Custom High Precision Optical Polished P Type Silicon Drilled Windows

Name: Custom High Precision Optical Polished P Type Silicon Drilled Windows
Brand: Henan UM Optics Ltd
Availability: InStock

Description

Silicon Drilled Windows are high-precision optical components fabricated from high-purity monocrystalline or polycrystalline silicon substrates. Characterized by a precisely machined drilled hole (aperture) on the silicon window surface, they integrate the excellent mid-to-far infrared transmission performance of silicon with the precise light-beam limiting/filtering function of the aperture. Designed for harsh optical environments and high-precision light path control, these windows serve as critical light-control elements in various infrared optical systems, ensuring stable light transmission while filtering out stray light or defining the beam path.

Specifications

Substrate Material:	Si
Antireflection Coating:	Uncoated
Diameter:	25.4 mm
Surface Quality:	60-40 scratch-dig
Surface Flatness:	lambda/4
Thickness:	2 mm
Dimension Tolerance:	+0/-0.1mm
Parallelism:	<3 arcmin
Bevel:	0.2 mm x 45°
Drilled Hole:	Custom

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Features

Excellent Infrared Transmission: Boasts superior transmittance in the1.2–15 μm mid-to-far infrared band, with low absorption loss, making it ideal for infrared optical system applications
Precision Drilling Process: The aperture size (diameter range: typically 0.1–50 mm) and position tolerance are strictly controlled (up to ±0.01 mm), ensuring accurate beam limiting and light path alignment
Superior Material Properties: High-purity silicon substrate offers good mechanical strength, thermal stability (operating temperature up to 600°C in inert atmosphere), and resistance to most chemical corrosion
Customizable Surface Treatment: Optional anti-reflection (AR) coating (optimized for specific infrared bands) to further enhance transmittance, or anti-scratch coating to improve surface durability
Diverse Substrate Options: Available in monocrystalline or polycrystalline silicon substrates to meet different requirements for optical uniformity and cost-effectiveness

Applications

Infrared Imaging Systems: Used in infrared thermal imagers, night vision devices, and thermal detection equipment to limit the beam diameter, reduce stray light interference, and improve imaging clarity and signal-to-noise ratio
Laser Systems: Applied in mid-infrared laser devices as beam apertures, ensuring precise beam shaping and protecting internal optical components from laser damage
Infrared Spectroscopy: Utilized in Fourier Transform Infrared (FTIR) spectrometers and infrared gas analyzers to define the light path, improve spectral measurement accuracy, and reduce background noise
Aerospace & Defense: Suitable for airborne infrared detection systems, missile guidance systems, and military night vision equipment, adapting to harsh working environments such as high temperature, low pressure, and vibration
Industrial Automation: Used in industrial thermal inspection equipment to control the detection light path and ensure measurement precision

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China

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Henan UM Optics Ltd

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since 2024

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Frequently Asked Questions

What is the difference between monocrystalline and polycrystalline silicon drilled windows?

Monocrystalline silicon drilled windows have higher optical uniformity and lower scattering loss, making them suitable for high-precision applications. Polycrystalline silicon drilled windows are more cost-effective with slightly lower uniformity, ideal for general industrial detection scenarios where ultra-high precision is not required.

Can the aperture size and shape of silicon drilled windows be customized?

Yes, UM Optics provides full customization services.

What is the maximum operating temperature of silicon drilled windows?

In an inert atmosphere (e.g., nitrogen, argon), the maximum operating temperature is up to 600°C. In air, it is recommended to use below 450°C to avoid oxidation of the silicon surface, which may affect optical performance.

Is anti-reflection coating necessary for silicon drilled windows?

It depends on the application scenario. If the system requires high transmittance, an AR coating optimized for the working band (e.g., 3–5 μm, 8–14 μm) is recommended. For general beam-limiting applications with low transmittance requirements, uncoated windows are sufficient.