Broad Grade Selection
Choose from crown, flint, low-dispersion, high-index, filter, radiation-resistant, and other specialized glass families.
Optical Glass
Optical Glass Material Family
Engineered Glass Options for Imaging, Illumination, and Precision Optical Systems.
A broad family of optical glasses selected by refractive index, dispersion, transmission, homogeneity, thermal behavior, and environmental requirements. COE Sapphire supports custom components in customer-specified or application-matched glass grades.
Why Optical Glass
A Flexible Material Platform for Precision Optical Design
Optical glass is available in many controlled compositions, enabling engineers to balance refractive index, dispersion, wavelength range, weight, thermal response, chemical durability, and cost. This flexibility makes it suitable for lenses, prisms, windows, filters, and other precision optical components.
Controlled Optical Constants
Catalog grades provide characterized refractive index and dispersion for repeatable optical design and production.
Excellent Manufacturability
Optical glass can be ground, polished, edged, coated, cemented, and assembled into complex optical systems.
Cost-Effective Precision
Many grades offer a practical balance of optical performance, availability, production scalability, and cost.
Engineering Properties
Selection Depends on the Specific Glass Grade
Optical glass is a material family rather than one fixed composition. Values below describe the principal parameters engineers should specify. Final properties must be confirmed for the selected manufacturer and glass code.
Physical & Manufacturing Factors
| Material Family | Crown, flint, high-index, low-dispersion, filter, and specialty optical glass |
|---|---|
| Density | Grade dependent |
| Hardness | Grade dependent; generally suitable for conventional precision optical processing |
| Thermal Expansion | Grade dependent and important for mounting and thermal cycling |
| Chemical Durability | Varies by composition and environmental exposure |
| Annealing Quality | Fine anneal and precision anneal options may be specified |
| Available Forms | Blocks, strips, plates, molded blanks, cut blanks, and finished components |
Optical Selection Factors
| Refractive Index | Selected by glass code and design wavelength |
|---|---|
| Abbe Number / Dispersion | Selected to control chromatic aberration |
| Transmission Range | Grade, thickness, purity, and coating dependent |
| Homogeneity | Standard through high-homogeneity grades |
| Stress Birefringence | Controlled through annealing and processing |
| Internal Quality | Bubbles, inclusions, striae, and fluorescence specified by grade |
| Coating Compatibility | AR, reflective, beamsplitter, filter, and custom multilayer coatings |
Optical Transmission
Transmission Tailored by Glass Composition
Different optical glass families are optimized for ultraviolet, visible, near-infrared, filter, or radiation-resistant performance. Transmission depends on glass code, thickness, surface finish, and coating.
Representative only. Use the selected glass manufacturer’s data sheet for final design values.
Material Comparison
Choosing Among Common Transparent Optical Materials
| Selection Factor | Sapphire | BK7 | Fused Silica | Optical Glass Family |
|---|---|---|---|---|
| Grade Variety | Single-crystal material | Standard crown glass | Silica grades | Very Broad |
| Index / Dispersion Choice | Limited | Defined standard | Low index / low dispersion | Extensive |
| Environmental Durability | Excellent | Good | Excellent | Grade Dependent |
| Visible Optical Design | Very Good | Excellent | Excellent | Excellent |
| Cost Range | Higher | Low | Moderate | Broad |
Manufacturing Capabilities
From Selected Glass Grade to Finished Optical Component
COE Sapphire manufactures customer-specified optical glass components from prototypes through repeat production, with fabrication, coating, assembly, and inspection support.
Precision Machining
Cutting, generating, edging, beveling, drilling, and custom geometry fabrication.
Optical Polishing
Flat, spherical, cylindrical, and custom polishing to application-specific surface requirements.
Optical Coating
AR, reflective, beamsplitter, filter, and custom multilayer coatings.
Quality Assurance
Dimensional inspection, interferometry, surface inspection, and documentation.
Design Guide
Specify the Correct Optical Glass Grade and Component
Provide the preferred glass code or target optical constants, operating wavelengths, dimensions, tolerances, surface quality, wavefront or flatness, wedge, clear aperture, coating, quantity, and environmental conditions.
Discuss Your SpecificationGlass CodeManufacturer and grade, or required optical constants
Optical ConstantsRefractive index, Abbe number, and design wavelengths
Surface QualityCommercial through precision optical grades
GeometryWindows, lenses, prisms, filters, and custom forms
Internal QualityHomogeneity, striae, inclusions, and stress birefringence
CoatingsAR, reflective, beamsplitter, filter, and custom multilayers
Related Optical Components
Optical Glass Components Manufactured to Your Specification
Frequently Asked Questions
Optical Glass FAQ
What does “optical glass” mean?
It refers to glass compositions manufactured with controlled optical constants, internal quality, homogeneity, and transmission for precision optical use.
How is a glass grade selected?
Selection is based on refractive index, dispersion, wavelength range, thermal behavior, chemical durability, internal quality, availability, and cost.
Is optical glass the same as BK7?
No. BK7 is one widely used crown-glass grade. Optical glass includes many crown, flint, high-index, low-dispersion, filter, and specialty grades.
Can COE Sapphire work with customer-specified glass codes?
Yes. COE Sapphire can evaluate customer-specified grades or help identify suitable alternatives based on the application and required optical constants.
What components can be manufactured?
Windows, lenses, prisms, filters, mirrors, rods, plates, and custom geometries can be produced subject to grade availability and design requirements.
Can optical glass components be coated?
Yes. AR, reflective, beamsplitter, filter, and custom multilayer coatings can be matched to the selected glass and operating wavelength.
Custom Optical Glass Components
Request a QuoteNeed Help Selecting a Glass Grade?
Send your glass code, target optical constants, drawing, wavelength range, coating, and quantity for engineering review.