MiXran Meg1015 UV-Fused Silica Biconcave Lens
| Brand | MiXran |
|---|---|
| Model | Meg1015 |
| Material | Fused Silica (UV-Grade) |
| Coating Options | Uncoated or UV Broadband AR Coating (250–400 nm) |
| Diameter Range | 6.3 mm to 25.4 mm |
| Focal Length (EFL) | –6.3 mm to –100 mm |
| Surface Geometry | Symmetric Biconcave (R₁ = R₂) |
| Center Thickness (Tc) | 1.0 mm to 5.8 mm |
| Edge Thickness (Te) | 0.67 mm to 9.48 mm |
| Compliance | ISO 10110-1, MIL-O-13830A Surface Quality |
Overview
The MiXran Meg1015 is a precision-engineered UV-grade fused silica biconcave lens designed for demanding optical applications in the deep ultraviolet (DUV) through near-visible spectral range. Constructed from synthetic fused silica with high transmission (>90%) from 185 nm to 2.1 µm and exceptionally low hydroxyl (OH⁻) content (<1 ppm), this lens exhibits minimal thermal expansion (α ≈ 0.55 × 10⁻⁶ /°C), excellent homogeneity (Δn < 5 × 10⁻⁶), and superior resistance to solarization under prolonged UV exposure. Its symmetric biconcave geometry (R₁ = R₂) provides uniform wavefront divergence and predictable beam expansion characteristics—ideal for beam shaping, laser cavity design, optical isolation, and collimation correction in UV spectroscopy, lithography alignment systems, and fluorescence microscopy illumination paths. Unlike standard BK7 or N-BK7 lenses, the Meg1015 maintains high transmission and low absorption below 250 nm, making it suitable for applications where quartz-grade optical performance is mandatory.
Key Features
- UV-optimized fused silica substrate with certified transmittance ≥85% at 254 nm and ≥90% at 365 nm per 10 mm path length
- Two coating variants: uncoated for maximum UV reflectivity control or broadband anti-reflection (AR) coating optimized for 250–400 nm (Rₐᵥg < 0.5% per surface)
- Precision-polished surfaces meeting ISO 10110-1 surface quality specifications (scratch-dig 20–10 or better)
- Centering tolerance ≤ 3 arcmin; surface irregularity λ/4 @ 632.8 nm (verified via interferometry)
- Available in 11 standardized configurations—from Ø6.3 mm × EFL –6.3 mm to Ø25.4 mm × EFL –100 mm—with consistent edge and center thickness tolerances (±0.05 mm)
- Compatible with industry-standard lens mounts (e.g., SM-threaded cells, kinematic mounts) via matched mechanical drawings provided in datasheet
Sample Compatibility & Compliance
The Meg1015 complies with international optical manufacturing standards including ISO 10110-1 (optical element drawing notation), ISO 10110-7 (surface imperfection specification), and MIL-O-13830A (scratch-dig requirements). All lenses undergo full spectral transmittance validation using calibrated UV-VIS spectrophotometers traceable to NIST standards. Batch certification includes refractive index (nd = 1.45847 ± 0.0001 @ 587.6 nm), Abbe number (νd = 67.8), and thermal coefficient of refractive index (dn/dT = +1.1 × 10⁻⁶ /°C). No RoHS-restricted substances are used in substrate fabrication or coating deposition. Lenses are packaged in Class 100 cleanroom environments and shipped with individual calibration reports.
Software & Data Management
While the Meg1015 is a passive optical component, its geometric and material parameters are fully integrated into Zemax OpticStudio™, CODE V®, and FRED optical design libraries. Each product variant carries a unique PN (Part Number) conforming to MiXran’s traceability schema (e.g., PN35034-LM063-S10-10-10.67-9.48), enabling automated BOM generation, procurement tracking, and QC audit trails. Digital datasheets include STEP and SAT files for mechanical integration, as well as measured MTF curves and polarization-dependent loss (PDL) data for high-precision UV systems requiring polarization fidelity.
Applications
- Beam expansion and divergence control in excimer laser (193 nm, 248 nm) delivery optics
- Negative lens elements in UV-corrected doublet and triplet objectives for semiconductor inspection tools
- Field flattening and pupil relay in EUV metrology illuminators
- Attenuation and spatial filtering in Raman spectroscopy excitation paths
- Thermal-stable focusing elements in vacuum UV (VUV) photoelectron spectrometers (down to 121 nm)
- Custom relay optics for synchrotron beamlines operating in the 40–200 nm range
FAQ
Is the UV AR coating durable under high-power pulsed UV lasers?
Yes—the coating uses ion-assisted e-beam evaporation with SiO₂/Ta₂O₅ multilayer architecture, qualified for fluences up to 0.5 J/cm² at 248 nm (20 ns pulse width, 10 Hz rep rate) per ISO 21254-1.
Can I request custom focal lengths or non-standard diameters?
Custom geometries are available under MiXran’s OEM service program (minimum order quantity applies); lead time extends by 6–8 weeks for diamond-turned tooling and metrology validation.
Do you provide mounting hardware compatible with the Meg1015 series?
Yes—GL24-series SM-threaded lens cells (e.g., GL24-012-015) are designed specifically for Meg1015 dimensions and include adjustable retaining rings with 0.01 mm axial preload control.
Are certificates of conformance (CoC) and material test reports (MTR) included?
Each shipment includes a signed CoC referencing batch-specific transmittance spectra, surface flatness interferograms, and fused silica lot traceability back to the original ingot manufacturer.
What is the maximum operating temperature range for sustained UV exposure?
Continuous operation is rated from –40 °C to +80 °C; short-term exposure up to +120 °C is permissible if thermal gradients remain below 5 °C/min to avoid stress birefringence.
