MiXran Meg1074 Silicon (Si) Planar Optical Window
| Brand | MiXran |
|---|---|
| Model | Meg1074 |
| Material | Single-Crystal Silicon (Si) |
| Surface Flatness | λ/4 @ 633 nm |
| Surface Quality | 20–10 scratch-dig |
| Clear Aperture | ≥90% of diameter |
| Thickness Tolerance | ±0.1 mm |
| Parallelism | <1 arcmin |
| AR Coating Options | Uncoated |
| Operating Temperature Range | –60 °C to +150 °C |
| Transmission Range | 1.2–7 µm (uncoated), enhanced in 3–5 µm band with IR1 coating |
| Damage Threshold | >5 J/cm² @ 1064 nm, 10 ns pulse |
Overview
The MiXran Meg1074 is a precision-engineered planar optical window fabricated from high-purity, single-crystal silicon (Si), optimized for mid-infrared (MIR) transmission applications. Unlike fused silica or BK7 windows, silicon exhibits exceptional transparency across the 1.2–7 µm spectral region—making it indispensable in thermal imaging systems, FTIR spectrometers, CO₂ laser beam delivery, and gas sensing platforms operating within the 3–5 µm atmospheric window. The Meg1074 leverages Czochralski-grown Si wafers with controlled oxygen and carbon impurity levels (<1 × 10¹⁶ cm⁻³), ensuring low absorption loss and high bulk homogeneity. Its planar geometry—combined with λ/4 surface flatness and <1 arcmin parallelism—is calibrated for minimal wavefront distortion in collimated beam paths, supporting demanding interferometric and metrology-grade setups.
Key Features
- Material specification compliant with SEMI F1–0212 standard for optical-grade silicon substrates
- Two coating variants: uncoated (for general MIR use) and IR1 broadband anti-reflection coating (Ravg < 1.5% over 3–5 µm)
- Tight dimensional tolerances: thickness ±0.1 mm, diameter tolerance ±0.05 mm for all standard sizes
- Surface quality rated to MIL-PRF-13830B 20–10 scratch-dig, verified via automated dark-field inspection
- Thermal expansion coefficient of 2.6 × 10⁻⁶ /°C enables stable performance in temperature-cycled environments
- Chemically inert in non-oxidizing atmospheres; compatible with vacuum bake-out up to 150 °C
Sample Compatibility & Compliance
The Meg1074 window is designed for integration into OEM optical subassemblies and laboratory-grade instrumentation requiring robust, repeatable transmission characteristics in the mid-IR. It meets mechanical and optical interface requirements for common lens mounts (e.g., SM1, SM2 threading adapters) and vacuum flange interfaces (CF, KF). While not certified to ISO 9001 at the component level, all units are traceably manufactured under MiXran’s documented quality control protocol—including spectral transmittance validation via PerkinElmer Lambda 950 UV/Vis/NIR spectrometer with liquid-nitrogen-cooled MCT detector (3–5 µm range). No RoHS exemptions apply; lead-free processing is standard.
Software & Data Management
As a passive optical component, the Meg1074 does not incorporate embedded firmware or digital interfaces. However, its spectral performance data—including measured transmittance curves, coating reflectance maps, and wavefront error reports—are delivered in standardized ASCII and CSV formats upon request. These datasets integrate seamlessly with Zemax OpticStudio, CODE V, and FRED optical design environments via importable .DAT or .TXT tables. For GMP-regulated installations (e.g., medical laser systems), full material certification (CoC), coating process logs, and batch-level spectral verification records are available under MiXran’s document control system (revision-controlled per ISO 13485 Annex A).
Applications
- Front-end protective windows for cooled MCT and InSb focal plane arrays in thermal cameras
- Beam exit ports in sealed CO₂ laser cavities (10.6 µm) and quantum cascade laser (QCL) systems
- Sample compartment windows in benchtop FTIR spectrometers with DTGS or MCT detectors
- Gas cell windows for tunable diode laser absorption spectroscopy (TDLAS) targeting CH₄, CO, NO, and N₂O lines near 3.3 µm and 4.5 µm
- Reference optics in Michelson and Fabry–Pérot interferometers operating in ambient or purged enclosures
FAQ
Is the Meg1074 suitable for high-power CW laser applications?
Yes—when used with the IR1 coating, it supports continuous-wave irradiance up to 1 kW/cm² at 3–5 µm wavelengths, provided beam uniformity exceeds 80% and cooling is maintained at substrate temperatures below 80 °C.
Can I specify custom diameters or thicknesses beyond the listed catalog sizes?
Custom geometries are available under MiXran’s engineering services program (lead time: 6–8 weeks); minimum order quantity applies for non-standard dimensions.
Does the IR1 coating survive repeated cleaning with IPA or acetone?
Yes—the ion-assisted e-beam deposited MgF₂/ZnS multilayer is abrasion-resistant and chemically stable against standard optical solvents when cleaned using Class 100 cleanroom protocols.
What is the typical lead time for stocked items?
Standard configurations (GW81-xxx series) ship within 3 business days from Beijing warehouse; international air freight options include DHL Express and FedEx Priority Overnight.
Are spectral measurement reports provided with each shipment?
Batch-level spectral validation reports are included by default; individual unit traceability with measured transmittance at five wavelength points (3.0, 3.5, 4.0, 4.5, 5.0 µm) is available as an optional add-on service.
