Product Overview

With a Mohs hardness of 9, second only to diamond, sapphire windows offer excellent scratch resistance and durability. They provide reliable optical performance across a wide wavelength range, from ultraviolet (UV) to infrared (IR), making them ideal for precision optical systems.

Manufacturing Process

Sapphire windows are produced through advanced crystal growth and precision machining technologies:

• Crystal Growth Methods
  • Kyropoulos (KY) Method
  • Edge-Defined Film-Fed Growth (EFG)
  • Czochralski (CZ) Method
• Processing Steps
  • Crystal orientation cutting (C-plane, A-plane, R-plane, etc.)
  • CNC shaping and edge profiling
  • Double-side lapping and polishing
  • Surface finishing (optical polish or matte/frosted finish)
  • Optional coatings (AR, HR, IR coatings)

These processes ensure tight dimensional tolerances and superior surface quality (up to λ/10 flatness and 10-5 scratch-dig).

Key Features

• Ultra-high hardness (Mohs 9) – excellent wear and scratch resistance
• Wide optical transmission (150 nm – 5500 nm)
• High thermal resistance – stable up to ~2000°C
• Excellent chemical inertness – resistant to acids and alkalis
• High mechanical strength – suitable for high-pressure environments
• Superior surface quality – ideal for precision optics

Applications

• Laser systems – protective windows and optical interfaces
• Infrared & UV optics – sensors, detectors, spectroscopy
• Semiconductor equipment – vacuum chambers and process monitoring
• Aerospace & defense – high-speed and high-temperature environments
• Medical devices – durable optical covers
• High-pressure systems – observation windows

Specifications

Customization Options

• Shape: round, square, rectangular, irregular
• Edge: chamfered, beveled, stepped
• Surface: double-side polished / single-side polished / frosted
• Coating: anti-reflection (AR), reflective (HR), filter coatings
• Precision machining based on drawings

FAQ

Q1: Why choose sapphire over glass or quartz?
A: Sapphire offers significantly higher hardness, better scratch resistance, and wider transmission range compared to standard glass or quartz, making it suitable for harsh environments.

Q2: Can sapphire windows withstand high temperatures?
A: Yes, sapphire can operate in environments up to ~2000°C, far exceeding most optical materials.

Q3: Is coating necessary?
A: It depends on the application. AR coatings are recommended to reduce reflection and improve transmission efficiency.

Q4: Can you provide custom sizes and shapes?

A: Yes, fully customized production is available based on drawings or specific requirements.