Silicon Window (Si) made from optical grade silicon have become a popular product for applications in the 1.2-7μm spectral range due to their lower cost and density. Stanford Optics is adept at delivering Optical Products with both high purity and competitive pricing.
The Silicon Window (Si), manufactured from optical-grade silicon, has become a popular choice for applications within the 1.2 – 7 μm spectral range. Its widespread adoption is attributed to its lower cost and reduced density compared to alternatives like germanium and zinc selenide. With a density of just 2.329 g/cm³—approximately half that of germanium or zinc selenide—silicon is exceptionally well-suited for weight-sensitive applications, especially in the critical 3–5 μm range.
In addition to its lightweight properties, silicon boasts a Knoop hardness of 1,150, making it significantly harder than germanium. This increased hardness enhances its resistance to chipping and improves overall durability, ensuring reliable performance even in demanding environments. These attributes make the Silicon Window (Si) an excellent choice for high-performance optical systems where both cost-efficiency and material robustness are essential.
Infrared Imaging: Silicon windows are essential in infrared cameras, providing clear thermal images used in security surveillance, temperature monitoring, and various sensing applications.
Aerospace: In the aerospace industry, silicon windows are utilized to create lightweight and durable optical components for aircraft and spacecraft, contributing to weight reduction and improved fuel efficiency.
Automotive: Silicon windows enhance automotive night vision systems by improving vehicle visibility in low-light conditions, thereby increasing driver safety through better detection of obstacles and pedestrians at night.
Medical Devices: Silicon windows are employed in medical imaging equipment, such as infrared thermography devices, allowing for accurate temperature measurements and diagnostic imaging.
Industrial Monitoring: In industrial settings, silicon windows are used in thermal sensors and monitoring systems to ensure machinery operates within safe temperature ranges, preventing overheating and equipment failure.
Our Silicon Window (Si) is carefully handled during storage and transportation to preserve the quality of our product in its original condition.
Material |
Si |
Coefficient of Thermal Expansion CTE (10-6/℃) |
2.55 |
Edges |
Fine ground |
Knoop Hardness (kg/mm2) |
1150 |
Poisson’s Ratio |
0.265 |
Surface Flatness (P-V) |
2λ |
Wavelength Range (μm) |
1.2-7 |
Clear Aperture (%) |
85 |
Density (g/cm3) |
2.33 |
Melting Point (℃) |
1690 |
Index of Refraction |
3.422 @ 5µm |
Parallelism (arcmin) |
<3 |
Surface Quality |
40-20 |
Young’s Modulus (GPa) |
140 |
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