MiXran Meg1072 ZnS CLEARTRAN™ Plane Optical Window
| Brand | MiXran |
|---|---|
| Model | Meg1072 |
| Material | Zinc Sulfide (ZnS), CLEARTRAN™ grade |
| Surface Quality | 60-40 scratch-dig |
| Surface Flatness | λ/4 @ 633 nm |
| Coating | Uncoated or Optional Broadband AR (Ravg < 1.5% @ 8–12 µm) |
| Diameter Options | Φ12.5 mm, Φ12.7 mm, Φ25.0 mm, Φ25.4 mm, Φ40.0 mm, Φ50.0 mm |
| Thickness Options | 2 mm, 3 mm |
| Transmission Range | 0.4–12 µm (typical for CLEARTRAN™ ZnS) |
| Operating Temperature | –40 °C to +200 °C |
| Compliance | RoHS-compliant, ISO 10110-1 optical manufacturing standard |
Overview
The MiXran Meg1072 ZnS CLEARTRAN™ Plane Optical Window is a precision-engineered infrared-transmitting optical component fabricated from high-purity, chemically vapor-deposited (CVD) zinc sulfide in the proprietary CLEARTRAN™ formulation. Unlike conventional ZnS, CLEARTRAN™ undergoes post-deposition thermal treatment to reduce scattering centers and achieve exceptional transmission across both visible and long-wave infrared (LWIR) spectral bands—specifically optimized for stable performance from 0.4 µm to 12 µm. Its near-zero porosity and homogeneity make it suitable for demanding applications in thermal imaging systems, FTIR spectrometers, CO₂ laser delivery optics, and environmental sensing platforms where spectral fidelity and thermal shock resistance are critical. The window is manufactured to ISO 10110-1 standards, with surface flatness maintained at λ/4 @ 633 nm and surface quality rated at 60–40 scratch-dig per MIL-PRF-13830B.
Key Features
- Material grade: CVD-grown CLEARTRAN™ ZnS—exhibits >70% average transmission over 8–12 µm without anti-reflection coating; >90% with optional broadband LWIR AR coating (Ravg < 1.5% across 8–12 µm)
- Thermal stability: Withstands continuous operation from –40 °C to +200 °C; coefficient of thermal expansion (CTE) of ~6.9 × 10–6 /°C ensures minimal focal shift under thermal cycling
- Mechanical robustness: Knoop hardness of ~180–200 HK; resistant to humidity-induced degradation unlike uncoated standard ZnS
- Dimensional consistency: Tight tolerance control on diameter (±0.05 mm) and thickness (±0.1 mm); edge geometry optimized for low-strain mounting in kinematic or elastomeric cell designs
- Optical homogeneity: Δn < 5 × 10–6 across aperture; negligible birefringence (< 10–7)—critical for polarimetric and interferometric applications
Sample Compatibility & Compliance
The Meg1072 window is compatible with standard optomechanical mounts including SM1 (1.035″-40), RMS (0.8″-36), and custom flange interfaces. It meets RoHS Directive 2011/65/EU requirements and conforms to ISO 10110-1 for surface form, ISO 10110-7 for surface imperfections, and ISO 9022-3 for environmental durability testing (including thermal shock and humidity exposure). While not inherently FDA- or IEC 61000-certified as a standalone component, its material properties and manufacturing traceability support integration into Class I and II medical or industrial systems requiring documented optical material compliance per ISO 13485 or IATF 16949 frameworks.
Software & Data Management
As a passive optical element, the Meg1072 requires no embedded firmware or driver software. However, its spectral transmission data (measured via PerkinElmer Lambda 950 UV/Vis/NIR and Bruker VERTEX 80v FTIR) is supplied in standardized ASCII format (.csv and .txt), fully compatible with optical design platforms including Zemax OpticStudio, CODE V, and FRED. Each shipped unit includes a Certificate of Conformance listing measured surface flatness, transmitted wavefront error (TWE), and spectral transmittance curves across 0.4–12 µm. Traceable calibration records adhere to ISO/IEC 17025:2017 guidelines when requested for GLP/GMP environments.
Applications
- LWIR thermal imaging windows for uncooled microbolometer cameras operating in the 8–14 µm atmospheric window
- Beam delivery optics in sealed CO₂ laser cavities (10.6 µm) requiring high damage threshold (>500 MW/cm² pulsed, >10 kW/cm² CW)
- FTIR spectrometer sample compartments and detector-side windows where minimal absorption artifact and low scatter are essential
- Environmental monitoring housings for open-path gas analyzers targeting CH₄, CO, NO₂, and SF₆ absorption lines between 3–12 µm
- Vacuum-compatible viewports for in-situ reaction monitoring in catalytic and plasma-enhanced CVD systems
FAQ
Is CLEARTRAN™ ZnS identical to standard CVD ZnS?
No. CLEARTRAN™ is a proprietary thermally annealed variant of CVD ZnS that reduces internal scattering and improves transmission in the visible range while retaining full LWIR performance.
Can the Meg1072 be used in vacuum environments?
Yes—CLEARTRAN™ ZnS exhibits negligible outgassing (per ASTM E595: TML < 0.05%, CVCM < 0.01%) and is routinely qualified for UHV applications up to 10–9 Torr.
What mounting recommendations minimize stress-induced birefringence?
Use low-stress kinematic mounts with compliant gaskets (e.g., indium wire or Viton O-rings); avoid overtightening—maximum recommended torque is 5 in-lb for SM1-threaded housings.
Is custom diameter or thickness available?
Yes. MiXran offers OEM fabrication services for non-standard dimensions, including wedged variants (≤3 arcmin) and substrate polishing to λ/10 flatness upon request.
Does the IR2 coating option affect laser-induced damage threshold (LIDT)?
The broadband AR coating maintains LIDT within ±10% of uncoated CLEARTRAN™ at 10.6 µm; certified LIDT data is provided per ISO 21254-1 for each coated batch.
