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High-Performance Silicon (Si) Lens with IR Anti-Reflection Coating for MWIR Applications

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Superconducting Thin Monocrystalline Substrate

High-Performance Silicon (Si) Lens with IR Anti-Reflection Coating for MWIR Applications

Brand Name:	ZMSH
MOQ:	1
Price:	by case
Packaging Details:	custom cartons
Payment Terms:	T/T

Detail Information

Product Description

Detail Information

Place of Origin:

China

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

Supply Ability:

By case

Highlight:

Silicon lens MWIR anti-reflection coating

Si lens infrared applications

High-performance IR coated silicon lens

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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products details

High-Performance Silicon (Si) Lens with IR Anti-Reflection Coating for MWIR Applications

Sapphire Substrate

Sapphire Optical Windows

Silicon Carbide Wafer

Sapphire Tube

Semiconductor Substrate

Synthetic Gem Stone

Ceramic Parts

Scientific Lab Equipment

Sapphire Crystal Watch Case

Wafer Carrier Box

Superconducting Thin Monocrystalline Substrate

Gallium Nitride Wafer

Sapphire Substrate

Sapphire Optical Windows

Silicon Carbide Wafer

Sapphire Tube

Semiconductor Substrate

Synthetic Gem Stone

Ceramic Parts

Scientific Lab Equipment

Sapphire Crystal Watch Case

Wafer Carrier Box

Superconducting Thin Monocrystalline Substrate

Gallium Nitride Wafer

High-Performance Silicon (Si) Lens with IR Anti-Reflection Coating for MWIR Applications

Silicon lens MWIR anti-reflection coating

Si lens infrared applications

High-performance IR coated silicon lens