DIASEMI™ Diamond Infrared Window with Advanced AR Coating

Product Overview

DIASEMI™ diamond infrared windows integrate ultra-high thermal conductivity CVD diamond substrates with proprietary multi-layer anti-reflection (AR) coatings. By combining high-index dielectric materials such as hafnium oxide (HfO2HfO_{2}HfO2) with Nd-doped rare-earth oxides, DIASEMI achieves superior optical transmission, environmental durability, and laser-grade reliability for demanding applications.

Designed for high-power infrared systems, DIASEMI windows significantly reduce Fresnel reflection losses inherent to diamond (n≈2.4n \approx 2.4n≈2.4), boosting transmission performance beyond conventional limits.

Key Features & Advantages

1. Ultra-High Infrared Transmission

• Optimized multilayer AR design (SiO₂ / Nd:Y₂O₃ / AlN / HfO₂)

• >90% single-side transmission @ 10 μm

• >80% double-side transmission (LWIR 8–12 μm)

• Broadband anti-reflection performance

2. Proprietary Nd-Doped Rare-Earth Engineering

• Nd:Y₂O₃ layer enables precise refractive index tuning

• Reduced surface roughness and scattering loss

• Improved film density and microstructural uniformity

• Enhanced coating stability under high-power irradiation

3. Extreme Thermal & Mechanical Stability

• Diamond thermal conductivity: up to 2000 W/m·K

• HfO₂ high-stability top layer resistant to:

• High temperature

• High humidity

• Radiation exposure

• AlN interlayer mitigates thermal stress and improves adhesion

4. Laser-Grade Reliability

• High laser damage threshold (LIDT)

• مقاومة ممتازة للتعب الحراري (thermal fatigue resistance)

• Stable performance under high power density conditions

5. Engineered Interface & Adhesion Control

• Graded refractive index transition

• Low residual stress (<300 MPa)

• Suppression of parasitic interfacial phases (e.g., unintended SiO₂ formation)

Technical Specifications

Manufacturing Process

• Diamond growth: MPCVD (Microwave Plasma CVD)

• Thin film deposition:

• RF magnetron sputtering

• Reactive sputtering (AlN)

• Precision control of:

• Oxygen partial pressure

• Film stoichiometry

• Interface cleanliness

Applications

• High-power infrared laser windows

• Directed energy systems

• Semiconductor laser packaging

• Infrared imaging & sensing

• Fusion and plasma diagnostics

• Harsh-environment optical systems

Why DIASEMI?

Unlike conventional AR coatings based on fluoride materials, DIASEMI’s oxide-based multilayer system offers:

• Superior durability in extreme environments

• Higher thermal and mechanical reliability

• Scalable manufacturing compatibility

• Customizable spectral design (MWIR / LWIR / broadband)

Customization Options

DIASEMI provides tailored solutions based on application requirements:

• Wavelength optimization (3–5 μm / 8–12 μm / broadband)

• Coating stack redesign (e.g., La, Nd co-doping)

• Double-side AR coatings

• Metallization or bonding-ready backside

• Custom shapes and sizes

In Diamond material we trust DIASEMI

DIASEMI™ diamond infrared windows leverage advanced AR coating engineering—featuring HfO2HfO_{2}HfO2, Nd-doped rare-earth oxides, and stress-managed interfaces—to deliver industry-leading optical transmission, durability, and reliability.

They are an enabling technology for next-generation high-power optical and thermal management systems.