regular interference fringes in projected images, avoids fixed-pattern defects, and keeps images clean and orderly. Industrial laser welding, uniform surface illumination for laser etching, and research laser illumination: replacing the laser's native Gaussian energy distribution with a uniform area source gives workpieces consistent illumination and improves processing and experimental consistency. 3D facial recognition speckle projection, machine vision inspection of overall appearance, and infrared supplementary illumination: overlapping spots with different divergence angles smooths brightness differences, greatly improving overall target-plane illumination uniformity and the accuracy of three-dimensional recognition and visual inspection.

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Supplier Information

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Zhilanweina
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Chengdu Zhilan Micro-Nano Technology Co., Ltd. focuses on micro-nano optics, engaging in the design, fabrication, and application of micro-nano optical structures. The company masters continuous-surface micro-optical element processing technology based on grayscale modulation, capable of designing high-performance microlens arrays, diffractive optical elements (DOE), complex field modulation elements, etc. Products include microlens arrays, phase plates, DOEs, gratings, photomasks, etc., which have been applied in space exploration, 3D imaging, optoelectronic measurement, smart home, human-computer interaction, and other fields, cooperating with nearly a hundred domestic institutions. Adhering to the principle of customer first, the company provides professional services in optical design, component processing, system integration, etc.

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