Circular Sapphire Windows High Transmittance 90% Sapphire Glass for Laser Applications

Product Description:

ZMSH’s Circular Sapphire Windows is a high-performance optical component made from 99.999% pure single-crystal sapphire (Al₂O₃). Designed for demanding applications, these sapphire windows offer over 90% transmittance across a broad spectrum (250nm–5500nm), excelling particularly in the infrared (3-5μm MIR) range, making them ideal for laser systems, semiconductor equipment, high-temperature industrial observation, and aerospace instrumentation. They are also commonly used in scientific instruments, medical devices, and optical sensors.

Sapphire, with a Mohs hardness of 9, provides 10 times the scratch resistance of standard optical glass, ensuring durability even in high-impact environments. With its high melting point of 2040°C, sapphire windows perform reliably in extreme heat, with continuous operation up to 800°C and short-term tolerance up to 1800°C. Additionally, these windows are chemically resistant to most acids, alkalis, and solvents, making them suitable for harsh industrial and chemical environments.

ZMSH offers customization of size (from 5mm to 300mm in diameter) and thickness (ranging from 0.3mm to 20mm), along with various coatings such as AR (anti-reflective) coatings, high-transmission coatings, and anti-soiling coatings. Using advanced CNC machining and laser processing technologies, we provide precise, tight tolerances (±0.01mm) and high surface quality (up to λ/10 flatness), ensuring that the windows meet the stringent demands of optical systems.

Key Features:

1. Superior Optical Performance:

   • Achieves >90% transmittance from 250nm to 5500nm, excelling in the infrared (3-5μm) range, making it perfect for laser and infrared imaging applications.

2. Exceptional Mechanical Strength:

   • With Mohs hardness of 9, the sapphire window offers 10x better scratch resistance than conventional optical glass, ensuring longevity in high-impact and abrasive environments.

3. Extreme Environmental Resistance:

   • Melting point: 2040°C, suitable for high-temperature environments.

   • Operates continuously at 800°C with short-term tolerance up to 1800°C.

   • Chemical resistance: Stable in acid/alkali environments (pH 1-13).

4. Thermal Stability:

   • The low thermal expansion coefficient of 5.3×10⁻⁶/°C ensures optical surface accuracy even under rapid thermal cycling, making it ideal for precision applications in fluctuating temperatures.

Technical Specifications:

• Material: Single-Crystal Sapphire (Al₂O₃)

• Density: 3.98 g/cm³

• Melting Point: 2040°C

• Mohs Hardness: 9

• Thermal Conductivity: 52 W/m·K

• Thermal Expansion: 5.3 × 10⁻⁶/°C

• Transmittance: >90% (250nm–5500nm)

• Surface Finish: DSP or SSP (Custom finishes available)

• Size Range: 5mm–300mm diameter, 0.3mm–20mm thickness

Primary Applications:

1. Laser Systems:

   • Sapphire circular windows are commonly used in CO₂ and fiber laser systems as output windows and protective lenses, enduring high-power laser irradiation (>5kW/cm²) while minimizing thermal lensing effects.

2. High-Temperature Industrial Observation:

   • Ideal for viewports in steelmaking and glass-forming equipment, maintaining optical clarity above 1000°C without fogging or deformation.

3. Aerospace & Defense:

   • These sapphire windows are used in electro-optical sensors and missile seekers, offering impact resistance against supersonic aerodynamic heating while maintaining optical clarity.

4. Scientific & Medical Instruments:

   • Sapphire circular windows are essential in synchrotron radiation equipment, endoscopes, and other high-performance optical systems, providing stable optical channels.

Frequently Asked Questions (FAQ):

1. What advantages do sapphire windows have over traditional glass?

   • Sapphire windows offer 10x higher scratch resistance (Mohs 9), better spectral transmission across UV to IR ranges, and superior thermal and chemical durability, making them ideal for high-performance applications in harsh environments.

2. Can sapphire windows be used for laser systems?

   • Yes, ZMSH provides laser-grade sapphire windows with anti-reflective (AR) coatings and high transmission coatings. These windows are perfect for high-power laser systems, offering minimal thermal lensing and long-term reliability.

3. Are sapphire windows resistant to high temperatures?

   • Sapphire windows have a high melting point of 2040°C, making them suitable for high-temperature environments. They can operate continuously at up to 800°C and endure short-term exposures up to 1800°C.

4. Can the size of sapphire windows be customized?

   • Yes, we offer full customization in diameter (from 5mm to 300mm) and thickness (from 0.3mm to 20mm) to fit specific project requirements. Our advanced machining ensures tight tolerances and superior surface finishes.