Customized Square Sapphire Optical Window with Through Hole

Product overview

Our square sapphire optical windows with through holes are precision-engineered from high-quality synthetic sapphire (Al₂O₃), one of the hardest optical materials available. These windows provide excellent mechanical strength, thermal stability, chemical resistance, and wide spectral transmission from UV to NIR. Designed for applications requiring both optical clarity and mechanical durability, they protect sensitive components while allowing light or laser transmission.

Featuring a through hole, these windows are ideal for mechanical integration, alignment, vacuum feedthroughs, fluid or gas channels, and other specialized applications.

Key Features

• Material: High-purity synthetic sapphire (Al₂O₃)

• Hardness: Knoop hardness ~1900 GPa, second only to diamond

• Density: 3.97 g/cm³

• Refractive Index (nd): 1.77

• Young’s Modulus: 435 GPa

• Thermal Stability: Excellent, suitable for high-temperature applications

• Chemical Resistance: Resistant to acids, alkalis, and most corrosive chemicals

• Optical Transmission: UV–Visible–NIR range

• Surface Quality: 80/50, 60/40, 40/20 (scratch/dig)

• Surface Flatness: Typical 2λ

• Clear Aperture: ≥90%

• Shape Options: Square, round, rectangular

• Thickness Options: Customizable, e.g., 0.5 mm – 2 mm (or more)

• Through Hole: Precisely drilled, customizable diameter and position

• Customizable: Plane parallelism, flatness, orientation, and material purity

Standard Sizes in Stock

Special orientations available: A-plane (1120), R-plane (1102), M-plane (1010), C-axis offcut 0.5°–10°, or fully customized orientations.

Customized Sizes: Examples include 10x10x0.5 mm, 20x20x0.5 mm, ultra-thin 2-inch wafers (100 µm), or patterned sapphire substrates (PSS).

Applications

• Laser and Optical Systems: High-durability windows for precise alignment and transmission

• Medical Devices: Fluidic interfaces and sterile viewports

• Aerospace & Defense: Sensors, optical access ports, and ruggedized equipment

• Semiconductor & Vacuum Equipment: Vacuum-sealed windows with feedthrough holes

• High-Temperature or Harsh Environments: Maintain optical performance under extreme conditions

Design Considerations

• Hole Diameter & Position: Precisely engineered to prevent cracking

• Chamfered Edges: Reduce stress around drilled holes

• Surface Finish: Critical for both optical clarity and mechanical tolerance

• Flatness & Parallelism: Can be customized for high-precision optical systems

FAQ

Q1: What materials are used in your sapphire windows?

A: We use high-purity synthetic sapphire (Al₂O₃), one of the hardest and most chemically resistant optical materials, offering excellent thermal stability and wide-spectrum optical transmission.

Q2: Can the windows be customized?

A: Yes. We offer customization for size, thickness, shape (square, round, rectangular), hole diameter and location, surface flatness, and crystal orientation according to your requirements.

Q3: How precise are the holes and surface quality?

A: Holes are precision-drilled with chamfered edges to minimize stress. Surface quality is high, with scratch/dig options of 80/50, 60/40, or 40/20 and flatness typically 2λ, ensuring optical clarity and durability.

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