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

Product Details Meets Severe Abrasion Requirements of MIL-F-48616 and MIL-C-48497C High Transmission from 3 – 5µm Ideal for Harsh Environments Diamond-Like Carbon (DLC) Coated Germanium Windows Also Available 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. Specifications General Model Number: DLC35-SI-W-38-2 Type: Protective Window Type of Window: Crystal Note: Arrow on substrate edge points towards DLC coated surface Physical & Mechanical Properties Clear Aperture CA (mm): 32.38 Diameter (mm): 38.10 +0.00/-0.13 Thickness (mm): 2.00 ±0.13 Parallelism (arcmin): <3 Bevel: Protective as needed Clear Aperture (%): 85 Edges: Fine Ground Poisson's Ratio: 0.27 Young's Modulus (GPa): 140 Knoop Hardness (kg/mm 2 ): 1,150.00 Optical Properties Coating: S1: DLC Coating S2: BBAR (3000-5000nm) Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More Silicon (Si) Index of Refraction (n d ): 3.422 @ 5µm Surface Quality: 40-20 Coating Specification: AR: R avg ≤0.5% @ 3000 - 5000nm Wavelength Range (nm): 3000 - 5000 Surface Flatness (P-V): λ/10 @ 10.6μm Coating Temperature (°F): AR: -80 to +160 per MIL-C-48497C
DLC: -80 to +160 per MIL-C-48497C Material Properties Density (g/cm 3 ): 2.33 Coefficient of Thermal Expansion CTE (10 -6 /°C): 2.55 Environmental & Durability Factors Coating Abrasion: AR: Moderate, per MIL-C-48497C
DLC: Severe, per MIL-C-48497C Coating Adhesion: AR: per MIL-C-48497C
DLC: per MIL-C-48497C Coating Humidity: AR: 24 Hours per MIL-C-48497C
DLC: 24 Hours per MIL-C-48497C Coating Salt Spray: AR: N/A
DLC: ≥72 Hours per MIL-C-675 Coating Salt Solubility: AR: N/A
DLC: ≥24 Hours Immersion per MIL-C-675C Coating Solubility and Cleaning: AR: per MIL-C-48497
DLC: per MIL-C-48497 Coating Wiper Durability: AR: N/A
DLC: ≥1,000 Wipes of Sand/Slurry per TS-1888 Regulatory Compliance RoHS 2015: Compliant × Certificate of Conformance: View × Reach 240: Compliant ×