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High transmission across mid- to far-infrared spectrum (0.5–20 µm), optimized for CO₂ laser systems (10.6 µm).
Low absorption coefficient and minimal thermal lensing under high-power IR irradiation.
Plano-concave geometry enables beam divergence control and optical path length adjustment in collimated systems.
Chemically stable, non-hygroscopic crystalline structure resistant to common industrial environments.
AR-coated options available (e.g., broadband 8–12 µm or laser-line 10.6 µm) to reduce surface reflection losses below 0.25% per surface.
Beam expansion and collimation in CO₂ laser cutting, welding, and marking systems.
FTIR spectrometer optics for sample compartment and detector-side beam shaping.
Infrared thermal imaging relay lenses requiring wide spectral throughput and low wavefront distortion.
Laser material processing optics where thermal stability and damage resistance are critical.
Quantum cascade laser (QCL) beam conditioning in gas sensing and spectroscopic instrumentation.
| Chemical Type | Zinc Selenide (ZnSe), synthetic polycrystalline |
| Product Form | Optical-grade plano-concave spherical lens (uncoated or AR-coated) |
| Appearance | Translucent orange-yellow, polished surfaces with λ/4 surface flatness (plano side) and λ/2 wavefront accuracy |
| Refractive Index (at 10.6 µm) | 2.403 |
| Transmission Range | 0.5–20 µm (peak >70% uncoated; >95% with AR coating at design wavelength) |
| Thermal Expansion Coefficient | 7.1 × 10⁻⁶ /°C (20–100 °C) |
| Primary Optical Function | Negative focal power for beam divergence, virtual image formation, and optical cavity tuning |
| Standard Coating Options | Uncoated, 10.6 µm V-coat (R < 0.2%), or broadband 8–12 µm AR coating |
| Common Compatible Systems | Suitability |
| CO₂ Laser Systems (e.g., Synrad, Coherent Diamond series) | Highly Recommended – Optimal transmission and damage threshold at 10.6 µm |
| FTIR Spectrometers (e.g., Thermo Nicolet iS50, Bruker Vertex 80v) | Recommended – Stable performance across 2–16 µm spectral range |
| QCL-Based Gas Analyzers (e.g., Block Engineering Q-Tune) | Suitable – Effective for 4–12 µm tuning ranges with optional broadband AR coating |
| Industrial IR Thermal Cameras (e.g., FLIR X-Series with custom optics) | Recommended – Low dispersion and high homogeneity support accurate radiometric calibration |
Q1: What is the CAS Number for ZnSe optical material?
A: The CAS Registry Number for zinc selenide (ZnSe) is 1315-09-9. Note: This applies to the bulk crystalline material; finished lenses are precision-machined optical components and not subject to chemical registration as substances.
Q2: Is ZnSe compatible with high-power pulsed lasers, and what is its typical laser-induced damage threshold (LIDT)?
A: Yes — ZnSe exhibits an LIDT of ≥500 MW/cm² for 10.6 µm, 10 ns pulses (tested per ISO 21254). Performance depends on surface quality, coating, and beam uniformity; uncoated lenses require careful handling to avoid contamination-related damage.
Q3: How does ZnSe compare to Ge (Germanium) and CaF₂ for IR lens applications?
A: ZnSe offers broader IR transmission than CaF₂ (which cuts off ~8 µm) and lower dispersion than Ge, while avoiding Ge’s strong temperature-dependent refractive index shift. Unlike Ge, ZnSe remains transparent at room temperature without cooling and has higher resistance to thermal shock.
Q4: Does ZnSe pose leaching or extractable risks in controlled environments such as cleanrooms or analytical instruments?
A: No — ZnSe is a covalently bonded, insoluble crystalline solid with negligible vapor pressure and no measurable leaching under ambient or vacuum conditions. It complies with ISO 14644-1 Class 5 cleanroom compatibility when properly cleaned and packaged.
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E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
