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38.1mm Dia. x 2mm Thick, 3-5μm AR Coated & DLC Coated, ISP Optics Silicon (Si) Window | DLC35-SI-W-38-2

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Diamond-Like Carbon (DLC) Coated Silicon Windows

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Protective as needed
Clear Aperture (%):
Clear Aperture CA (mm):
Diameter (mm):
38.10 +0.00/-0.13
Thickness (mm):
2.00 ±0.13
S1: DLC Coating
S2: BBAR (3000-5000nm)
Coating Specification:
AR: Ravg ≤0.5% @ 3000 - 5000nm
Coefficient of Thermal Expansion CTE (10-6/°C):
Density (g/cm3):
Fine Ground
Index of Refraction nd:
3.422 @ 5µm
Knoop Hardness (kg/mm2):
Parallelism (arcmin):
Poisson's Ratio:
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Surface Flatness (P-V):
λ/10 @ 10.6μm
Surface Quality:
Protective Window
Wavelength Range (nm):
3000 - 5000
Young's Modulus (GPa):
Coating Abrasion:
AR: Moderate, per MIL-C-48497C<br/>DLC: Severe, per MIL-C-48497C
Coating Adhesion:
AR: per MIL-C-48497C<br/>DLC: per MIL-C-48497C
Coating Humidity:
AR: 24 Hours per MIL-C-48497C<BR/>DLC: 24 Hours per MIL-C-48497C
Coating Salt Solubility:
AR: N/A<br/>DLC: ≥24 Hours Immersion per MIL-C-675C
Coating Salt Spray:
AR: N/A<br/> DLC: ≥72 Hours per MIL-C-675
Coating Solubility and Cleaning:
AR: per MIL-C-48497<br/>DLC: per MIL-C-48497
Coating Temperature (°F):
AR: -80 to +160 per MIL-C-48497C<br/>DLC: -80 to +160 per MIL-C-48497C
Coating Wiper Durability:
AR: N/A<br/>DLC: ≥1,000 Wipes of Sand/Slurry per TS-1888
Arrow on substrate edge points towards DLC coated surface
Model Number:

Regulatory Compliance

RoHS 2015:
Certificate of Conformance:

Product Family Description

ISP Optics Diamond-Like Carbon (DLC) Coated Silicon Windows provide anti-reflection coating on one surface and a specially designed DLC coating on the other surface, making these windows highly durable and ideal for harsh environments. The DLC Coated surface is designed to withstand temperature cycling from -80 to +160°F, salt spray for a continuous period of 72 hours, and 1,000 wiper oscillations in a sand and slurry mixture. Further, these windows meet the MIL-F-48616 and MIL-C-48497C requirements for severe abrasion. Silicon features a Knoop Hardness of 1150 and low density, making it tougher than germanium substrates and suitable for weight-sensitive applications, respectively. ISP Optics Diamond-Like Carbon (DLC) Coated Silicon Windows are engineered for 3 to 5µm, making them ideal for infrared defense applications such as thermal imaging.

Technical Information

Coating Specifications
Specification AR Coating DLC Coating
Adhesion per MIL-C-48497C per MIL-C-48497C
Abrasion Moderate, per MIL-C-48497C Severe, per MIL-C-48497C
Humidity 24 Hours per MIL-C-48497C 24 Hours per MIL-C-48497C
Salt Solubility - ≥24 Hours Immersion per MIL-C-675C
Salt Spray - ≥72 Hours per MIL-C-675
Temperature (°F) -80 to +160 per MIL-C-48497C -80 to +160 per MIL-C-48497C
Solubility and Cleaning per MIL-C-48497 per MIL-C-48497
Wiper - ≥1,000 Wipes of Sand/Slurry per TS-1888
Coating Temperature (°F) -80 to +160 per MIL-C-48497C -80 to +160 per MIL-C-48497C