
Flexible Light Guides
Precision for Demanding Applications.
Flexible light guides, custom-manufactured to your specifications in outstanding quality. Thanks to years of specialized knowledge and experience in the industry, as well as the highest quality standards, our flexible light guides are used in many different sectors.
Excellent Light Transmission & Precise Control
Efficient Light Transmission
Our products ensure efficient and low-loss light transmission through optimized NA values.
Color-Accurate Imaging
Minimal color shift: Illuminated objects retain their natural color, even with long light guides.
High Light Acceptance
Through an optimized numerical aperture (NA), our light guides capture a maximum amount of light right at the coupling point.
Numerical Aperture (NA) for Your Project
The numerical aperture is a critical factor for the light acceptance and the emission angle of light guides. As our graphic illustrates, the numerical aperture directly influences the angle (θ) at which light enters or exits the light guide:
- A higher NA allows for a larger acceptance angle, and thus, higher light acceptance.
- Our light guides are available with different NA values to ensure an optimal match for your specific requirements.
Manufacturing Process
To ensure our light guides and fiber optic products meet the highest standards, we rely on a specialized manufacturing process. This allows us to guarantee exceptional chemical and tactile robustness so they can perform optimally in their respective environments. Precision is a critical factor in this, true to our motto: “Making the impossible happen.”
Materials Used
- Borosilicate: Glass with high temperature resistance and chemical resilience.
- PMMA (Polymethylmethacrylate): A thermoplastic, lightweight plastic with high light transmittance.
- Silica-Hard Clad: A robust plastic coating for improved strength and durability.
- Silica-Silica for UV and NIR Wavelengths: Our specialized glass fibers, optimized for the transmission of light in the ultraviolet (UV) and near-infrared (NIR) ranges.
PMMA is a thermoplastic material, known under brand names such as Plexiglas or acrylic glass. In fiber optics, PMMA is used for:
- Flexible, cost-effective fiber optic cables are used
- Large core diameters (up to several millimeters)
- Applications using visible light
PMMA fibers are less temperature-resistant than glass fibers (max. 70-100°C), but significantly more flexible and less expensive. This makes them a particularly good choice for lighting or sensors where extreme temperatures are not present.

Borosilicate (also called “boron glass”) is a special type of glass with a high boron oxide content. It is the same material used to make heat-resistant laboratory glassware and baking molds. In fiber optics, it offers:
- Excellent chemical resistance to acids and alkalis
- Good temperature resistance up to approximately 400-500°C
- Low thermal expansion (less stress during temperature changes)
Ideal for standard industrial applications and lighting.

Optional Specifications:
- Various apertures available
- Polarization can be maintained
- Anti-reflection coating possible
- Various lengths, diameters, bending radii, converters, and vacuum feedthroughs optional
- Various connectors and ferrules suitable for industry and medicine
SMA (Sub-Miniature A) is a standard screw-type connector for fiber optic cables, designed for laboratory equipment and spectrometers. The connector has a 1/4″-36 thread. FSMA is the fiber optic version with a specially protected ferrule for the sensitive fiber end face. Standardized connectors allow you to connect our cables directly to your equipment, or we can manufacture custom connectors for your specific application.

Silica-silica fibers consist entirely of high-purity quartz glass (silicon dioxide), both the core and the cladding. This construction offers:
- Extremely high temperature resistance up to 1000°C
- Optimal transmission in the UV range (below 300 nm)
- Excellent transmission in the NIR range (1000-2500 nm)
- Minimal absorption losses
Therefore, these fibers are primarily used in high-performance lasers, UV curing, and spectroscopy.

Applications
Our light guides are suitable for a variety of applications where precise light transmission and color fidelity are essential, such as:
- Medical Technology
- Industrial Lighting
- Sensor Technology
- Photometry
… and much more!
Learn More
Do you require further information, a customized quote, or expert consultation for your project? We are at your disposal at any time.es Angebot oder eine fachkundige Beratung für Ihr Projekt? Wir stehen Ihnen jederzeit zur Verfügung.

Reliability doesn’t happen by chance.
At FOS Inon Optics, quality is not just a promise—it is a standard that can be measured. Our development and manufacturing processes for fiber-optic systems are ISO 9001:2015 certified. This establishes the foundation for reliable performance, reproducible results, and trust wherever optical precision is critical.





