Optical Adhesives
What are Optical Adhesives?
Optical adhesives are adhesives specially developed for applications in optical systems that fulfill precise optical properties such as transparency, refractive index, and transmission in addition to mechanical bonding. These adhesives are crucial for image quality in optical assemblies.
Properties of Optical Adhesives
- High transmission in visible and NIR spectral range
- Defined and stable refractive index
- Minimal birefringence to avoid distortions
- Excellent optical clarity without haze
- Minimal shrinkage for positional stability
- Low outgassing for clean optical surfaces
Optical Parameters
- Refractive index: n = 1.45 to 1.65 depending on formulation
- Transmission: > 99% in visible spectral range
- Abbe number: Characterization of chromatic dispersion
- Aging-resistant optical properties
Applications
- Camera Module Adhesive: Lens and sensor bonding
- Active Alignment: Precise component adjustment
- LiDAR systems: Laser optics and detectors
- Augmented reality: Prism bonding and waveguides
- Medical optics: Endoscopes and magnifiers
Curing Systems
- UV-curing systems: Fast and controlled curing
- Activis Technology: Light-activated precision curing
- Thermally curing systems: For temperature-stable connections
- Dual-curing systems: UV pre-curing with thermal post-curing
Processing Requirements
- Microdispensing: Precise application of smallest quantities
- Jet Valves: Contactless dispensing on optical surfaces
- Controlled bonding surface: Bubble and contamination-free surfaces
- Open time: Sufficient time for optical adjustment
Quality Requirements
- Interferometric testing of wavefront quality
- Transmission measurements across wavelength range
- Long-term stability of optical properties
- Climate resistance tests according to automotive standards
DELO Adhesive Solutions
- Broad portfolio of optical adhesives with various refractive indices
- IBOA-free formulations for safe processing
- Special systems for AR/VR and LiDAR applications
Looking for optical adhesives for your application?
