Sapphire Windows

Sapphire Windows Description

Sapphire Windows are versatile optical components available in a wide range of types, including transmission windows, protective windows, coated optical windows, UV-grade windows, and reflective windows. Each type is designed to meet specific application needs, from precise imaging and laser systems to high-temperature, high-pressure, or corrosive environments. Made from high-purity single-crystal sapphire, they offer excellent hardness, thermal stability, chemical resistance, and broad-spectrum transparency, ensuring reliable performance and long-term durability.

Sapphire Windows Specifications

Item	Specification
Dimensions	Diameter up to 300 mm; for non-circular shapes, max diagonal ≤ 300 mm
Thickness	0.05–300 mm (For ultra-thin sheets, diameter-to-thickness ratio < 500:1)
Parallelism	10″
Thickness Uniformity	<2 μm @150 mm
Surface Quality	Options: 80/50, 60/40, 40/20, 20/10, 10/5
Flatness	PV: RMS ≤1/4λ @632.8 nm
Coating	Anti-reflective or blocking coating per customer request
Packaging	Tray packaging or cleanroom vacuum packaging

Sapphire Windows Types

Sapphire Coated Optical Window

Sapphire Coated Optical Window features single- or double-sided coatings to enhance transmittance or block specific wavelengths within the sapphire range (280–5500 nm). Designed for applications such as high-power lasers and precision optics, these windows combine the durability of sapphire with optimized coatings for improved performance and reliability.

Sapphire UV-Grade Window

Sapphire UV-Grade Window is made from high-purity KY sapphire, offering excellent transmission in the ultraviolet range. Standard sapphire transmits UV from around 220 nm, but our low-absorption KY sapphire extends the transmission edge down to 168 nm. Combined with precision coating technology, these windows deliver enhanced UV performance for advanced scientific, industrial, and optical applications.

Sapphire Transmission Window

Sapphire Transmission Window is one of the most widely used types of sapphire windows, designed to provide high optical clarity and transmittance. With precise surface flatness and superior polishing, wavefront distortion can reach 1/20λ, surface quality up to 10/5 grade, and surface roughness below 0.5 nm. These features make it ideal for imaging, high-power laser, and precision measurement applications.

Sapphire Single-Side Reflective Window

Sapphire Single-Side Reflective Window features a reflective coating on one side, providing high reflectivity while maintaining the inherent durability and optical clarity of sapphire. It is widely used in optical tracking, measurement, fiber reflection, and laser applications, gradually replacing traditional materials like quartz due to its superior stability. With surface flatness up to 1/20λ, surface quality of 10/5 grade, and surface roughness below 0.5 nm, it ensures precise optical performance. Additional coating options, including metal reflective and anti-reflective layers, are also available.

Ultra-Thin Sapphire Window

Ultra-Thin Sapphire Window refers to optical flat windows with a thickness below 0.1 mm, designed for applications requiring minimal thickness and high transparency. Using advanced double-sided polishing equipment with precise pressure control, Heeger Materials can reliably produce ultra-thin sapphire windows ranging from 0.05 mm to 0.1 mm in batch quantities, ensuring excellent flatness, surface quality, and optical performance.

Sapphire Protective Window

Sapphire Protective Window is a high-strength, transparent single-crystal aluminum oxide (Al2O3) component designed to shield sensitive instruments and optical devices from harsh environments. It combines excellent hardness, thermal stability, and chemical resistance, making it ideal for use in laser systems, sensors, high-pressure chambers, and industrial machinery. Its optical clarity ensures minimal signal distortion while providing reliable protection.

Sapphire Infrared Transmittance at Different Thicknesses

Sapphire Windows Key Features

• Flaw-Free Appearance: Free from chips, cracks, or internal defects, preventing defect propagation and ensuring long-term reliability and durability.
• High-Purity Material: Made from KY-grown sapphire crystals with ultra-high purity, total impurity content <2 ppm, offering low absorption and high transmission in the ultraviolet range.
• Superior Surface Quality: Polished to a surface quality of at least 40/20, with roughness <0.2 nm and flatness better than 1/20λ, ensuring excellent optical performance.

Sapphire Windows Applications

• Optical Sensors and Detectors: Protect sensitive components while maintaining high optical clarity for accurate measurements.
• High-Power Laser Systems: Withstands intense laser exposure, providing durability and stable optical performance.
• Industrial Monitoring: Serves as observation windows in high-temperature, high-pressure, or corrosive environments.
• Scientific and Research Equipment: Supports precision imaging, spectroscopy, and measurement applications.
• Underwater and Harsh Environment Equipment: Used in deep-water detection, oilfield exploration, and chemical processing for reliable protection and observation.