🔭 Optical Grade

Diamond Optical Windows

CVD diamond optical windows with broadband transmission from UV to far-infrared (0.22–2500 µm). The only single material that covers this entire spectral range — for CO₂ lasers, FLIR thermal imaging, synchrotron beamlines, and satellite sensors.

0.22–2500 µm
Transmission Range
n = 2.38
Refractive Index
AR Coated
Options Available
700°C
Max Operating Temp
Request a Quote Request Sample
Technical Specifications

Complete datasheet.

Transmission Spectrum Coverage
UV 0.22 µmVisibleNIRMIRLWIRFar-IR 2500 µm
Transmission Range0.22 – 2500 µm
Refractive Index (10 µm)n = 2.38
Absorption Coefficient<0.05 cm⁻¹ (mid-IR)
Surface Quality80/50 (scratch/dig)
Surface Roughness (Ra)<5 nm polished
Available Diameters5 mm to 75 mm
Thickness Range0.3 – 3.0 mm
Max Power Handling>100 kW/cm² (CW CO₂)
Max Operating Temperature700°C (in air)
Thermal Conductivity1,200 – 1,800 W/m·K
Coating OptionsAR (single/dual band), HR, uncoated
CharacterizationFTIR transmission, surface map, CoA
Use Cases

Where diamond sees further.

🔴
High-Power CO₂ Lasers
Diamond is the only window material rated for >100 kW/cm² CW operation at 10.6 µm. Used in industrial cutting, materials processing, and directed energy systems.
🛰
FLIR & Thermal Imaging
Diamond windows in LWIR camera systems (8–12 µm) provide unmatched mechanical durability for airborne and missile-seeker applications while outperforming ZnSe in transmission.
⚗️
Synchrotron Beamlines
Diamond is the premier beamline window material for hard X-ray and UV synchrotron sources — combining high transmission, low absorption, and extreme radiation hardness.
🛡
Aerospace Sensor Domes
Hardest natural material (10 Mohs) with chemical inertness and broad spectral transmission. Diamond sensor windows survive hypersonic reentry conditions no other optical material can.
Coating & Finish Options

Configured for your wavelength.

Standard
Uncoated
~71% transmission across broad spectrum. Lowest cost. For applications where reflection loss is acceptable or AR coating is applied in-house.
Most Popular
Single-Band AR
>99% transmission at target wavelength. Available for 1.06 µm, 2 µm, 10.6 µm, and 8–12 µm LWIR. Specify your wavelength at time of order.
Advanced
Dual-Band AR
Simultaneous AR coating for two wavelength bands. Ideal for multi-sensor payloads (e.g., 1064 nm + LWIR). Custom design per application.
High Reflectance
HR Mirror Coating
>99.9% reflectance at specified wavelength. Diamond substrate provides superior heat dissipation for high-power laser cavity mirrors.
Special
DLC Protective
Diamond-like carbon overcoat for additional hardness and chemical protection in harsh outdoor/aerospace environments. Slight transmission reduction.
Custom
Application-Specific
Share your spectral requirement and environmental conditions. Our optical engineering team will design the right coating stack for your application.
What Ships With Your Order

Optically certified.
Spec-confirmed.

Optical systems depend on component consistency. Every diamond window ships with full characterization to support your optical system integration and quality records.

✓
FTIR transmission spectrum measured at 5 points across the clear aperture
✓
Interferogram / wavefront map showing transmitted wavefront error (TWE)
✓
Surface quality report (scratch/dig per MIL-PRF-13830B)
✓
Dimensional report with diameter, thickness, and parallelism (wedge)
✓
Coating report with measured reflectance/transmission curves (if coated)
✓
Certificate of Analysis with material purity (sp³ content, nitrogen level)
Also From Karia

Related products.

Type IIa Flagship
Semiconductor Substrates
View Product →
Thermal Management
Diamond Heat Sinks & Spreaders
View Product →
Quantum Grade
Quantum Diamonds
View Product →
Get Started

Need precision optical diamond?

Request a quote for custom diamond optical windows or request a $1 sample to evaluate transmission in your system.

Request a Quote Try a $1 Sample View All Products

Ships within 3 weeks · Certificate of Analysis included · No minimum order