MiXran Meg1028 ZnSe Plano-Convex Lens
| Brand | MiXran |
|---|---|
| Model | Meg1028 |
| Material | Zinc Selenide (ZnSe) |
| Coating Options | Uncoated or Broadband AR Coating (IR2, Ravg < 1.5% @ 8–12 µm) |
| Diameter | 12.7 mm / 25.4 mm |
| Focal Lengths | 15–1000 mm |
| Surface Quality | 60–40 scratch-dig |
| Clear Aperture | ≥90% of diameter |
| Transmission Range | 0.5–20 µm (peak >70% @ 10.6 µm) |
| Damage Threshold | >500 MW/cm² (10 ns, 1064 nm) |
Overview
The MiXran Meg1028 ZnSe Plano-Convex Lens is a precision optical component engineered for demanding mid- to long-wave infrared (MWIR/LWIR) applications, particularly in CO₂ laser systems (10.6 µm), thermal imaging, FTIR spectroscopy, and gas sensing platforms. Fabricated from high-purity, CVD-grown zinc selenide (ZnSe), this lens exhibits exceptional transmission (>70% at 10.6 µm) and low absorption across the 0.5–20 µm spectral band. Its plano-convex geometry provides minimal spherical aberration when oriented with the convex surface facing the collimated input beam—a configuration recommended per ISO 10110-3 for optimal wavefront fidelity. The lens is available in two standard diameters (12.7 mm and 25.4 mm) and focal lengths ranging from 15 mm to 1000 mm, enabling integration into compact optical benches as well as large-aperture beam delivery systems.
Key Features
- High-transmission ZnSe substrate with certified bulk homogeneity and low scatter (<10 ppm RMS surface roughness)
- Optimized surface figure: λ/4 PV flatness on plano surface; λ/2 transmitted wavefront error (TWE) at 633 nm, verified via interferometric testing
- Two coating options: uncoated for maximum flexibility in custom thin-film deposition, or factory-applied IR2 broadband anti-reflection coating (Ravg < 1.5% over 8–12 µm)
- Rugged mechanical design: center thickness tolerance ±0.1 mm; edge thickness controlled to ±0.15 mm for repeatable mounting in kinematic lens holders
- Compliant with ISO 10110-1 (general tolerances), ISO 10110-2 (surface form), and ISO 10110-7 (surface imperfections)
- Traceable metrology: each lens includes a certificate of conformance with measured focal length (±0.5%), radius of curvature (±0.3%), and surface quality (60–40 scratch-dig per MIL-PRF-13830B)
Sample Compatibility & Compliance
The Meg1028 lens is compatible with standard SM-threaded lens mounts (e.g., Thorlabs SM1, SM2) and industry-standard kinematic cells (e.g., PN350xx-LM series). Its ZnSe material meets RoHS Directive 2011/65/EU and is free of restricted substances per IEC 63000. For regulated environments—including ISO/IEC 17025-accredited calibration labs and FDA-regulated medical laser OEMs—the lens supports full traceability through its unique product numbering system (e.g., PN35030-LM127-S, PN35019-LM254-S), enabling integration into documented change control and equipment qualification protocols (IQ/OQ/PQ). While not an active device, its use in Class IV laser systems requires adherence to ANSI Z136.1 safety standards; appropriate beam containment and alignment verification are mandatory prior to operation.
Software & Data Management
As a passive optical component, the Meg1028 does not incorporate embedded firmware or digital interfaces. However, its dimensional and optical specifications are fully parameterized for import into optical design software suites including Zemax OpticStudio, CODE V, and FRED. All published data—focal length, radius of curvature, center thickness, and coating performance curves—are provided in standardized .csv and .txt formats compatible with automated BOM generation and PLM systems (e.g., Siemens Teamcenter, PTC Windchill). Calibration reports include NIST-traceable reference measurements and uncertainty budgets compliant with ISO/IEC 17025 Clause 7.6.2.
Applications
- CO₂ laser beam focusing and collimation in material processing (cutting, welding, engraving)
- Objective and relay lenses in uncooled microbolometer-based thermal imaging modules
- Sample compartment optics in benchtop and portable FTIR spectrometers operating in the fingerprint region (600–4000 cm⁻¹)
- Gas cell windows and focusing elements in tunable diode laser absorption spectroscopy (TDLAS) systems targeting CH₄, CO₂, and N₂O lines near 8–12 µm
- Reference optics in radiometric calibration setups requiring known transmittance and wavefront stability under thermal cycling (−40°C to +80°C)
FAQ
What is the damage threshold for the Meg1028 lens under pulsed CO₂ laser irradiation?
The lens is rated for >15 J/cm² at 10.6 µm, 100 ns pulse width, 10 Hz repetition rate, measured per ISO 21254-2. Continuous-wave (CW) power handling exceeds 5 kW/cm² with adequate heat sinking.
Can the IR2 coating be applied post-purchase to an uncoated Meg1028 lens?
No—coating must be performed in a cleanroom environment immediately after polishing and before final cleaning. Re-coating risks substrate degradation and adhesion failure; only factory-coated units are warranted.
Is the focal length specified at 10.6 µm or visible wavelength?
All focal lengths are nominal values calculated at 10.6 µm using the manufacturer’s published refractive index (n = 2.399 @ 10.6 µm). Measured EFL tolerance is ±0.5% at operational wavelength.
Do you provide mounting adapters for non-standard lens cells?
Yes—custom machined retaining rings and kinematic mounts (e.g., Ø12.7 mm to SM1, Ø25.4 mm to C-mount) are available upon request with lead time and drawing submission.
Are test reports available for individual lenses prior to shipment?
Yes—interferometric wavefront maps, spectral transmittance curves (2–15 µm), and dimensional inspection reports are included digitally with every order. Physical hard copies require advance notice and may incur nominal documentation fees.
