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Case Study: Aspherized Achromatic Lenses in Retinal Detection

Achromatic lenses, designed to reduce chromatic aberration and minimize spherical aberrations, play a crucial role in various optical applications. These lenses are particularly valuable in fields such as fluorescence microscopy, image relay, inspection, and spectroscopy. Typically, achromatic lenses are constructed by either cementing or housing two elements together, resulting in smaller spot sizes compared to singlet lenses.

Key Advantages

  • Innovative Design: Cost-effective, color-corrected aspheric lens.
  • Enhanced Color Correction: Superior to traditional achromatic lenses.
  • Improved Aberration Correction: Comparable to precision-machined aspheric lenses.


Project Overview: Retinal Detection

In the medical field, specifically for detecting the human retina, the need for high transmittance in achromatic lenses was paramount. Achromatic lenses generally consist of a positive low refractive index (glass) element and a negative high refractive index (quartz glass) element. For this project, we utilized H-ZF & H-LAK high-transmittance glass to meet the stringent transmittance requirements. Special treatments during processing and polishing were employed to satisfy the specific needs of medical applications.


Aspheric Achromatic Lenses: Design and Manufacturing

The production of achromatic aspheric bonded lenses involves overcoming multiple technical challenges. Continuous advancements in optical technology have positioned these lenses at the forefront of modern lens design and manufacturing.


Design Complexity

Designing aspheric lenses requires addressing not only basic spherical aberrations, astigmatism, and chromatic aberrations but also ensuring precise control over various optical distortions. For achromatic lenses, the design criteria are even more rigorous, necessitating the optimization of optical performance while accommodating diverse materials, curvatures, and shapes.


Material Selection

Choosing the right optical materials is critical for aspheric bonded lenses. The refractive indices and dispersion properties of different materials must be precisely matched to minimize chromatic aberrations. Additionally, factors like stability and processability during manufacturing add another layer of complexity to material selection.


Bonding Challenges

The bonding process is a pivotal and challenging step in the production of aspheric bonded lenses. Achieving a uniform, bubble-free bond between elements is essential for maintaining structural integrity and optical performance. This step demands high precision and control.


Multi-stage Polishing

Polishing aspheric bonded lenses is particularly intricate due to their complex shapes. From rough polishing to precision polishing, the process requires high levels of craftsmanship and advanced polishing equipment. The surface accuracy of the lens directly impacts its final optical performance, necessitating meticulous control at every stage.


Coating Processes

Applying coatings to lenses is crucial for enhancing performance, particularly in reducing chromatic aberrations. Ensuring the uniformity and consistency of coatings is vital to prevent optical distortions, demanding strict coating processes and high-quality materials.


Rigorous Quality Control

Given the complexity of the manufacturing process, stringent quality control measures are essential. High-precision measurement and detection equipment are indispensable for verifying that the lenses meet design specifications, ensuring stability and reliability in their optical performance.

Crafted from high-transparency glass, aspheric achromatic lenses offer innovative design, cost-effectiveness, and superior color correction compared to conventional achromatic lenses. The project involved intricate procedures such as material selection, bonding challenges, multi-stage polishing, coating processes, and rigorous quality control. The sophisticated manufacturing process highlights the importance of aspheric achromatic lenses in advancing optical technology for medical diagnostics and other precision applications.

Contact Shanghai Optics today! We’d be more than happy to discuss your projects and how to best bring them to fruition.


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