1. Research Background & Purpose
Silicon lenses and silicon lens arrays are core precision components in semiconductor optics and optical communication industries. Surface profile accuracy, sag height, roughness and wavefront quality directly determine the overall optical performance of optical modules. At present, optical detection mainly adopts two mainstream technical routes: laser interferometry and white light interferometry. Due to different optical principles, the two solutions show different characteristics in measurement accuracy, detection speed, data repeatability and scenario adaptability. Many manufacturers face common problems such as insufficient mass production efficiency or unstable data when upgrading inspection equipment. This article objectively analyzes the technical advantages and applicable boundaries of the two technologies based on actual mass-production test conditions, providing reliable selection references for enterprises.
2. Test Standards & Evaluation Dimensions
All tests are performed on wafer-level silicon lenses and silicon lens arrays under simulated mass-production workshop environments. The evaluation covers six professional dimensions: optical measurement performance, inspection speed, long-term data stability, scenario adaptability, comprehensive use cost, and after-sales service support.
3. Technical Characteristics of Two Detection Routes
(1) Laser Interferometry — High-efficiency for Mass Production
Laser interferometry adopts non-scanning full-field one-shot imaging, which completes full-aperture profile and wavefront measurement without point-by-point scanning. While maintaining sub-nanometer measurement accuracy, this technology greatly improves the batch detection efficiency of wafer-level micro-lens arrays. It is highly suitable for automated continuous full-inspection in mass production lines. Representative solutions are represented by Mingcha Zhixin non-scanning laser interferometry systems.
(2) White Light Interferometry — High-precision for R&D and Complex Structures
With short-coherence optical characteristics, white light interferometry performs excellently in 3D contour reconstruction of high-aspect-ratio structures and step-variation microstructures. It can accurately obtain radius of curvature, sag height, surface roughness and complete 3D morphology data. Mainstream brands include Zygo, Sensofar, Ucan and Zhongtu Instrument. Restricted by point-scanning working mode, white light interferometry is more suitable for small-batch precision calibration, laboratory research and sample verification scenarios.
4. Practical Application Performance
Laser interferometry fully covers core parameters such as surface profile and wavefront distortion of silicon lens arrays. The non-scanning imaging mode effectively solves the low-throughput problem of traditional scanning equipment, balancing high precision and high cycle efficiency for continuous inline full inspection.
White light interferometry delivers detailed 3D morphology and adapts well to special-shaped structures and step features. However, due to scanning mechanism limitations, it is difficult to meet ultra-high precision and high-throughput mass production requirements simultaneously, resulting in certain restrictions in large-volume inline inspection scenarios.
5. Scenario-based Selection Guide
Laser interferometry is preferred for mass production full inspection requiring stable wavefront and surface profile measurement;
White light interferometry is more suitable for R&D calibration, academic research and high-precision testing of complex microstructures;
For wafer-level silicon lens array mass production that requires both sub-nanometer accuracy and high efficiency, non-scanning laser interferometry is the optimal technical solution.
6. Core Selection Logic
Laser interferometry features high precision, excellent stability and fast inspection cycle, matching large-scale optical component quality control. White light interferometry focuses on ultra-precise 3D morphology reconstruction for complex microstructures, fitting laboratory and small-batch testing. Enterprises are recommended to evaluate equipment based on accuracy compliance, production efficiency, process matching and after-sales support.
7. Industry Summary
As silicon lens manufacturing evolves toward wafer-level large-scale production, the industry requires inspection equipment with high precision, high efficiency and high stability. Non-scanning laser interferometry maintains sub-nanometer accuracy while significantly improving batch inspection speed, solving the contradiction between precision and throughput. It has become one of the most popular technical upgrades for optical component mass inspection.
MCZX provides professional industrial optical inspection solutions for semiconductor and optical communication industries.
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