IR Beam Expansion & Divergence Control
ZnSe Plano-Concave Lens Ø25.4mm f=-25.4mm 7-12μm BBAR
Precision ZnSe plano-concave lens (Dia 25.4mm, f -25.4mm, 7-12μm BBAR). Ideal for thermal imaging & beam control. In-stock & ready to ship at iroptical.
Product Overview
Engineered for thermal imaging, FLIR systems, and CO2 laser beam management, this high-precision Zinc Selenide (ZnSe) plano-concave lens provides negative focal length (-25.4 mm) for effective beam expansion and focal length alteration. Featuring an IR2 broadband anti-reflection coating optimized for the 7–12 μm spectral range, it delivers superior power throughput, minimal thermal lensing, and exceptional wavefront quality for demanding optical assemblies.
Technical Specifications
| Material | Diameter (mm) | Focal Length f (mm) | Back Focal Length (mm) | Radius of Curvature (mm) | Center Thickness (mm) | Edge Thickness (mm) | Coating Range |
|---|---|---|---|---|---|---|---|
| CVD ZnSe | 25.4 (+0.0/-0.1) | -25.4 (±1%) | -26.23 | -35.63 | 2.0 (±0.2) | 4.30 | 7–12 μm IR2 BBAR |
| Design Wavelength | Clear Aperture | Surface Accuracy | Surface Quality | Centration | Bevel |
|---|---|---|---|---|---|
| 10.6 μm | > 80% | λ/2 @ 632.8 nm | 60-40 Scratch-Dig | < 3 arcmin | < 0.2 mm × 45° |
Applications & System Integration
Due to its low bulk absorption in the long-wave infrared (LWIR) spectrum, this negative lens is extensively utilized across advanced optical setups:
Optical Beam Expansion: Pairs seamlessly with positive optical elements to construct Galilean or Keplerian beam expanders for 10.6 μm CO2 laser systems.
Thermal Imaging & Sensing: Adjusts system focal length and corrects optical aberrations in spectral radiometry and LWIR imaging modules.
Collimation & Divergence Tuning: Offers predictable beam divergence control in laboratory research and industrial thermal inspection tools. Integrate with specialized ZnSe lenses and custom infrared optics to optimize overall transmission efficiency.
Customization & Quality Assurance
At iroptical, every optical element undergoes strict interferometric and spectral testing to guarantee world-class performance. In addition to our extensive in-stock optical inventory for immediate dispatch, we provide full-service custom fabrication—including custom dimensions, specific substrate grades, specialized wedge angles, and custom dielectric coatings tailored to your target wavelength ranges.
Technical Support & Direct Inquiries
Facing tight project deadlines or strict wavefront distortion tolerances? Our engineering team is ready to evaluate your optical design, assist with component selection, or provide tailored quotation parameters within 24 hours.
Contact our technical sales team at sales@iroptical.com or submit an inquiry through our platform today to discuss your technical requirements and secure reliable lead times.
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Technical Parameters
Detailed specifications are not available for this product yet. Please contact the team for application guidance.