High-Performance Silicon (Si) Lens with IR Anti-Reflection Coating for MWIR Applications
Price:
by case
MOQ:
1
Delivery Time:
2-4 weeks
Brand:
ZMSH
Product Description
High-Performance Silicon (Si) Lens with IR Anti-Reflection Coating for MWIR Applications
Product Overview
Silicon (Si) lenses with IR anti-reflection (AR) coating are high-performance optical components designed for mid-wave and long-wave infrared optical systems. By combining optical-grade single crystal silicon with precisely engineered infrared AR coatings, these lenses significantly reduce surface reflection losses and enhance overall system transmission efficiency.
Silicon lenses are widely used in infrared imaging, thermal cameras, infrared sensing, and industrial inspection systems due to their excellent thermal stability, mechanical strength, and reliable infrared optical performance. With IR AR coating applied, silicon lenses provide improved contrast, higher signal-to-noise ratio, and superior optical efficiency in demanding infrared applications.
Infrared Optical Properties of Silicon
Silicon is a well-established infrared optical material with stable and high transmission in the 1.2-8 μm wavelength range, making it particularly suitable for 3-5 μm (MWIR) infrared applications.
Compared with other infrared materials, silicon lenses offer several important advantages:
- High mechanical strength and excellent durability
- Good thermal conductivity for efficient heat dissipation
- Lower density and lighter weight compared to germanium lenses
- Stable chemical properties suitable for harsh environments
- Mature manufacturing processes enabling high-precision polishing
These characteristics make silicon lenses an ideal choice for infrared systems requiring long-term stability and reliable performance.
Technical Specifications
| Parameter | Specification |
|---|---|
| Material | Optical Grade Single Crystal Silicon (Si) |
| Transmission Range | 1.2 - 8 μm |
| Typical Application Band | 3 - 5 μm (MWIR) |
| Optional Coating Band | 8 - 12 μm (LWIR), Custom IR Bands |
| Refractive Index | ~3.42 @ 3.9 μm |
| Lens Type | Plano-Convex / Bi-Convex / Plano-Concave / Bi-Concave |
| Surface Figure | ≤ λ/10 @ 3.39 μm (custom available) |
| Surface Quality | 60/40 or 40/20 (Scratch/Dig) |
| Diameter Tolerance | ±0.02 mm (custom available) |
| Center Thickness Tolerance | ±0.02 mm |
| Clear Aperture | ≥ 90% of Diameter |
| Surface Roughness | ≤ 5 nm RMS |
| AR Coating Type | Infrared Anti-Reflection (IR AR Coating) |
| Coating Design | Single-band or Multi-band IR AR |
| Average Reflectance (Ravg) | ≤ 1.0% per surface (design wavelength) |
| Coating Sides | Single-side or Double-side |
| Operating Temperature | -40 °C to +200 °C |
| Thermal Conductivity | ~150 W/m*K |
| Density | ~2.33 g/cm³ |
| Environmental Stability | Industrial Grade |
| Customization | Size, focal length, tolerances, coating available |
IR Anti-Reflection Coating Technology
Bare silicon surfaces have relatively high Fresnel reflection in the infrared region due to their high refractive index. To maximize infrared transmission, IR anti-reflection coatings are applied to the lens surfaces.
Key benefits of IR AR coating include:
- Significant reduction of surface reflection losses
- Increased total lens transmission efficiency
- Improved image contrast and system sensitivity
- Reduced stray light and optical interference
The IR AR coating can be optimized for specific wavelength ranges, including:
- 3-5 μm mid-wave infrared (MWIR)
- 8-12 μm long-wave infrared (LWIR)
- Custom-designed infrared wavelength bands
The coatings feature strong adhesion, good environmental resistance, and long-term stability, making them suitable for industrial-grade and high-reliability infrared optical systems.
Lens Types and Manufacturing Capabilities
We offer a wide range of silicon lenses with IR anti-reflection coating, including:
- Plano-convex, bi-convex, plano-concave, and bi-concave silicon lenses
- Spherical and custom aspherical silicon lenses
- Single-side or double-side IR AR coating
- High-precision optical polishing with excellent surface quality
- Tight control of focal length, thickness, and surface accuracy
Custom manufacturing is available to meet specific optical design requirements, including lens diameter, curvature, tolerance, and coating performance.
Typical Applications
Silicon lenses with IR AR coating are widely used in:
- Thermal imaging and infrared camera systems
- Infrared temperature measurement and sensing devices
- Industrial infrared inspection and monitoring
- Infrared spectroscopy and scientific research equipment
- High-power infrared laser and optical transmission systems
In these applications, silicon lenses with IR anti-reflection coating play a critical role in improving optical efficiency and system reliability.
Key Advantages
- High infrared transmission efficiency
- Excellent thermal and mechanical stability
- Optimized IR anti-reflection coating performance
- Reduced optical losses and improved imaging quality
- Custom design support and stable volume production
FAQ - Silicon (Si) Lens with IR Anti-Reflection Coating
1. What wavelength range is silicon suitable for in infrared applications?
Silicon lenses offer good infrared transmission in the 1.2-8 μm wavelength range and are most commonly used in the 3-5 μm (MWIR) band. Silicon is not recommended for visible or near-visible applications due to its low transmission in those regions.
2. Why is IR anti-reflection coating necessary for silicon lenses?
Silicon has a relatively high refractive index, which causes significant surface reflection on uncoated lenses. IR anti-reflection (AR) coating reduces these reflection losses, increases total transmission, and improves image contrast and signal-to-noise ratio in infrared optical systems.
3. What infrared wavelength bands can the AR coating be designed for?
The IR AR coating can be optimized for different wavelength ranges, including:
- 3-5 μm (MWIR)
- 8-12 μm (LWIR)
- Custom infrared wavelength bands upon request
Coating performance can be tailored to specific system requirements.
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Company
SHANGHAI FAMOUS TRADE CO.,LTD
Location
Room.1-1805,No.1079 Dianshanhu Road,Qingpu Area Shanghai city, China /201799
Contact Person
Wang