Description
Product Specification
- Bevel: Protective as needed
- Clear Aperture CA (mm): –
- Clear Aperture (%): 90.00
- Thickness (mm): – ±0.1
- Diameter (mm): – +0.0/-0.1
- Coating Specification: R<sub>avg</sub> <3.0% @ 3-5µm
- Coating: BBAR (3000-5000nm)
- Density (g/cm³): 2.33
- Index of Refraction n<sub>d</sub>: 3.422 @ 5µm
- Coefficient of Thermal Expansion CTE (10⁻⁶/°C): 2.55
- Edges: Fine Ground
- Knoop Hardness (kg/mm²): 1150
- Parallelism (arcmin): <3
- Poisson’s Ratio: 0.265
- Substrate: Silicon (Si)
- Surface Flatness (P-V): 1λ
- Surface Quality: 60-40
- Type: Protective Window
- Wavelength Range (nm): 3000 – 5000
- Young’s Modulus (GPa): 140
Material and Optical Properties
- Mechanical Properties:
- Knoop Hardness: 1150, making silicon harder and less brittle than Germanium, thus providing enhanced durability and resistance to mechanical stress.
- Transmission Properties:
- Broad Transmission: Effective transmission from 1.2 µm to 7 µm, covering both NIR and MWIR regions.
- Enhanced Performance: The AR coating for 1.65 – 5 µm improves transmission efficiency and reduces surface reflections, crucial for high-performance IR systems.
- Cost and Availability:
- Low Cost: Silicon windows are cost-effective compared to other IR materials like Germanium and Zinc Selenide, making them popular for a variety of applications.
- Versatile Sizing: Available in diameters ranging from 10 mm to 76.20 mm, accommodating different application needs.
Applications
- Infrared Imaging:
- NIR and MWIR Imaging: Perfect for applications requiring high transmission in the 1.2 – 7 µm range, such as thermal imaging cameras and IR sensors.
- AR Coated Systems: Enhanced performance in the 1.65 – 5 µm range for critical imaging and sensing applications.
- Industrial Sensing:
- Weight-Sensitive Devices: Ideal for portable or airborne IR sensing equipment where minimizing weight is crucial.
- Environmental Monitoring: Used in sensors for environmental monitoring requiring durable and lightweight optical components.
- Aerospace and Defense:
- Surveillance and Reconnaissance: Suitable for aerospace and defense applications, providing reliable performance in weight-sensitive and harsh environments.
- Thermal Imaging Systems: Utilized in systems operating within the 1.65 – 5 µm range, especially those requiring enhanced transmission and durability.
- Scientific Research:
- Spectroscopy: Applied in spectroscopic instruments needing broad IR transmission and durable optics.
- General Research: Ideal for experiments and applications requiring robust and cost-effective IR window solutions.
Shape Optics Silicon (Si) Windows offer a cost-effective and versatile solution for a wide range of infrared applications, particularly in the NIR and MWIR regions. Their low density and high hardness make them suitable for weight-sensitive and durable applications, respectively. With options for uncoated and AR-coated windows, these silicon optics provide enhanced performance and reliability, making them a preferred choice for industrial, aerospace, defense, and scientific applications.
