Sapphire Optical Glass | Sapphire Optical Substrate & Window Material - Felix Glass
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- Felix Glass Co., Limited
- Issue Time
- Oct 20,2026
Summary
Felix Glass custom fabricates sapphire domes, windows, lenses with AR / DLC coating for deep sea, aerospace and high-temperature optical systems.
Sapphire Optical Glass
Overview
Sapphire optical glass (single-crystal alumina, Al₂O₃) is one of the most widely used high-performance optical substrate materials. It features a broad transmission band ranging from ultraviolet (UV), visible light to mid-wave infrared. Compared with other optical materials, sapphire delivers outstanding scratch resistance, high thermal conductivity, excellent thermal shock resistance and strong resistance to corrosion, moisture and plasma erosion.
Its main limitation is relatively high refractive index and higher machining cost. Sapphire is the preferred choice when optical components need to survive extreme pressure, high temperature, abrasion and aggressive chemical environments.
Key Optical & Physical Properties
| Transmission Range | 0.15 μm – 5.5 μm |
|---|---|
| Refractive Index (@1μm) | 1.754 |
| Hardness (Mohs) | 9 |
| Density | 3.98 g/cm³ |
| Coefficient of Thermal Expansion | 5.8 ×10⁻⁶ /K |
| Max Operating Temperature | ~2000 ℃ |
Common Optical Components We Fabricate
- Sapphire optical windows
- Sapphire hemispherical / conical domes
- Sapphire spherical & plano-convex lenses
- Sapphire prisms, sapphire capillary tubes
- Custom sapphire blanks and shaped substrates
Coating Options
We can deposit functional coatings on sapphire parts according to customer requirements:
- AR Anti-Reflection coating (single-band, broadband UV-VIS-IR)
- DLC Diamond-Like Carbon protective coating
- Hard anti-abrasion coating, metal reflective coating
Typical Applications
- Deep-sea optical detection & underwater camera windows
- Aerospace, airborne and satellite optical systems
- High-temperature furnace observation viewports
- Plasma chamber, semiconductor processing optics
- High-speed machine vision and protective optics
Machining Capability
Felix Glass supports custom sapphire machining from blank to finished optics. We achieve surface quality up to 20/10 scratch/dig, surface flatness λ/10 @632.8nm. Available shapes include round, square, rectangular and special custom profiles. We hold tight thickness tolerance, parallelism and angular tolerance for precision optical assemblies.
Datasheet & Custom Inquiry
Download our sapphire material datasheet for full property curves and design reference. Send your drawings, dimension requirements and coating specs for a formal quotation.
Request Datasheet & Custom Quote