What Defines a Refractive Polymer Optic

A refractive optic changes the direction of light as it passes through a transparent medium. By varying surface curvature, refractive index, or geometry, polymer lenses can perform critical optical functions such as focusing, collimating, beam shaping, or light homogenization - often with lighter weight, lower cost, and higher integration potential than their glass counterparts.

Advantages of Molded Polymer Lenses

• Design freedom: Complex geometries such as aspherical, TIR, and freeform surfaces can be molded with no added cost penalty.
• Integration efficiency: Optical and mechanical features can be combined in a single molded element, reducing part count and assembly time.
• Lightweight performance: Polymers are 2–5× lighter than glass, ideal for handheld and airborne systems.
• High-volume scalability: Multi-cavity molds and rapid cycle times enable efficient production from thousands to millions of parts.
• Cost effectiveness: Thermoplastics such as PMMA, COP (Zeonex®, Zeonor®), and polycarbonate offer excellent optical quality with reduced raw-material and processing costs.

Design for Manufacturability (DFM)

Based on decades of expertise, G&H | GS Optics engineers provide our customers with DFM recommendations to ensure that their polymer optics programs are successful. Using mold flow simulations, we can model how resin will fill the mold during the injection molding process to better position gates, anticipate where knit lines will appear, and locate difficult to fill spots in the mold. G&H | GS Optics specializes in scientific injection molding which is a systematic, data-driven methodology to produce world class polymer optics.

Our integrated capabilities include:

• Single-point diamond turning for prototype and master tooling
• Precision injection molding (20 – 220 ton presses) for diameters 2.5 mm – 150 mm
• In-house thin-film coatings for AR and HR performance
• Class 10 000 (ISO 7) cleanroom for optical assembly
• Interferometric and CMM metrology for surface form, roughness, and dimensional verification

Material Selection for Refractive Optics

We mold optics using a range of optical-grade thermoplastics to match system requirements for transmission, mechanical strength, and stability:

• PMMA (Acrylic): Excellent clarity, high transmission in visible spectrum, often used for illumination and imaging lenses
• Polystyrene: High refractive index, low cost, often used for achromatic pairs and disposable optics
• Polycarbonate: Impact resistant, wide temperature range, often used for ruggedized and defense applications
• COP (Zeonex®, Zeonor ®): Low birefringence, low water absorption, often used for precision imaging and sensing optics
• OKP Polyester: High refractive index, low stress birefringence, often used for compact, high-performance optical designs

Quality Assurance and Process Validation

Refractive polymer lenses produced by G&H | GS Optics are subject to rigorous quality standards to ensure consistent, reliable performance. Each lens is measured using a variety of metrology equipment to verify dimensional accuracy, surface quality, and refractive characteristics.

To reduce risk after transferring from development to production, GS Optics can conduct a process validation through a combination of installation (IQ), operational (OQ), and performance (PQ) qualifications, ensuring process repeatability and consistent optical performance.

Quality assurance and process validation are separate activities