Zinc Selenide (ZnSe) plano-convex lenses optimized for CO₂ laser systems at 10.6µm. Exceptional infrared transmission from 0.6µm to 20µm with low absorption for high-power laser cutting, welding and medical applications.
| Material | Zinc Selenide (ZnSe), CVD grade |
| Transmission Range | 0.6 – 20 µm |
| Design Wavelength | 10.6 µm (CO₂ laser) |
| Diameter Range | 6mm – 75mm |
| Focal Length Range | 25mm – 500mm |
| Surface Quality | 40-20 / 20-10 (MIL-PRF-13830B) |
| Centration | < 3 arc min |
| Coating | AR @ 10.6µm, R < 0.2% per surface |
| Absorption | < 0.005/cm @ 10.6µm |
| Refractive Index | ~2.40 @ 10.6µm |
Select the optimal optical material based on your wavelength, power, thermal environment and mechanical requirements.
Coatings are engineered around your specific wavelength and operating conditions.
We optimize specifications to match your system requirements — not over-specify. Tighter tolerances increase cost without always improving system performance. Our engineers will work with you to identify which parameters actually matter for your application and where standard tolerances are sufficient. Typical manufacturing capabilities:
Every component undergoes 100% inspection before shipment. We provide full inspection documentation including interferometer reports, spectral transmission curves, surface quality images and dimensional measurement data. Equipment capabilities:
Thermal properties: ZnSe has relatively high thermal expansion (7.1 × 10⁻⁶/K) and dn/dT of 60 × 10⁻⁶/K. At high CO₂ laser powers (>1kW), thermal lensing becomes significant. Design your beam delivery with this in mind.
Handling: ZnSe is relatively soft (Mohs 4) and susceptible to scratching. Handle with care, use clean compressed air for cleaning rather than wiping. Avoid contact with acidic or alkaline solutions.
Meniscus vs plano-convex: For high-power CO₂ systems, meniscus lenses distribute heat more evenly and reduce thermal stress compared to plano-convex designs. Consider meniscus for powers above 2kW.
ZnSe is the standard for CO2 laser optics. This guide helps confirm it matches your wavelength and application.
| Your Requirement | Best Material | Why |
|---|---|---|
| CO2 laser (10.6um) | Znse ✓ | ZnSe is the industry standard for 10.6um CO2 laser optics. Transmits 0.6-18um. |
| Nd:YAG (1064nm) | Fused Silica | ZnSe can transmit at 1064nm but fused silica is more cost-effective for NIR laser focusing. |
| Fiber laser (1070nm) | Fused Silica | For fiber lasers, fused silica offers better performance and cost. |
| Your Requirement | Best Material | Why |
|---|---|---|
| Need visible alignment beam | Znse ✓ | ZnSe transmits visible red (> 600nm), allowing HeNe alignment through the optic. |
| No alignment beam needed | Germanium | If alignment is done with IR cameras, Ge is also an option for LWIR. |
| Your Requirement | Best Material | Why |
|---|---|---|
| Industrial workshop (dirty) | Znse ✓ | Specify DLC coating on ZnSe for industrial environments. Prevents contamination. |
| Cleanroom / lab | Znse ✓ | Standard AR coating is sufficient for controlled environments. |
The following documentation is available upon request for qualified engineering projects:
CAD & dimensional specs per your requirements
Material properties, transmission curves & certificates
Spectrophotometric measurement data
Surface quality, flatness, centration & dimensional data
CoC with full traceability per project requirements
Application-specific specification documentation
Documentation availability depends on project scope and order quantity. Request details during RFQ.
When requesting a quote for this product, please specify the following parameters to help our engineering team provide an accurate quotation:
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Contact us for exact pricing based on your specifications.
Specification Parameters
Typical Specifications shown on this page are standard capabilities. Available Options include alternative materials and coatings. Custom Specifications are available per your drawing. Requirements beyond standard capability are marked Subject to Engineering Review.
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