Silicon Optical Window

Silicon (Si) is a core high-performance crystal material for mid-infrared optical systems. Its high transmission in the 1200–7000nm mid-infrared band, high mechanical hardness, excellent thermal stability, and wear resistance make it an indispensable window component for infrared thermal imaging, industrial temperature measurement, laser equipment, security detection, and medical infrared optics. Scysgx uses high-purity single-crystal silicon substrates and more than 260 precision processing machines and 65 specialized inspection instruments to provide a complete closed-loop production line covering cutting, grinding, polishing, coating, and quality inspection. Silicon optical windows are available in round, square, and custom shapes, including stepped, slotted, and drilled designs, in sizes from 1–1000mm, with commercial-grade and high-precision options and flatness up to λ/20. Mid-infrared antireflection, DLC diamond-like carbon, and high-laser-damage-threshold coatings are available, providing highly precise, stable window solutions for mid-infrared optical systems. Some standard specifications are stocked long term for rapid delivery.

Infrared thermal imaging: windows for security thermal cameras, vehicle night vision, industrial temperature measurement and outdoor infrared detectors. Industrial monitoring: windows for high-temperature infrared detection, furnace-temperature monitoring and infrared spectrometers in high-temperature industry. Laser equipment: mid-IR laser protective windows and optical-path protection. Medical infrared optics: windows for medical thermal-imaging diagnosis and noninvasive infrared testing, meeting equipment stability requirements. Research and metrology: windows for infrared microscopes, Fourier infrared spectrometers and laboratory precision optics.

Dedicated high mid-IR transmission: excellent, stable transmission and extremely low absorption over 1200–7000nm (1.2–7μm), suiting most mid-IR systems. High hardness and wear resistance: Knoop hardness 1150, high strength, scratch/impact resistance and long life for harsh industrial and outdoor environments. High thermal stability: softening temperature 1500℃ and expansion coefficient as low as 2.55×10⁻⁶/℃, without significant optical deterioration at high temperatures, for high-temperature industry. Ultraprecision planar fabrication: high-precision flatness to λ/20, parallelism down to 1″ and surface quality to 10-5, without scratches or defects, ensure stable optical transmission. Full shape/specification customization: circular, square and irregular shapes with steps, slots, holes or counterbores, dimensions 1–1000mm and thickness 0.15–300mm suit diverse installations. Multiple coatings: mid-IR antireflection, DLC diamond-like carbon and high-laser-damage-threshold coatings improve transmission, wear resistance and laser tolerance. Two grades: commercial for general industry and high precision for research/medical applications, balancing performance and cost. IV. Core material advantages. Spectral coverage: high broadband mid-IR transmission over 1200–7000nm (1.2–7μm), a preferred dedicated mid-IR material without significant absorption or scattering. Optical properties: refractive index n_d=3.422, extremely low infrared scattering and high imaging contrast for infrared thermal imaging and detection. Physical properties: density 2.33g/cm³, Knoop hardness 1150, high strength, scratch resistance, excellent machinability and ultraprecision planar polishing. Thermal properties: expansion coefficient 2.55×10⁻⁶/℃, softening temperature 1500℃, outstanding heat resistance and thermal stability, without significant high-temperature thermal deformation. Application advantages: wear and environmental-corrosion resistance for industrial high-temperature monitoring, outdoor infrared detection and medical infrared equipment, with stable long-term performance. V. Customization. Shapes: circular, square, rectangular and irregular, including steps, slots, through-holes and counterbores, with nonstandard sizes available. Dimensions: diameter/side length 1–1000mm, thickness 0.15–300mm, optimized tolerance grades for equipment space requirements. Surface treatment: chamfering, edge grinding, ultraclean polishing and custom cleaning for cleanrooms and special environments. Coatings: band-specific mid-IR antireflection, DLC and high-laser-damage-threshold layers improve optical performance and durability. VI. Standard coatings. Mid-IR AR: dedicated 3–5μm and 8–12μm antireflection greatly improves mid-IR transmission and reduces reflection loss. DLC: improves surface hardness, contamination and scratch resistance and window life in industrial/outdoor environments. High-laser-damage-threshold coatings improve strong-laser tolerance and protect core optics in high-power mid-IR systems. Other functional coatings: high reflection and filtering for multifunction infrared optics. VIII. Yasi Optical advantages. Fully controlled in-house production: closed-loop blank cutting, milling/grinding, polishing, coating, inspection, cleaning and packaging, without outsourcing and with full traceability. Precision equipment: ZYGO interferometers, precision parallelism testers, optical dimensional measuring instruments and surface-quality testers control all parameters and ensure flatness, parallelism and transmission compliance. Oversize fabrication: batch production of 1–1000mm large-aperture silicon windows for high-end infrared systems. One-stop customization: shape, dimensions, tolerances and coatings, with optical-path adaptation support and dedicated nonstandard solutions. Two-grade delivery: commercial and high-precision grades, stable small/large-batch supply for general industry and advanced research/medical use. Stock and delivery: some standard products remain in stock for rapid delivery; controlled custom-order lead times meet project schedules. IX. Quality assurance. All silicon windows undergo ZYGO interferometric flatness, precision parallelism, optical dimensional, infrared transmission and surface-quality inspections to ensure 100% compliance. Automated ultrasonic ultraclean washing and vacuum moisture-proof packaging ensure transport and long-term stability for cleanrooms and harsh environments.