Sapphire Optical Windows
Chenyu Optics manufactures custom sapphire optical windows with controlled dimensions, polished surfaces, chamfered edges and optional optical coatings. Sapphire is selected where optical transmission, mechanical hardness, thermal stability and chemical resistance are required in demanding industrial optical assemblies.
Product Overview
Sapphire optical windows are transparent protective components used to separate optical systems from external environments while maintaining stable optical performance. Compared with ordinary optical glass, sapphire offers much higher hardness, excellent wear resistance and good transmission from the ultraviolet to mid-infrared range.
They are commonly used in infrared imaging systems, laser protection windows, high-temperature observation ports, industrial sensors, optical instruments and harsh-environment inspection systems. For engineering projects, window performance is influenced by material grade, orientation, thickness, surface quality, flatness, parallelism and coating design.
Chenyu Optics supports custom sapphire window manufacturing according to drawings or application requirements, including round, square, rectangular and special-shaped windows. We can also provide polishing, chamfering, edging, coating, inspection and clean packaging for prototype and batch production.
Key Advantages
Application & Inspection Use
Sapphire windows are suitable for optical modules, sensor assemblies, inspection systems and harsh-environment observation ports where mechanical durability and stable optical transmission are required.
Typical Specifications
| Material | Sapphire / Al₂O₃ |
|---|---|
| Crystal Type | Single crystal sapphire, orientation available on request |
| Transmission Range | Approx. 0.17 – 5.5 μm, depending on thickness and coating |
| Refractive Index | Approx. 1.76 @ 550 nm |
| Hardness | Mohs 9 |
| Density | 3.98 g/cm³ |
| Surface Quality | 10-5, 20-10, 40-20, 60-40 or custom |
| Surface Flatness | λ/10, λ/4, λ/2 or custom @ 632.8 nm |
| Parallelism | ≤ 30 arcsec, ≤ 3 arcmin or custom |
| Diameter / Size | Custom round, square, rectangular or special-shaped windows |
| Thickness Tolerance | ±0.1 mm, ±0.05 mm or custom |
| Chamfer | 0.1 – 0.3 mm × 45° or drawing-based |
| Coating Options | Uncoated, AR, BBAR, metal coating and custom coatings |
Optical Transmission Characteristics
Why Chenyu Optics
Chenyu Optics focuses on custom optical component manufacturing for industrial, infrared and precision optical applications. We support drawing-based production, prototype verification and batch supply for customers who require non-standard optical components rather than standard catalog parts only.
Manufacturing Capability
Precision Polishing
Controlled polishing for flatness, surface quality and optical clarity.
Optical Coating
AR, BBAR and custom coating support for different wavelength ranges.
Inspection & Packaging
Dimensional inspection, optical performance review and clean protective packaging.
Custom Manufacturing Options
Dimensions & Geometry
Round, square, rectangular and special-shaped sapphire windows can be manufactured according to customer drawings, including custom thickness, diameter, edge form and clear aperture requirements.
Surface & Mechanical Quality
Surface quality, flatness, parallelism and chamfer specifications can be selected based on optical design, assembly method and environmental requirements.
Coating & Wavelength Design
Uncoated, single-band AR, broadband AR and other custom coatings can be designed for UV, visible, near-infrared or mid-infrared applications.
Material Comparison
| Material | Sapphire | Fused Silica | BK7 / Optical Glass |
|---|---|---|---|
| Hardness | Very high, Mohs 9 | Medium | Lower than sapphire |
| Transmission | UV to mid-infrared range | Excellent UV and visible transmission | Visible and near-infrared applications |
| Thermal Stability | High | High | Moderate |
| Typical Use | Protective windows, harsh environments, sensors | UV optics, laser optics, laboratory instruments | General optical windows and economical components |
Applications
Infrared Imaging
Thermal cameras, IR sensors and inspection systems.
UV & Visible Optics
Observation windows, instruments and optical protection.
Laser Systems
Protective windows for selected laser and beam delivery systems.
Harsh Environment Systems
High-temperature, abrasive or chemically demanding applications.
Industrial Sensors
Process monitoring, inspection and machine vision equipment.
Scientific Instruments
Spectroscopy, laboratory instruments and research systems.
FAQ
What is the typical transmission range of sapphire optical windows?
Sapphire optical windows typically transmit from about 0.17 μm to 5.5 μm. Actual transmission depends on window thickness, surface condition, crystal quality and coating design.
Can you manufacture sapphire windows according to custom drawings?
Yes. Chenyu Optics can manufacture custom diameters, square or rectangular windows, special shapes, thicknesses, chamfers and edge treatments according to drawings or application requirements.
What surface quality and flatness can be provided?
Common options include 60-40, 40-20, 20-10 or higher surface quality, with flatness such as λ/2, λ/4 or λ/10 depending on the size and application.
What coating options are available for sapphire windows?
Uncoated sapphire windows, AR coating, broadband AR coating and custom coating designs can be provided based on the required wavelength range and operating environment.
How does sapphire compare with fused silica or BK7?
Sapphire is usually selected when high hardness, scratch resistance, thermal stability and harsh-environment durability are important. Fused silica or BK7 may be more suitable for lower-cost or less mechanically demanding optical systems.
What information should I provide for quotation?
Please provide material, size, thickness, surface quality, flatness, parallelism, coating requirements, quantity, drawing and application wavelength if available.
Need Custom Sapphire Optical Windows?
Send us your drawing, wavelength range, size, thickness, coating requirements and quantity. Chenyu Optics will review the optical and mechanical specifications and provide a suitable manufacturing suggestion.